Flat Slab Load Transfer

Three types of loads are to be considered for the design of slabs: Dead load of the slab; Live load of the slab. continuous portion of the slab is found to be the key geometrical factor influencing heat transfer through the slab, particularly for the thin portion of the slab. , investigation of the seismic performance of PT slab-column connections and the development of seismic. The load that is supported by the slabs is transferred to the beams that span perpendicular to the slabs. Flat Plate-slab reinforced in two or more directions and supported by columns without beams or girders. SHEAR DESIGN IN FLAT PLATES AND FLAT SLABS When two-way slabs are supported directly by columns, as in flat slabs and flat plates, or when slabs carry concentrated loads, as in footings, shear near the columns is of critical importance. Columns and deck not designed to resist longitudinal bending (very flexible). Re: Max Load Possible for Slab? 03/08/2011 12:14 PM The 7" slab was a little confusing since I have only used a 7" thick slab under heavy machinery with average to poor soil; ex. Often difficult to drill into these floors for pipes. Flat Slab For short span lengths and light distributed weight (e. Able to carry heavier loads and span longer than ribbed slabs. This transferred moment increases the shear forces at the face of the column. Beamless slabs are supported only on columns and are applied mostly in large industrial and public buildings. ratio should not be more than 1. usually one and two-way spanning slabs • Punching shear –e. frame models (model1, 2, 3) and flat slab with drop models. Ingeniously designed details ensure a long service life. Hanson Senior Development Engineer Structural Development Section Research and Development Laboratories Portland Cement Association SYNOPSIS The strength of flat slabs near columns was investi-. to transfer lateral loads to shearwalls • Interior partitions (excluding center bearing wall) are dead loads only • The gypsum board inside is dead load • Interior walls not used to resist horizontal forces from wind. The heavy loads create the diagonal shear in the slab and also create a negative bending moment on columns, so the thickness of RCC slab under the column should be thickened. The slab has smooth under surfaces without column capitals or drop panels, shown in Figure 2. This type of two-way slabs is suited for light loads associated with apartment construction and can be economically used for. Transfer slab in the context discussed here is a level at which a column or wall bears on a beam or bare slab, directly below which there is no column or wall. slabs with a flat slab with drop panels regarding different load applications. The continuation of a small percentage of deformed reinforcement (0. Flat slabs are used for higher load conditions, typically superimposed loads greater than 100 psf (4. whe els tangent to an interiorjoint where the two these loads because environmentally imposed slab s are tied together are less severe than a free stresses must also be accounted for when ed ge because of the load transfer across the two considering stationary loads. The vertical shores under floors 4, 5, and 6 are reshores to distribute the 7th floor concrete construction loads to floors 3, 4, and 5. The automatic load combinations created for design by Eurocode 2-2004 now include snow loads when these are present in the model. El-Shihy, H. Comparison of calculation of axial loads on columns by tributary area method and 3D modeling by SAP2000 Imad Adel Ahmad Al-Qasem, Mohanad Yaseen Abdulwahid International Journal of Civil and Structural Engineering Volume 3 Issue 2 2012 337 BUILDING. Economic Concrete Frame Elements to Eurocode 2 Pictorial index ii Symbols iv 1 Introduction 1 2 Using the charts and data 2 3 In-situ concrete construction 24 3. In order to transfer the Column loads and the supporting solid, shallow and deep foundations are used. 00 kN/m2 and uniformly distributed live load of 5 kN/m2. com for more including a great breadth practice exam! Go here to get the exam directly!. 4 Slabs Spanning in Two Directions at RightAngles 24. The tendon install provide a suspension system within the slab and the simple balancing load were used. The load that is supported by the slabs is transferred to the beams that span perpendicular to the slabs. Assuming that the slab soffit is flat, to limit the total slab thickness for the floor adjacent to the bathroom, it is encouraged to limit to only one drop of 50mm at the wet areas. com In multifamily residential structures, a concrete Podium Slab typically acts as both a structural floor and as a transfer slab for wood and light gauge steel framed. Check resistance to moment transfer from column to slab BS EN 1992-1-1 Annex 1 1. A standard plate is a planar 2D member with an arbitrary number of edges that may be straight or curved. When the connections have been poorly constructed, this is not possible, and the lateral load path may be incomplete. Structure 1: Flat Slab 125mm. waffle slab, and two-way slab with beams. The ductility at failure is significantly increased. the absence of deep beams, flat slab structural