A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Twoway flat plate concrete floor system analysis and design. Under the action of loads, the two way slab will deflect in a dish or saucerlike form and if the slab is not cast monolithically with the supports like walls or beams, corners of the two way. Read on to find out just how to combine multiple pdf files on macos and windows 10. A pdf file is a portable document format file, developed by adobe systems. Here the slab or slab panel is supported along its four edges by relatively deep, stiff, monolithic concrete beams or walls or steel girders. Determine the minimum thickness of slab from serviceability criteria of deflection control. One of the fun things about computers is playing with programs like paint. The design bending moment of two way restrained slab can be calculated as follows. Arrange the actions to produce the most critical conditions. May 20, 2020 the slab is known as two way slab when the ratio of the long span is less than 2 and infloor of multistory buildings this type of slabs are mostly used. Two way flat slab concrete floor with drop panels system analysis and design design the concrete floor slab system shown below for an intermediate floor considering partition weight 20 psf, and unfactored live load 60 psf. Introduction in reinforced concrete construction, slabs are used to provide flat, useful surfaces. Calculate factored moment and shear force by considering the onemeter width of the slab.
Types of one way slab one way slab may be solid hollow ribbed 6. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Design of two way edgesupported slab by coefficient method a two way edgesupported concrete floor panel of 21 x 26 ft is supported by four beams of 12 in. Load transfer in a one way slab, b two way slab nilson fig. Manual for design and detailings of reinforced concrete to. Keep in mind, while analyzing or designing slab, we always take the width of the slab as one meter. Further information for the design of two way, ribbed or waffle slabs is given in the appropriate sections on pages 5 and 6. When zd is determined, the prestressing force required to balance an. Member design reinforced concrete one way spanning slab. Design the flexural reinforcement to resist the factored moments in step 6. Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented.
The same is true for a two way slab or any other floor system where. Slabs may be supported on two opposite sides only, as shown in figure 31a, in which case the structural action of the slab is essentially one way, the loads being carried by the slab in the direction perpendicular to the supporting beams. Flat plates flat slabs waffle slabs two way edgesupported slabs two way edgesupported slabs. Time saving design aid page 9 of 14 two way slabs pcaslab v2. Distribute moments transverse at critical sections to column and middlestrip and if. Pdf is a hugely popular format for documents simply because it is independent of the hardware or application used to create that file. Member design rc one way spanning slab 030915 member design reinforced concrete one way spanning slab bs8110 v2015. Time saving design aids two way slabs page 6 of 14 the pca computer program pcaslab can be used to expedite the design of different slab systems. Summary and comparison of two way slab design results. Bending will take place in the two directions in a dishlike form. 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.
For those who do not know what are the des ign requirements of a slab. Pdf design of reinforced concrete circular slabs by twoway. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. If your pdf reader is displaying an error instead of opening a pdf file, chances are that the file is c. Total depth is not less than 3 times the slab thickness aci. Mony mom 3 coefficient method was developed by marcus and introduced into the united states in 1963 by rogers. Oneway and twoway slabs university of asia pacific. Depending on the type of scanner you have, you might only be able to scan one page of a document at a time. In lieu of detailed calculation for deflections, csa a23. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. According to the way loads are transferred to supporting beams and columns, slabs are classified into two.
You can use the tools in paint to add something to a different document. Member design rc two way spanning slab 030915 member design reinforced concrete two way spanning slab bs8110 v2015. Pdf design of reinforced concrete flat slab with drop panel. To combine pdf files into a single pdf document is easier than it looks. Design procedure steps for one way slab slab design steps. Columns are 30cm x 30cm, equivalent partitions load250 kgm2, live load 400kgm2, 280 kgcm2 4200 kgcm2, slab thickness 16cm 11. Two way concrete floor slab with beams design and detailing csa a23.
