Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. 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. Pdf design of reinforced concrete circular slabs by twoway. Analysis of two way ribbed and waffle slabs with hidden beams. The redesign of the residences compared a two way concrete slab twcs design to a one way concrete slab owcs design. 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.
Distribute moments transverse at critical sections to column and middlestrip and if. The following example illustrates the design methods presented in the pca book. The slab is supported on beams of size 225 x 500 mm spaced at 4. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Abstractdesigning two way slabs under transverse concentrated loads is one of the challenges in designing such structures. Two way slabs have two way bending unlike one way slab.
Fanella, which appeared in the october 2001 edition of structural engineer magazine. View test prep concrete 3 design of concrete beam and slab twoway slab part 22 from engineerin 101 at royal melbourne institute of technology. We know, one way slabs are designed to transfer their loads to only two opposite support walls. Reinforcing is added to control shrinkage cracking and maximize the distance between. Twoway slab example 1 beam structure classical mechanics. The solution per ddm can be found in the twoway plate concrete floor system design example. In most cases, the slab thickness is designed as an unreinforced concrete section. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. This condition occur when the slabs are connected monolithically with support.
Member design reinforced concrete two way spanning. A simplified method for designing rc slabs under concentrated. 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. Analysis and design of two way slabs page 4 simple beam, uniformly loaded by its share of q. 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. The proposed slab system must meet the current code.
Concrete 3 design of concrete beam and slab twoway. Here are the steps for the design procedure for one way slab in steps. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Best practices of concrete pavement transition design and construction by youn su jung graduate assistant research texas transportation institute dan g. Floor slab design floors are designed as slabs on grade. The same is true for a two way slab or any other floor system. Design of reinforced concrete structures ii two way slabs 1 1. Twoway slabs structural engineering forum of india, sefi. A slab is a concrete structure constructed to provide a flat surface. The owcs was able to be integrated with the existing architectural design with minor architectural impact. Analysis and design of slabs two way civil engineers pk.
Panel edge conditions analysis and design of slabs two way. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. Twoway joist waffle slab design approach and methodology. Uniformly distributed load was considered, that represent almost practical cases. 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. So, main reinforcement is provided in both direction for two way slabs. Aci318 code provides two design procedures for slab systems. In two way slabs, load will be carried in both the directions. 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. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc.
Two way reinforced concrete slab design spreadsheet working. In a oneway spanning slab the area of each bay exceeds 30 m2. There are several methods by which two way slabs can be designed. Zollinger program manager, rigid pavements texas transportation institute and shiraz d. There are several methods by which twoway slabs can be designed. Load paths, one and two way slabs structural concepts and design duration. Here is two way rcc slab designing excel sheet template for download. When the ratio of long span to short span is less than 2, then the slab is known as a slab spanning in two directions or two way slab. Two way slab design based on aci 31811 using finite element method.
The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. When length width 2 the one way slab design go beyond effectiveness. 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 slab analysis and design using equivalent frame method efm.
In this video deisgn of two way slabs has been covered using is 456. Consequently, aci 360 was formed with this mission. Generally, there are two types of slab which are one way and two way slabs. 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. The example presented here is for twoway posttensioned design. The slab thickness for the owcs was determined to be 5 and was 10 for the twcs. Pdf analysis of two way ribbed and waffle slabs with. The document is intended primarily for design engineers, but we shall be very pleased if it is also of use. Tn342 design example 2way mondada 093090 adapt corporation. Example design combinations for deflection quasipermanent derived for typical uk. Bending will take place in the two directions in a dishlike fo. This document was uploaded by user and they confirmed that they have the.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Chapter 3 design of rectangular beams and oneway slabs 12. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Allowable stress design or working stress design wsd 2. Download our free two way slab design spreadsheet only from samotech. No certain method can be found in the design codes or references for designing two way slabs subjected to concentrated loads. This method requires various formulas for different conditions of rc slab. The first reinforced concrete design manual formerly titled aci design handbook was developed in. Tayabji regional manager ctl group report 053201 project 05320. It can be used by both practicing engineers and students. How to design a twoway slab free download as powerpoint presentation.
Slab resting on walls or sufficiently deep and rigid beams on all sides. Design procedure steps for one way slab slab design steps. Twoway concrete slab with beams spanning between supports. Two way reinforced concrete slab design spreadsheet working stress design coefficient method. This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. All methods are viable provided that the safety and serviceability of the elements are within the acceptable limits. But when lb 2 two opposite support walls cant take the load,so a criteria is required to transfer the load to four supporting walls. The unit weight of reinforced concrete is assumed to be 24 knm3. Flat plate concrete floor system does not use beams between columns or. Chapter 3 design of rectangular beams and oneway slabs. Download two way slab design excel sheet template for free.
