A slab supported on all four edges with an aspect ratio of longer to shorter theoretical span less than. The twoway slab s1 is supported by four beams twoway slab behaviour the behavior of a twoway slab is similar to that of a oneway slab the only difference being that now the slab loads will be carried in both directions. This method was provided in the american concrete institute aci in 1963 to design two. I know that there is aashto for deck design using one axle or point loads, but these point loads a are smaller. Easy to use software becoming more widely available very accurate if used properly better than grillage.
Rapt is a two dimensional post tension beamslab design software. In general, the beamslab flexural stiffness ratio is about 0. Home resource calculation and analysis design calculation for two way slab. Columns are asymetrical and part of the slab on the 2nd floor is a cantilever slab on one edge the edge with a radius.
Slab being the first element to be designed has pretty much importance as the whole structural design is based on the design of slab. Jul 21, 2017 rapt is a two dimensional post tension beam slab design software. The twoway slab on beams, analyzed as separate elements, appeared overdesigned with unnecessarily high safety factors. Design calculation for two way slab as per bs 8110. Reference 5 focused on analysis of two way ribbed slabs with.
If slab is supported on all four sides and r shorter side longer side way slab. Mar 12, 2017 the direct design method is an approximate method used to analyze two way slabs. Design of two way ribbed slab 18 x 25 m clear span 1. Slab moments calculated by various slab analysis methods are compared with each other for idealized flatplate and two way slab onbeam structures. The two way slab s1 is supported by four beams two way slab behaviour the behavior of a two way slab is similar to that of a one way slab the only difference being that now the slab loads will be carried in both directions. The analysis was based on the method developed by johansson, in which a general formula was derived to calculate the ultimate positive bending moment for the long span. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. Twoway slabs have two way bending unlike oneway slab. Suspended slabs can include flat, twoway, waffle, and ribbed framing systems. Design of reinforced concrete structures ii twoway slabs 1 1. Design of reinforced concrete structures ii twoway slabs. This paper deals with the yield line analysis of orthotropic reinforced concrete twoway slab under the effect of uniformly distributed pressure load.
I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Twoway rc flat slab design in adapt builder 2018 youtube. Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Waffle slab twoway pan joist twoway joist slab, also called a waffle slab. The requirements for two of them are described in detail in aci 31814 chapter 8 8. The elements can be triangular, rectangular or quadrilateral. Advanced slab design mode enables concrete slabs defined with or without holes to be designed using the ramconcept or adaptbuilder software. In the absence of advanced analysis software, like fem modelling, it was necessary to idealize the slabs, one way or two way slabs, to use direct methods for the design. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Every example ive ever seen on two way slab design is for uniformly distributed loads. Analysis, design and investigation of beams, one and twoway slab systems, flat plate, flat slab, waffle slab and slab bands. This is a part of his project economic design of two way rcc slabs under prof s.
I wanted to see if anyone has any good literature on two way slab design for point loads. Two way rcc slab designing tool in microsoft excel developed by shankar tayal a 3rd year student of school of infrastructure, indian institute of technology, bhubaneswar. In case of one ways slabs, the aci approximate analysis is applicable to one way slab system where a one way slab is continuous with a one way slab. Comparison of concrete two way slab analysis and design methods a slab system can be analyzed and designed by any procedure satisfying equilibrium and geometric compatibility. Two way slab building design by staad pro v8i software youtube. Twoway concrete slab with beams spanning between supports. Static analysis of twoway slabs, subjected to uniform load, is performed using tables, which give the fundamental support moments, span moments and shear forces. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1.
Since 1971, all twoway reinforced systems, with or without beams, have been subject to the same integrated analysis and design procedures chapter. Safis reinforced concrete slab design assistant becomes the ultimate tool for slab design in a simple and intuitive way. The equivalent frame method generally results in reduced support moments, at the expense of an increase in midspan values, when compared to the simple frame method. The assistant generates column strips and middle strips that are adapted to the geometries of the bidirectional span of the slab. Design of two way slabs by coefficient method slab is one of the basic parts of a building. Subscribe our youtube channel to get more videos update relating to structural detailing, structural modeling, analysis and design software. In the absence of advanced analysis software, like fem modelling, it was necessary to idealize the slabs, oneway or twoway slabs, to use direct methods for the design.
The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame. Tekla structural designer 1way decomposes panel loads applied to the slab directly on to supporting memberstwoway spanning slab edges before performing 3d analysis. Two way slab design spreadsheet the engineering community. This method was provided in the american concrete institute aci in 1963 to design two way slabs carried by steel beams, deep beam, or walls. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. Safe provides an immensely capable yet easytouse program for structural designers, provideing the only tool necessary for the modeling, analysis, design, and detailing of concrete slab systems and foundations. On the other hand one way slabs span in shorter direction and is designed for one way bending. The paper deals with the modeling and analysis of the ultimate behavior of twoway composite slabs. Structural modeling and analysis of concrete floor slabs. The ratio of the total costs was found to be within the range 1. On the other hand oneway slabs span in shorter direction and is designed for one way bending. Its more user friendly compared to other pt design softwares. Roof panel overlapping a one way spanning slab item. The program covers wide range of twoway slab systems and can be used for more complex slab layouts.