system is significantly more flexible for lateral loads. However no research had been made to aid the understanding of the load transfer mechanism between the reinforced concrete ribbed slabs and their supporting columns. C Flat Slab construction is Rs. Such a grid of beams reduces the span of the slab and thus permits the designer to reduce the slab thickness. conventional slab, flat slab without drop, flat slab with drop, flat slab with column head, and flat slab with both drop and column head. 24 SOLID SLABS 24. The use of flat plate system will be checked. Hanson Senior Development Engineer Structural Development Section Research and Development Laboratories Portland Cement Association SYNOPSIS The strength of flat slabs near columns was investi-. Negative bending moments. ) are not present, the lateral load path depends on the ability of the slab-column connections to transfer bending moments. to lower, already completed, fl oor slabs. COMPARATIVE STUDY OF SEISMIC PERFORMANCE AND ECONOMICAL ASPECT OF WAFFLE SLAB AND FLAT SLAB. 24 SOLID SLABS 24. 2 SlabsContinuous OverSupports 24. Of these, the column is the most important, as it is the primary load-carrying element of the building. Sustained load combination: 1. Compared with tubular steel slab props, the aluminium MULTIPROP carries significantly higher loads whilst, at the same time, has a very low dead weight. The cost analysis of the post tensioned and RCC flat slabs are calculated and compared, based on the comparisons the conclusions are drawn. Transferring the loads from one framing layout to a different one. adjace nt slabs. In many high-rise hotel and office buildings, large column-free lobbies are required at ground level - often extending over several floors - while the hotel or office floors above have columns and walls at much closer spacing. 4 Slabs Spanning in Two Directions at RightAngles 24. A load bearing wall is a wall that bears a load resting upon it by conducting its weight to a foundation structure. Diamond™ Dowels are designed as a fast fix system that provides load transfer across the joint and minimises differential deflection between adjacent. INCREASING POPULARITY The growth in the use of CCL Post-Tensioned Slabs. Results of nine NSC. 1 SCOPE This chapter specifies the minimum design forces including dead load, live load, wind and earthquake loads, miscellaneous loads and their various combinations. For light loads. None of the results in that data set, however, are for post-tensioned (PT) slab-column connections. Ribbed slabs are suitable for medium to heavy loads, can span reasonable distances, are very stiff and particularly suitable where the soffit is exposed. and avoid beam below wall line load. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. Their lack of resistance to lateral loads is the main disadvantage of Flat plates or Flat slab. loads immediately after stressing. Determination of Hyper Static Moments in Post-Tensioned Concrete Flat Slab. It is used to transfer the floor loads to the support post and pillars Apprécier (1) Déprécier (0) Réponses (1). Shehab , Ahmed S. Answer: Load which is applied to membrane objects transfers directly to supporting structural objects, whereas meshed shell objects have bending stiffness and therefore resist a portion of the load through flexural deformation. Assuming that the slab soffit is flat, to limit the total slab thickness for the floor adjacent to the bathroom, it is encouraged to limit to only one drop of 50mm at the wet areas. Without the aid of beams, solid concrete slabs of uniform depths called flat plates are transfer loads directly to the supporting columns. 3 Figure 2 shows a typical flat slab floor with four supporting columns. As expected shear is the critical issue in most areas. Seismic Behaviour of Reinforced Concrete Framed Structure with this may be called as beam slab load transfer flat-slab structures are in the same range as for. Flat slabs means A concrete slab which is reinforced in two or more directions, usually without beams or girders to. The results provide valuable information on the load transfer mechanisms in a flat slab-column structure when critical columns are removed. Steel-reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving (see below). Flat Slabs: The Conventional method of construction that is a common practice is to support slab by beam; and beam supported by column. development of high rise structures in the United States when the first systems to transfer loads between concrete columns and flat slabs were patented [1,2]. com for more including a great breadth practice exam! Go here to get the exam directly!. Using FE transfer of load (which in this case is the best thing to do I guess) what way of modelling is to be preferred? 1 slab for the whole floor or one slab for each panel? In the case of a column supporting a slab is it the right choice to add emitters?. Usually, some empirical values are used as optimum rebar percentage to evaluate the economy of certain design. 3 Slabs Monolithic with Supports 24. 1 Introduction A flat plate is generally considered to be a thin flat component that is subjected to load conditions that cause deflections transverse of the plate. The beams reduce the available net clear ceiling height. 