This example is to be used for educational purposes only. Download two way slab design spreadsheets to eurocode 2 en 19921. Rcc slab design is a free app for designing one way and two way reinforced concrete slab. These materials are originally located at different websites. Excel sheet to design slab one way and two way all. Twoway restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as twoway restrained slab. A slab is supported only one direction that is one way slab now tha loads are transferred only this two supports.
Excel design of one way slab using excel sheet i have. Download two way slab design excel sheet template for free. Reference 5 focused on analysis of two way ribbed slabs with. Design of reinforced concrete structures ii twoway slabs. So, main reinforcement is provided in both direction for two way slabs. Some key features of this course, topics are taught thoroughly and systematically to clarify the basic concepts and fundamental principles without weakening technical hardship. Load transfer in a one way slab, b two way slab nilson fig. Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. Reinforced concrete design 1 design of slab examples and. Time saving design aids two way slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. For designing two way slab refer is code 4562000 and sp16. Design of one way slabs as per is 456 worked step by step.
Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Design of two way slabs is 456 limit state method youtube. Distribute moments transverse at critical sections to column and middlestrip and if. Analysis and design of slabs two way civil engineers pk. This type of behaviour holds good when the ratio between length and breadth of the slab is less than two. Simply supported two way slab design as per is 456. It is always necessary to design a safe and load bearing capable slab. The aim of this course is to design structural elements like a beam, column, slab. C slab to carry a factored load of 15000nm2 inclusive of its own weight. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa.
Correlation between sbc and modulus of subgrade reaction. The design bending moment of two way restrained slab can be calculated as follows. The load on the slab is carried by the short span in one direction. It is convenient to think of such slabs as consisting of two sets of parallel strips, in each direction and intersecting each other. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. In this video the basic theory of one way continuous slab as per is. Also the slab is supported four sides but the length breadth lylxration is greater than or equal to two, the slab is designed as one way slab. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. Storey number storey numbers are given to the portion of the building between two successive grids of beams. Design of reinforced concrete structures ii twoway slabs 1 1. 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. Design of reinforced concrete structures ii two way slabs 1 1. Base slab crack calculation as per is 456 spreadsheet. This lecture is continuation of previous lecture and elaborates how the excel, a powerful.
This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. This entry was posted in excel sheets and tagged excel sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by civilengineerspk. The program covers wide range of two way slab systems and can be used for more complex slab layouts. The design of two way rectangular slabs supported on all four sides without provision for torsion at corners is carried out as per table 27, indian standard is 456 app. Generally, an ebook can be downloaded in five minutes or less. Bending will take place in the two directions in a dishlike form.
Make sure you scan the downloaded attachment with updated. In this video deisgn of two way slabs has been covered using is 456. Flat slab system is an important division of concrete floor system. In two way slabs, load will be carried in both the directions. The slab has to carry a distributed permanent action of 1. The behaviour of reinforced concrete beam sections at ultimate loads has. Voided two way slab design based on aci 31814 spreadsheet concrete pool design spreadsheet based on aci 31814 suspended ceiling seismic loads calculation spreadsheet. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. Oneway and twoway slabs university of asia pacific. So part of the load is carried by one set and the remainder by the other. 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. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. This condition occur when the slabs are connected monolithically with support. Two way slabs are the slabs that are supported on four sides and the ratio of longer span l to shorter span b is less than 2.
Find the effective span which is lesser of i distance between centres of bearings, and ii clear span and effective depth. Slab design, bs 8110 slab design, how to determine ultimate load for slabs, how to check for deflection in slabs, how to calculate for dead load, how to calculate for lever arm, basics of slab design, how can i design a 2 way spanning slab. Jun 14, 2017 download two way slab design excel sheet template. Table of contents reinforced concrete slab design guidelines a effective span of slab. Behavior of two way slab since, the slab rest freely on all sides, due to transverse load the corners tend to curl up and lift up. One way slab is supported by beams in only 2 sides. Design of two way slab by is 456 building materials civil. Check for deflection is as per the provsions in cl. Please read the lauses mentioned in the video while solving the problem. In which code book are the bending moment coefficients for. I also request if someone can make similar sheet for designing of one way slab.
For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w. For increased ratio of sides, the slab virtually spans along the shorter side and it is designed as one way slab. Excel sheet to design slab one way and two way all about. One way slab design excel sheet civil engineers pk. A spreadsheet program on reinforced concrete isolated footing design. In a two way slab the slab has to resist the following forces. Jan 18, 2014 it is always necessary to design a safe and load bearing capable slab. Base plate design example download pile cap design calculation download core wall design spreadsheets to eurocode 2 en 19921. Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. Slab shear strength twoway shear check the adequacy of slab thickness for punching shear twoway shear at an interior column figure 4. In two way slabs shorter direction strip carry greater %age of load.