I wanted to see if anyone has any good literature on twoway slab design for point loads. Every example ive ever seen on twoway slab design is for uniformly distributed loads. Okay, i know it is based on upper bound thorem and the solution might be unsafe. I have developed a microssoft excel software for design of a two way rcc slab. Part of the gse concrete design, it allows the user to quickly and efficiently generate design strips for any concrete slab directly linked to the automated functionalities of the line of integration using finite elements, this application allows the user to. Dec, 2017 in other words, it can be said that, two way slabs span in both directions. The paper deals with the modeling and analysis of the ultimate behavior of two way composite slabs. Jun 16, 2015 subscribe our youtube channel to get more videos update relating to structural detailing, structural modeling, analysis and design software. The coefficient method may be the simplest, easiest and the quickest approach for the design of twoway slab supported by edge beam on all slab sides. Two way slabs have two way bending unlike one way slab. Apr 18, 2019 this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Mar 14, 2018 two way slab design spreadsheets to eurocode 2 14 march 2018 off by the engineering community two way spanning slabs for rectangular slabs with standard edge conditions and subject to uniformly distributed loads, normally the bending moments are obtained using tabulated coefficients. Roof panel overlapping a oneway spanning slab item.
The direct design method is an approximate method used to analyze two way slabs. If slab is supported on all four sides and r shorter side longer side content and search advanced slab design. Its typically used when stiffness is important or if there are abnormally heavy loads. Analysis of twoway slabs using direct design method shms. Conversely, if the load is delivered to the beams and the girders. This spreadsheet undertakes these calculations and returns. Twoway slab design for point loads structural engineering. Analysis and design of one way and two way slab in staad. Modelling and analysis of twoway composite slabs request pdf. In general, if the load from the slab is delivered to the beams in one direction, then the system is one way. Buildinghow products books volume b slabs twoway slabs.
The rotation angle of the slab item and not the roof panel determines the decompostion direction. Effects of inclusion of boundary condition factor in the proposed hmin equation were studied and justified using sap2000 software. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Analysis and design of slabs one way civil engineers pk. Design of slabtwo way excel sheet online civilforum. The output of the program for the slab in the example is shown in the following pages. Sep 28, 2017 the consideration at this point is to determine whether a system is one way or two way, allowing the tributary width and load distribution to be assigned to the member. Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a. Two way slab being supported on four sides the load will be carried in both the directions. Reinforced concrete slab and beam design software adaptrc 2017 product overview an easytouse and learn software for the design, analysis, and investigation of reinforced nonprestressed concrete beams, beam frames, slabs and floor systems a must have production tool in every structural engineering office. Twoway slabs page 6 of 14 the pca computer program pcaslab can be used to expedite the design of different slab systems. The coefficient method may be the simplest, easiest and the quickest approach for the design of two way slab supported by edge beam on all slab sides. Tekla structural designer 1 way decomposes panel loads applied to the slab directly on to supporting members two way spanning slab edges before performing 3d analysis. This spreadsheet performs an analysis and design of twoway spanning reinforced concrete slab.
Analysis of two way ribbed and waffle slabs with hidden beams. I have a project in school where i have to analyze a 2 story building with a slab deck on the roof. In case of two way slabs, the moment coefficient tables are applicable to two way slab system where a two way slab is continuous with a two way slab. Two way rcc slab designing excel sheet civil engineering. What is the best software to design a post tension slab. Two way slab building design by staad pro v8i software. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. Reinforced concrete slab and beam design software adaptrc. The explicit transverse torsional member method is found to give good results for drifts and slab beam actions, and is recommended for analysis and design of two way slab systems under combined. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen.
An easytouse and learn software for the design, analysis, and investigation of reinforced nonprestressed. In other words, it can be said that, twoway slabs span in both directions. Bending will take place in the two directions in a dishlike form. Analysis of twoway slabs using direct design method. Area loads in oneway and twoway systems skyciv cloud. Analysis and design of slabs two way civil engineers pk. Design of a two way rcc slab structural engineering forum. In two way slabs shorter direction strip carry greater %age of load. Because there are joists in both directions, this floor system is the strongest and will have the least deflection. Detailed flexural and shear reinforcement with aci torsion effects and. Best is subjective, so i will give my opinion here. This spreadsheet undertakes these calculations and returns design moments for use during detailed design. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. The following example illustrates the example building.
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