6 qk) l is the effective span. The flat slab type of construction provides architectural flexibility,. 7 Concrete. It is also the most economical of all slab systems because of simple formwork and placement of reinforcement We can distinguish between two types: Flat Plate and Flat Slab Flat-plates are economical up to spans of 26 feet (8 m. The BS 8110-97 equation is effective for interior column slab connections with moment transfer. A properly designed slab will allow equipment to travel across the surface and joints with minimal impact to the slab or the equipment itself. Introduction Because reinforced concrete flat plate structures do not contain beams, they are able to transfer all the loads acting on slabs directly to the columns. One-way slabs:. 7: Try to Avoid secondary beams, i. Flat slabs also offer flexibility where light and heavy partitions may be placed freely anywhere on plan. Alternatively, you can roll the slabs directly onto a board and keep them there, flat, until they can be slid off. Hanson Senior Development Engineer Structural Development Section Research and Development Laboratories Portland Cement Association SYNOPSIS The strength of flat slabs near columns was investi-. It is very rarely used today for large buildings, but smaller residential-scale structures are being built. The transfer is made by both flexure and eccentric shear, the latter being located at a distance of about. 7 of BS 8110, the simplified method can be used for flat slabs that the lateral stability is not dependent on the slab and columns provided that the following conditions are met; (1) The slab is loaded with a single load case of all the panels loaded with maximum ultimate load. 1971-NY World’s Fair Waffle Slab Tests- with DM ACI Journal –Oct. The problem of calculating transient heat transfer in concrete floor slabs is complicated due to ground coupling, which can require the numerical solution of two or three-dimensional transient conduction equations. Two-Way Flat Plate Concrete Floor System Analysis and Design. MULTIPROP slab props are made of aluminium which means they are very light, e. Elastic behavior, yield-line mechanisms, and compressive and tensile membrane actions in the flat slab-column structure were observed during the collapse tests. punching shear and avoid triggering of progressive collapse. mining dump trucks, front loaders, etc. transfer from slab to column is practically always present in flat slabs. adjace nt slabs. This can be used when columns are positioned at equal distance with equal loads distributed on the foundation. The influence is manifested by a diminished stress transfer capacity. The flat slab type of construction provides architectural flexibility,. Sika load transferring products have long been known as products to improve concrete joint performance, including joints in slabs. Follow the load path to the ground, determine what portion of the building is being supported by each column. 1 INTRODUCTION 2. (HSC) flat plate slabs. 2 Creep and Shrinkage 3. " do you mean it varies between floors? Because all you need to care about for the numerical design of a transfer floor is the vertical loads coming down onto it. system, the flat slab system is suitable for higher loads and larger spans, because of enhanced capacity in resisting shear and hogging moments near the supports. ICE Virtual Library essential engineering knowledge. However, in the event of loss of primarily load-carrying system, the potential for progressive collapse is relatively high. The mesh discretization of the slab used in ELS is shown in Fig. 5D model comprising two­ span frame and floor slab stripe with two-floor height. But the floating column rests on the beam. Flab slabs: Slabs of uniform thickness bending and reinforced in two directions and supported directly by columns without beams. Easy to Install. Aluminium slab props – low weight with high load capacity. The slab thickness varies from 125 mm to 300 mm for spans of 4 to 9m. 8 Flat Plate Analysis 8. Shah2 1Department of Civil Engineering, Ariel University Center of Samaria, Ariel, Israel 2Specialty Units for Safety and Preservation of Structures, College of Engineering, King Saud University, Kingdom of Saudi Arabia Abstract. Below are the types of concrete slabs. A new type of short-span bridge system for traversing wetlands and shallow waters (i. Abstract— Conventional slab, flat slab and grid slab is compared its seismic behavior for an unsymmetrical plan using response spectrum method with the help of software ETABS. Among all specimens, the slabs with circular shape of patch area exhibited the best performance in terms of ductility and splitting failure. The structures were located in seismic zone II, zone III, zone IV, and zone V with soil type II. A tapered load plate transfers loads across a joint between adjacent concrete floor slabs. Loads and Load Analysis Distribution of Dead Loads to Framed Floor Systems • Many floor systems consist of reinforced concrete slab supported on a grid of beams, • We need to understand how to transfer the load from the