Nov 12, 2015 design of a structural member is governed by what kind of forces it has to resist. 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. Strength design or ultimatestrength design usd strength design or ultimatestrength design usd with strength design method, the working dead load dl and live load ll are. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Nov 30, 2018 static equilibrium of two way slabs total moment in both beams full load was transferred eastwest by the planks and then was transferred northsouth by the beams. Oneway and twoway slabs oneway slabs transfer the imposed. Two way rcc slab designing excel sheet civil engineering. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Analysis of two way ribbed and waffle slabs with hidden beams.
For the example building, the storey numbers are defined as follows. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Two way slab being supported on four sides the load will be carried in both the directions. However main reinforcement bar and distribution bar in transverse direction. The basic design procedure of a two way slab system has five steps. Pt designer design of posttensioned concrete floors.
Two way slabs have two way bending unlike one way slab. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. I have developed a microssoft excel software for design of a two way rcc slab. The analysis of twoway slabs is given in section 31, is. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. The numbering of the members is explained as below. The output of the program for the slab in the example is shown in the following pages. Reinforced concrete slab design and detailing guide is456. This lecture is a part of concrete engineering subject for the third year civil engineering students at james cook university, townsville australia. For designing two way slab refer is code 456 2000 and sp16. Two way slab design by direct design method as per aci 31811. This is a part of his project economic design of two way rcc slabs under prof s.
The effective depth d of two way slabs can also be assumed using cl. Useful rcc slab design app with clean and intuitive user interface. Following are the rcc slab design and detailing guidelines. Two way rc slab with concentrated load bmv structural 21 jun 04 09. Design of two way slab by is 456 free download as excel spreadsheet.
The dimensions of an interior bay are shown in figure 1. Concrete slab behave primarily as flexural members and the design is similar to that of beams. Design tables 2 way slabs as per is 456 with deflection check. To compare these systems, a typical interior panel was selected from the northeast wing, which is highlighted in figure 1 on page 7.
Rectangular beams and one way slabs page 2 of 9 two methods. Assume the thickness of slab take 4 cm per metre run of the span. The program is developed around the robust computational core of two popular programs ptdata. In the sixties and seventies, i used the the text book theory of plates and shells by timoshenko.
The following example illustrates the example building. The direct design method of analysing a twoway slab is not recommended. 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 this is a part of his project economic design of two way rcc slabs under prof s. It can be used by both practicing engineers and students. Slab is one of the most famous part of a construction project. The pca computer program pcaslab can be used to expedite the design of different slab systems. The same is true for a two way slab or any other floor system. Accordingly, main reinforcement is required in the two directions. Reinforced concrete design 1 design of slab examples. Chapter 3 design of rectangular beams and oneway slabs 12. Two way restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two way restrained slab. One and two way slab quantity excel sheetfree download. The design bending moment of twoway restrained slab can be calculated as follows.
Design of a two way rcc slab structural engineering. Design tables 2 way slabs as per is 456 with deflection check 1. Direct design method, that could have been named the direct analysis method because it determines or prescribes moments for different parts of the slab panel without the need to conduct structural analysis, is explained in the following sections. Coefficients, for a variety of load types, with a variety of boundary conditions are tabulated and you also have the theory and derivations with a l. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Slab shear strength two way shear check the adequacy of slab thickness for punching shear two way shear at an interior column figure 4. 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. Basic steps in two way slab design choose layout and type of slab. Second thing is that i want a similar sheet for designing of one way slab. Slab resting on walls or sufficiently deep and rigid beams on all sides. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Moduleiii design of short and long columns with axial and eccentric loading, design of isolated column footing.
Flat slab analysis, design and detailing pdf civil. Determine the maximum bending moment for a one meter wide strip of the slab. Apr 18, 2019 this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. The unit weight of reinforced concrete is assumed to be 24 knm3. A civil engineer must know all the aspects regarding the flat floor system.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Two way slabs can be divided in following three categories. Allowable stress design or working stress design wsd 2. Design of one way and two way slabs, design of staircases. Method of rcc slab design as per is 456 reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for one way and two way slabs as per is 456. Two way slab design to aci free download and software. Two way slab design spreadsheet the engineering community. Design of slabtwo way excel sheet online civilforum. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be a two way slab.
Excel sheets are often very useful to determine the slab thickness and reinforcement detailing. The ratio of the total costs was found to be within the range 1. I want the designing to be be done using is 456 2000 code and not aci code. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be a twoway slab.