This condition occur when the slabs are connected monolithically with support. Two way joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Design of slabs and ribs slabs assuming 10 square pans per slab. Reinforced concrete design 1 design of slab examples. There may be beams on all four sides, as shown in figure 31b, so that twoway slab action is obtained. Based on the stiffness requirement assume suitable depth and calculate the effective span. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Bending moment and shear force of two way slab are depend on l y l x ratio and. Two way slab design by direct design method as per aci 31811.
Twoway flat plate concrete floor system analysis and. Direct design method ddm for slab systems with or without beams loaded only. In this video deisgn of two way slabs has been covered using is 456. How to create pdf files from autodesk design it still works. The program covers wide range of two way slab systems and can be used for more complex slab layouts. A slab strip of unit width is analysed using simple beam theory. It analyzes beams, one way slab systems including standard and wide module joist systems and two way slab systems including waffle and slab bands. The slab has to carry a distributed permanent action of 1.
May, 2017 for two way slabs supported on all four edges by walls, steel beams or monolithic concrete beams having a total depth not less than 3 times the slab thickness. Member design reinforced concrete two way spanning slab. The lateral loads are independently resisted by shear walls. Cross sectional constant defines torsional properties c x. The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance. I paid for a pro membership specifically to enable this feature. 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. Twoway flat plate concrete floor system design structurepoint. Direct design method is used for the structural analysis and design of slabs. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. This guide covers the analysis and design of slabs to eurocode 21. Most electronic documents such as software manuals, hardware manuals and ebooks come in the pdf portable document format file format.
Design of one way slabs the structural action of a one way slab may be visualized in terms of the deformed shape of the loaded surface. Twoway concrete floor slab with beams design and detailing. Design of reinforced concrete structures ii two way slabs 8 c. Unless otherwise stated, the general provisions and dimensioning of steel bars.
The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. Here are the steps for the design procedure for one way slab in steps. By michelle rae uy 24 january 2020 knowing how to combine pdf files isnt reserved. For the given data, design strip 1234 of the two way slab for flexure. Select the size and spacing of the reinforcement to fulfill the requirements for crack. Pdf design of reinforced concrete circular slabs by two. How to design concrete structures using eurocode 2. Alternate design method design procedure of twoway slabs.
Standard fire minimum dimensions mm resistance one way a,b two way a,b,c,d ribs in two way spanning ribbed slabs e l y l x. Jan 01, 2019 this paper deals with the problem of optimum design of reinforced concrete two way ribbed waffle slabs using genetic algorithms. This article explains what pdfs are, how to open one, all the different ways. The building is located in seismic zone iii on a site with medium soil. Generally, there are two types of slab which are one way and two way slabs.
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. Detailed illustration of analysis and design of flat plate slab using ddm can be found in two way flat plate concrete slab floor analysis and design csa a23. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two opposite short edges. Two way rcc slab designing excel sheet civil engineering. Twoway joist concrete slab floor waffle slab system. This is a part of his project economic design of two way rcc slabs under prof s. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. One way slab one way slabs are those slabs with an aspect ratio in plan of 2. One way slabs normally design as a beam with cables running in the direction of the span at uniform centres. The slab panel is part of the suspended floor slab and so the upper and lower surfaces of the slab are interior for durability cover and crack control purposes. Two way slab design spreadsheet spreadsheet, slab, hospital. 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.
Design of reinforced concrete structures ii twoway slabs. The reinforcement for the column strip was design for the direction from easttowest only. The two classifications are one way slab and two way slab. The requirement does not preclude the use of the direct design method for beams in one direction only or on one side only, such as spandrel beams. Explanatory text was added to each chapter, while maintaining relevant design aids and illustrative examples. Slabs are usually used in floor and roof construction. 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. A six storey building for a commercial complex has plan dimensions as shown in figure 1. This condition occur when the slab are supported at four side of the beams or walls and the ratio of long span to short span is equal or less than 2. Determine whether the slab is one way or two way slab by calculating aspect ratio. Job title xx parameters of beam spanning in x direction slab. Luckily, there are lots of free and paid tools that can compress a pdf file in just a few easy steps. Quick guide to design of one way slab with is code 456. Member design reinforced concrete two way spanning slab bs8110 v2015.