slab to the beams, • For Case 1: • It is a square floor system, • The edge beams support the same triangular load,. The principle of designing post-tensioning flat slab is based on the parabolic tendon profile which. Adin Faculty of Civil Engineering and National Building Research Institute, Technion - Israel Institute of Technology, Haifa - 32000, Israel (Received April 1991; revised version accepted December 1991) The results of an analytical study examining the behavior and load transfer. To investigate this phenomenon, a total of six flat slabs were tested with normal concrete, varying eccentricities of the loading: zero, one-half and one time the column dimensions (0, 0. Their lack of resistance to lateral loads is the main disadvantage of Flat plates or Flat slab. Hence slabs above, as horizontal surfaces, are irrelevant; as are the spans. DESIGN OF FLAT SLABS 1. Flat slabs with drop panel: Flat slab thickness at its column supports with column capitals or drop panels to increase strength. 5 Loads on Supporting Beams 25 COMPRESSION MEMBERS 25. 1 shows a reinforced concrete slab subjected to a single concentrated load at its center [Ref. 3 Slenderness Limits for Columns 25. 15 2-2 2-4. Post-tensioning stress checks are performed for transfer, final, and long term conditions. • Analysis of Flat Slab F is the total design ultimate load on the strip of slab between adjacent columns considered (1. However, the minimum thickness of a flat slab floor ≥ 125mm. Solutions for Transfer/Podium Slabs Prestressed Hollowcore floor members offer a distinct advantage over other traditional slab materials for the following reasons: www. Results of nine NSC. 2(5) Further guidance is given in Concrete Society Technical Report No 64: Guide to the Design and Construction of Reinforced Concrete Flat Slabs. Flat Slab: Load Path -Gravity loads imposed on and transferred to flat slabs -Loads carried floor by floor from slabs to nearest columns / core walls in. Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. A load bearing wall is a wall that bears a load resting upon it by conducting its weight to a foundation structure. The transfer is made by both flexure and eccentric shear, the latter being located at a distance of about. If it's easier, you can think of the structure as two structure on top of one another. transfer analysis of composite slabs against experimental measurements available in the literature, and to conduct a parametric study using the validated model to systematically investigate the influence of various parameters on the thermal performance of composite slabs. The floating column acts as a point load on the beam and this beam transfers the load to the columns below it. The loads of the filigree flat slab are transferred to the columns via 8'-0" wide conventionally reinforced in-slab beams that run 32'-0" x 16'-0" bays, typically. EQ load - externally applied h. It consists of uniform slabs 5 to 8 inches thick, rigidly connected to columns. Abstract— Conventional slab, flat slab and grid slab is compared its seismic behavior for an unsymmetrical plan using response spectrum method with the help of software ETABS. flat-slabs have been used since the mid (1900s) and are one of the most common floor systems employed in the construction of many multi- story buildings such as offices, hotels, and apartments throughout the world [5]. This article presents various aspects of these structural members for instance their function, types of loads imposed on them, and load transfer mechanism from one member to another one. adjace nt slabs. However, it is interesting to note that not much work has been done in India. Introduction Because reinforced concrete flat plate structures do not contain beams, they are able to transfer all the loads acting on slabs directly to the columns. In some cases, the section of column at top, as it meets the floor slab or a drop panel, is enlarged. In high-rise buildings, mat-slab foundations can be several meters thick, with extensive reinforcing to ensure relatively uniform load transfer. This fib Bulletin reviews the development of design models and theoretical analyses since the CEB Bulletin 168 Punching Shear in Reinforced Concrete - State-of-the-Art Report published. It has been transferred as triangular & TRAPEZOIDAL WAY load ditribution to column for 2way slab where as in one way slab is rectangular way distribtution in columns. However, steel plates (dowel) are used at certain intervals for the transfer of vertical loads and the transfer of loads for larger joint spacings. 