Difference between one way slab and two way slab system. Best practices of concrete pavement transition design and. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. Standard deviation for compressive strength of concrete with example pdf. Twoway concrete floor slab with beams design and detailing csa a23. Flat slab analysis, design and detailing pdf civil. Please read the lauses mentioned in the video while solving the problem. Plan view of floor system assume partitions will not be damaged by deflections. View test prep concrete 3 design of concrete beam and slab two way slab part 2 2 from engineerin 101 at royal melbourne institute of technology. Two way slab design spreadsheet the engineering community. Two way joist slab often called two way ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. Download two way rcc slab designing excel sheet template.
Oneway and twoway slabs university of asia pacific. Twoway slab design based on aci 31811 using finite element method. Design of reinforced concrete structures ii twoway slabs 1 1. Beams of width and depth are provided on all column lines. Useful illustration example is presented in this study according.
Reinforced concrete design 1 design of slab examples and. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. The rcc slab designing tool is developed by shankar toyal, student of indian institute of technology, bhubaneswar. I have developed a microssoft excel software for design of a two way rcc slab. Oneway and twoway slabs oneway slabs transfer the imposed. The proposed slab system must be able to be constructed at a reasonable cost. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. No redistribution is allowed when method 1 or method 2 of analysis in section 3. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. Estimates in building construction sample spreadsheet.
Oneway slabs transfer the imposed loads in one direction only. In two way slab, the ratio of longer span l to shorter span b is less than 2. Design of concrete structures as easy as possible by. How to design a two way slab free download as powerpoint presentation. The slab thickness depends on the type of loads on the floor slab. Before you start, you must be familiar with your operating system. What are the difference between tender and contract documents.
Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need to be taken into account to reduce the complexity of calculations needed when. How to design concrete structures using eurocode 2. The following example illustrates the example building. Analysis and design for main block is to be performed. Bending will take place in the two directions in a dishlike form. Two way concrete slabs with openings experiments, finite element analyses and design piotr rusinowski. He developed a project economic design of two way rcc slabs and this slab designing excel is a part of his project.
Shear force at short span, shear force at long span, where. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. The design shear force of twoway restrained slab can be calculated as follows. Two way slab design based on aci 31811 using finite element method the slab is designed as two way when the ratio of long span to short span is less than 2, then the slab is known as a slab spanning in two directions or two way slab. Design of a two way slabs for punching shear resistance. The slab is to be designed as a reinforced concrete two way slab supported on beams. Accordingly, main reinforcement is required in the two directions. 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. 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. Design of reinforced concrete structures ii twoway slabs. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Posttensioned oneway slab pennsylvania state university.
Only external walls 230 mm thick with 12 mm plaster on both sides are considered. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Multi storey, post tension, two way, design, comparison. The codes governing the design of the one way slab will be aci 31802 and ibc 2003.
Aug 03, 2016 the design steps have been presented in the following question how do i degisn two way slab. One way concrete slab design part 2 area of tension steel canadian code duration. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. Rectangular beams and one way slabs page 2 of 9 two methods. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. Shrinkage and temperature reinforcement in twoway post.
Concrete 3 design of concrete beam and slab twoway slab. Two way slab design by direct design method as per aci 31811. Analysis and design of slabs two way two way edge supported slabs two way slabs. Design of a two way rcc slab structural engineering forum. The design bending moment of two way restrained slab can be calculated as follows. They may be supported on two opposite sides only fig. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. The committee is also aware of projects on which design professionals have specified temperature tendons between the bands in two way posttensioned slabs. Member design reinforced concrete two way spanning slab bs8110 v2015. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. In the design of concrete slabs with openings the building codes propose.
Design of twoway slab by coefficient method the constructor. If the ratio of longer dimension of the slab panel to the shorter dimension is greater than or equal to 2 then it is designed as one way slab. From the study it is considered that post tension slab is more economical than two way slab. Example design of two way edgesupported solid slab. One way and two way slabs one way slabs transfer the imposed loads in one direction only. Two way concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. Twoway slab analysis and design using elastic frame method efm.
However, plastic method can be the best method for designing such cases of two way slabs. Reinforced concrete design 1 design of slab examples. Slab is one of the most famous part of a construction project. Two way flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. 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. Collection of civil engineering design spreadsheet. For those who do not know what are the des ign requirements of a slab. Design of slabs on grade aci committee was specifically charged to cover design. Time saving design aids twoway slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2.
Pdf slabs are the flooring systems of most structures including office. Twoway slab design based on aci 31811 using finite. Assume partitions cannot be damaged by deflections. Design of a two way rcc slab structural engineering. Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. The basic design procedure of a twoway slab system has five steps. Basic steps in two way slab design choose layout and type of slab. Design of slabtwo way excel sheet online civilforum. Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf.
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