The following example illustrates the example building. Check for deflection same method as two way slab allowable spand eff. A civil engineer must know all the aspects regarding the flat floor system. Choose design method equivalent frame method use elastic frame analysis to. Before discussion of this method, we have to study some concepts. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Analysis and design of twoway slabs page 1 chapter 3. To make distinctions between the equations quoted from the code and the equations derived in this manual, the former will be prefixed by ceqn and the latter by eqn.
Appendix c derivation of basic design formulae of r. Oct 23, 2019 two way slab design spreadsheet this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Design of twoway floor slab system comparison of one way and two way slab behavior one way slabs. Table 3 may be used to determine bending moments and shear forces for slabs. The one way slab is deflected in one way direction and primary reinforcement is. Design procedure the basic design procedure of a two way slab system has five steps. Once youve done it, youll be able to easily send the logos you create to clients, make them available for download, or attach them to emails in a fo. Determine the partial factors see below for each applicable combination of actions. This pdf file contains a chapter named design of flat slabs of 23 pages with various aspects of flat slabs including four example of flat slab design. Pdf file or convert a pdf file to docx, jpg, or other file format. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. If your scanner saves files as pdf portbale document format files, the potential exists to merge the individual files into one doc. Moment coefficient table for two way slab free pdf file sharing.
The basic design procedure of a two way slab system has five steps. Design of reinforced concrete structures ii two way slabs. Distribute moments transverse at critical sections to. Flat slab analysis, design and detailing pdf civil engineering. Two way slab design spreadsheet this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab.
Making a pdf file of a logo is surprisingly easy and is essential for most web designers. This example focuses on the analysis of flat plates using efm. Two way slabs prestressing tendons cgs at top 48 mm at bottom 48 mm nonprestressing reinforcement cover at top 25 mm at bottom 25 mm 143 design criteria 143. Flat slab system is an important division of concrete floor system. Jan 10, 2016 design of reinforced concrete structures ii two way slabs 10 example 1. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in. 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.
Method uses a set of coefficients to determine the design moment. Two way slab analysis and design using elastic frame method efm efm as known as equivalent frame method in the aci 318 is the most comprehensive and detailed procedure provided by the csa a23. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Flat slab analysis, design and detailing pdf civil. An oversized pdf file can be hard to send through email and may not upload onto certain file managers. Many of these earlier design aids intended to carry out relatively simple design calculations were eliminated in the sp1709 edition.
This means it can be viewed across multiple devices, regardless of the underlying operating system. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two. It also incorporates torsion into shear design and investigation of beam systems. Please read the lauses mentioned in the video while solving the problem. The paint program can help you make new image files, but it cannot open document or pdf file. Type of slab is strongly affected by architectural and construction considerations.
Member design reinforced concrete two way spanning. Reinforced concrete design 1 design of slab examples and. Two way slab design static equilibrium of twoway slabs total moment in both beams full load was transferred eastwest by the planks and then was transferred northsouth by the beams. Beam sections against flexure appendix d underlying theory and design principles for plate bending element appendix e moment coefficients for three side supported slabs appendix f derivation of design formulae for rectangular columns to rigorous. One way slab design procedure with example design of one. Pdf design of reinforced concrete flat slab with drop. Memberlocation all beams beam sag beam hog ebeam sag ebeam hog.
The slab is to be designed as a reinforced concrete two way slab supported on beams. The main reinforcement for two way slab are designed in two directions which are xdirection and ydirection. Oneway and twoway slabs oneway slabs transfer the imposed. Design the slab following the provisions of the aci code. Behavior of two way slabs a rectangular slab supported on four edge supports, which bends in two orthogonal directions and deflects in the form of dish or a saucer is called two way slabs. Two way flat slab concrete floor with drop panels system. The output of the program for the slab in the example is shown in the following pages. If ratio of longer span to shorter span is less than 2, then it is two way slab, otherwise one way slab. Accordingly, main reinforcement is required in the two directions.
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