5 Loads on Supporting Beams 25 COMPRESSION MEMBERS 25. loads immediately after stressing. The industry standard for construction joints, the Diamond Dowel® System achieves superior joint stability measurements of 0. In the present work six number of conventional RC frame and Flat Slab buildings of G+3, G+8, and G+12 storey building models are considered. Predictions of the connection response were calculated using a professional finite element computer program, utilizing three-dimensional, elasto-plastic, concrete elements. " do you mean it varies between floors? Because all you need to care about for the numerical design of a transfer floor is the vertical loads coming down onto it. But the floating column rests on the beam. Often difficult to drill into these floors for pipes. In a similar fashion, an equivalent thickness for a. The building is located in seismic zone III on a site with medium soil. The story about the design of a steel framed hotel, which cloned a flat slab system in steel, left a lasting impression. Flat slabs also offer flexibility where light and heavy partitions may be placed freely anywhere on plan. Some Important links for design of RC elements: Design of RC isolated. The base of the beams are formed using. Flat slabs are being used mainly in office buildings due to reduced formwork costs, fast execution and easy installation. Unsteady State Heat Transfer. Without the aid of beams, solid concrete slabs of uniform depths called flat plates are transfer loads directly to the supporting columns. This works with slab rollers like the Brent where the clay stays stationary and the roller moves across it. Best Practices for Concrete Slab Design Using Revit® Structure Florian Aalami - ADAPT Corporation SE 100-3 Intended for structural engineers using Revit Structure (RST), this class will equip you with the skills needed to carry out detailed designs of c oncrete slab and foundation models using ADAPT® software. The first example, is a "flat slab" of span (5 by 5) m and the other is of. A finite element model may be created to analyse a complicated loading arrangement. Unbonded or bonded topping over base slab for commercial or non-industrial buildings where construction type or schedule dictates: Base Slab - gooduniform level surface, curing Unbonded topping- bondbreaker on base slab, min thickness 3 in. Kalaiyarasi. 9: Convert wall line load in to UDL as w ÷ (0. Using FE transfer of load (which in this case is the best thing to do I guess) what way of modelling is to be preferred? 1 slab for the whole floor or one slab for each panel? In the case of a column supporting a slab is it the right choice to add emitters?. the estimate of slab thickness, h (Ref. The loads of the filigree flat slab are transferred to the columns via 8'-0" wide conventionally reinforced in-slab beams that run 32'-0" x 16'-0" bays, typically. Flat slab is defined as one sided or two-sided support system with sheer load of the slab being concentrated on the supporting columns and a square slab called 'drop panels'. Consequently the design procedure for the shear transfer. The tendon install provide a suspension system within the slab and the simple balancing load were used. The slab has smooth under surfaces without column capitals or drop panels, shown in Figure 2. waffle slab, and two-way slab with beams. Two-way slab action is assumed in a ribbed floor made of the double-tee section (precast), in the ribbed floor with integral beams, and also in hollow-block or hollow-cored slabs. Transfer Wagon for packs of slabs The HERSEN Transfer Wagon for packs of slabs (Ref. 4 Fire Resistance of Flat Plate Voided Concrete Slab Systems [ETN-B-2-16] length, the equivalent thickness shall be permitted to be obtained by dividing the net cross-sectional area of the slab including grout in the joints, by its width (see IBC Section 722. The disadvantage is that the forming can be more difficult. Their lack of resistance to lateral loads is the main disadvantage of Flat plates or Flat slab. The behavior of this type of structural system under gravitational loads is well established. The problem of calculating transient heat transfer in concrete floor slabs is complicated due to ground coupling, which can require the numerical solution of two or three-dimensional transient conduction equations. Structure 2: Flat Slab 150mm. C frame model, the time period is more for flat slab model than conventional frame since the conventional RC frame is stiffer than the flat slab model. Two-way slab action is assumed in a ribbed floor made of the double-tee section (precast), in the ribbed floor with integral beams, and also in hollow-block or hollow-cored slabs. Once the lateral forces reach the shear walls, they will act as point loads on the shear walls. Such a grid of beams reduces the span of the slab and thus permits the designer to reduce the slab thickness. well, the behaviour of the flat slab column connection zone. Today, the most commonly used slab systems used for multi-storied buildings are Flat plates. Aggregate interlock is not a viable technique for load transfer when heavy material handling vehicles are used. Easy to Install. Properly designed flat slabs possess considerable ability to transfer vertical loads through membrane action. Farhey, David Z. Without the aid of beams, solid concrete slabs of uniform depths called flat plates are transfer loads directly to the supporting columns. In the comparison of the conventional R. Among the various floor systems, the flat slab system is the one with the highest dead load per unit area. Calculators for structural engineers, construction professionals and steel building specifiers. LOAD TRANSFER PLATE FOR IN SITU CONCRETE SLABS TECHNICAL FIELD This invention relates generally to transferring loads between adjacent cast-in-place slabs and more particularly to a system for transferring, across a joint between a first slab and a second slab, a load applied to either slab. Determination of Hyper Static Moments in Post-Tensioned Concrete Flat Slab. 0 The locations of snow loading and drift on the structure can be seen in the load keys in the drawing documents. Slab load transfer to the beams and then in to the columns. The simplified arrangement assumes this to be about 0. The objective function is to come on the proper method of selecting the slab forms on variable span. The two-way flat slabs are more suitable for the bigger loads, and spans compare to the flat plates. 5 in Table 3. The objective function is to come on the proper method of selecting the slab forms on variable span. Hence, the masonry walls do not have to thick. INELASTIC DYNAMIC ANALYSIS OF FLAT SLAB-SHEAR WALL BUILDING By SUDHIR L. 00 kN/m2 and uniformly distributed live load of 5 kN/m2. Shear and Moment Transfer Between Concrete Slabs and Columns By Norman W. 2 Effective Length ofCompression Members 25. the absence of deep beams, flat slab structural system is significantly more flexible for lateral loads. The research is limited to flat plates where the design of slabs is governed by gravity loads and the slabs are supported on square columns without using any shear reinforcement. Flat slabs are solid concrete slabs that transfer the load directly to columns of uniform thickness. $\begingroup$ A presence of a transfer slab doesn't really have any special affect on your calculation of column tributary area. It can be formed into panels to better accommodate shrinkage and thermal movement and the panels will normally be attached by joints to allow for load transfer. Transfer Wagon for packs of slabs The HERSEN Transfer Wagon for packs of slabs (Ref. Openings can be easily accommodated – eliminates the requirement for trimmer beams. A properly designed slab will allow equipment to travel across the surface and joints with minimal impact to the slab or the equipment itself. 9: Convert wall line load in to UDL as w ч (0. 1 Definitions 25. With a length of 8 metres. INCREASING POPULARITY The growth in the use of CCL Post-Tensioned Slabs. However, treating the transfer slab independently and ignoring the rest of the structure is a more conservative analytical approach. Strengthening of Cutouts in Existing One-Way Spanning R. Ribbed slabs are suitable for medium to heavy loads, can span reasonable distances, are very stiff and particularly suitable where the soffit is exposed. Abstract— Conventional slab, flat slab and grid slab is compared its seismic behavior for an unsymmetrical plan using response spectrum method with the help of software ETABS. solid flat slabs, are compared regarding their performance in a range of criteria. 2(5) Further guidance is given in Concrete Society Technical Report No 64: Guide to the Design and Construction of Reinforced Concrete Flat Slabs. 3 Columns Internal, edge and corner columns 72. The term typical concrete slabs for this blog refers to concrete floor slabs-on-ground that do not transmit vertical loads or lateral forces from other parts of the structure to the soil. the transfer of loads to the supports. 3 of ACI 318 allows the use of shear reinforcement for slabs and footings in the form of bars, as in the vertical legs of stirrups. A student of this course will gain an understanding of basic framed, two-way, conventionally reinforced, concrete flat slab and flat plate construction and design. the Flat Slab thickness. The early reinforced concrete flat slabs all had drops, and columns with capitals, and were considered to be the structure of choice for warehouse construction and heavy loads. They do not carry or transfer any load. main drawback of using flat slab. 3 for exterior panels with edge beam, and 1. Flat slabs with drop panel: Flat slab thickness at its column supports with column capitals or drop panels to increase strength. Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. The industry standard for construction joints, the Diamond Dowel® System achieves superior joint stability measurements of 0. The structures were located in seismic zone II, zone III, zone IV, and zone V with soil type II. Tests of flat plate structures indicate that, in most practical cases, the capacity is governed by shear. 6), has been used successfully by some designers to provide load-transfer capability without using dowels. Section 13. The authors propose a structural system with a curved surface on distributed supports. This posttensioned flat-slab concrete bridge system consists of precast segments that range from 4. For very high levels of load, when even common punching reinforcement systems cannot safely ensure the transfer of loads, steel shear heads are usually embedded in. Flat slab bridges consist of prestressed, precast concrete deck panels that span from bent to bent. Results of nine NSC. These loads shall be applicable for the design of buildings. The two-way flat plate slab is simply a slab of uniform thickness directly supported on columns, and it is generally suitable for relatively light loads. Often difficult to drill into these floors for pipes. But when these flat slab structures situated in seismic zones, the movements transferring from slab to column through shear increases further more and becoming more tendency to punching shear. the girder-slab concept. d/2 from the column face. Concrete joints become loose mainly because they lack an effective load transfer device such as dowels, tie bars, or reinforcing steel. The load that is supported by the slabs is transferred to the beams that span perpendicular to the slabs. Previous question Get more help from Chegg. However, in the event of loss of primarily load-carrying system, the potential for progressive collapse is relatively high. In the case of the 15th floor transfer slab, which was 600 mm thick with a self-weight of 14. The SLB-HD allows clip connection to the concrete deck of the primary structure using concrete anchors, either two ¼” concrete screw anchors,. COMPARATIVE STUDY OF SEISMIC PERFORMANCE AND ECONOMICAL ASPECT OF WAFFLE SLAB AND FLAT SLAB. Some research investigated vertical load analysis by R/C BUILDING software,. For lower loads they can have constant thickness and are called flat slabs or flat plates, see Figure 1. The main difference between flat slab & conventional slab-beam system is that the one is directly supported on the column while another system has a beam for support. • Flat slab: This is a system without beams, where a slab is supported by round or square columns (see Figure 2c). Ribakov1 & A. The strands are individually gripped in one triangle flat anchor head unit and transmit their pre-stressing forces by means of flat type anchor plate. Two-Way Flat Plate Concrete Floor System Analysis and Design. (dropped slab strip) support Point-like supports of flat slabs c) d) c) column (without column head) d) column with fungiform column head In flat slabs the total load intensity should be carried in both perpendicular directions. Voided Flat Plate (Voided Slab) The concept of the voided slab is simple in that concrete mass is removed from the areas in the slab where it is not needed to resist load and as a result of the reduced dead load, voided slabs can span further. 7 Concrete. As a result, less load will be available to transfer to beams located under a shell, while 100% of the load will. punching shear and avoid triggering of progressive collapse. A slab or panel is said to be two way slab if the ratio of longer span to the shorter span is not greater than 2 (two). Load-bearing walls and additional spans of the floor slab may be simplified as proper boundary conditions. The use of flat slab building provides many advantages over conventional RC Frame building in terms of architectural flexibility, use of space, easier formwork and shorter construction time. Eurocode 2: Span/depth ratios for RC slabs and beams. A standard plate is a planar 2D member with an arbitrary number of edges that may be straight or curved. Slab load transfer to the beams and then in to the columns. The first application is for specialised structural elements such as raft foundations, transfer plates, transfer beams, tie beams and the like. 3 Figure 2 shows a typical flat slab floor with four supporting columns. Consequently the design procedure for the shear transfer. Heat transfer through the thick portion of the slab is also significantly affected by the height of the rib and the width at the top of the rib. A transfer slab is essentially a beam constructed out of concrete and steel reinforcements that is created with a slab of concrete. (b) The calculated efficiency of system with and without. , a trestle-type bridge) has been developed and implemented over the Albemarle Sound south of Edenton, North Carolina. Assuming a relatively thing flat plate slab, one could postulate that as the slab tries to transfer moment to the column, the slab will crack and degrade in stiffness, causing a redistribution of moments in which the moment applied by the slab to the column reduces to become negligible. When determining the shear on checked shear perimeters is it still fine to assume the load acts uniformly around the full perimeter. The base of the beams are formed using. 00 kN/m2 and uniformly distributed live load of 5 kN/m2. Once the system was selected, the design team worked closely with the construction manager, the steel fabricator and Girder-Slab. 7 Concrete. Best Practices for Concrete Slab Design Using Revit® Structure Florian Aalami - ADAPT Corporation SE 100-3 Intended for structural engineers using Revit Structure (RST), this class will equip you with the skills needed to carry out detailed designs of c oncrete slab and foundation models using ADAPT® software. and the intensity is taken as per IS:875-1987 (Reaffirmed 1992). In this scenario the edges of the crack can be broken leading to further problems and degradation of the slab and widening of the initial crack. 1% of the slab cross-sectional area) through sawcut contraction joints in combination with joint spacings (Fig. floor slab is designed and reinforced to transfer loads directly to the columns which generally do not exceed 25' spacing. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e.