2 way slab design sample pdf documents

Two way slab design spreadsheet the engineering community. Pdf design of reinforced concrete circular slabs by twoway. Design of a two way rcc slab structural engineering forum. Download two way rcc slab designing excel sheet template.

Allowable stress design or working stress design wsd 2. Accordingly, main reinforcement is required in the two directions. 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 codes governing the design of the one way slab will be aci 31802 and ibc 2003. Here is two way rcc slab designing excel sheet template for download. Design of slabs on grade aci committee was specifically charged to cover design. The slab is supported on beams of size 225 x 500 mm spaced at 4. 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. This document was uploaded by user and they confirmed that they have the. 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.

Member design reinforced concrete two way spanning. For those who do not know what are the des ign requirements of a slab. Design of a two way rcc slab structural engineering. 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. Pdf analysis of two way ribbed and waffle slabs with. Chapter 3 design of rectangular beams and oneway slabs. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected.

Two way reinforced concrete slab design spreadsheet working stress design coefficient method. Tn342 design example 2way mondada 093090 adapt corporation. Design of reinforced concrete structures ii twoway slabs 1 1. Shear force at short span, shear force at long span, where. Design of reinforced concrete structures ii two way slabs 1 1. 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. 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. A simplified method for designing rc slabs under concentrated. Download two way slab design excel sheet template for free. The proposed slab system must meet the current code. When length width 2 the one way slab design go beyond effectiveness.

Concrete 3 design of concrete beam and slab twoway. This condition occur when the slabs are connected monolithically with support. We know, one way slabs are designed to transfer their loads to only two opposite support walls. Rectangular beams and one way slabs page 2 of 9 two methods. This method requires various formulas for different conditions of rc slab. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Generally, there are two types of slab which are one way and two way slabs. The following example illustrates the design methods presented in the pca book.

Standard deviation for compressive strength of concrete with example pdf. A slab is a concrete structure constructed to provide a flat surface. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. 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. Aci318 code provides two design procedures for slab systems.

I have developed a microssoft excel software for design of a two way rcc slab. Two way slab design based on aci 31811 using finite element method. Twoway concrete slab with beams spanning between supports. Concrete 3 design of concrete beam and slab twoway slab. In most cases, the slab thickness is designed as an unreinforced concrete section.

In this video deisgn of two way slabs has been covered using is 456. The unit weight of reinforced concrete is assumed to be 24 knm3. Design of concrete structures as easy as possible by. However, plastic method can be the best method for designing such cases of two way slabs. All methods are viable provided that the safety and serviceability of the elements are within the acceptable limits. Before you start, you must be familiar with your operating system. Analysis and design of slabs two way two way edge supported slabs two way slabs. In a oneway spanning slab the area of each bay exceeds 30 m2. One way concrete slab design part 2 area of tension steel canadian code duration.

Beams of width and depth are provided on all column lines. 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. The design shear force of twoway restrained slab can be calculated as follows. Pdf slabs are the flooring systems of most structures including office. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. Slab is one of the most famous part of a construction project. Consequently, aci 360 was formed with this mission. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. The slab thickness for the owcs was determined to be 5 and was 10 for the twcs. Chapter 3 design of rectangular beams and oneway slabs 12.

The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. 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. Multi storey, post tension, two way, design, comparison. Twoway joist waffle slab design approach and methodology. Please read the lauses mentioned in the video while solving the problem. 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. Assume partitions cannot be damaged by deflections. View test prep concrete 3 design of concrete beam and slab twoway slab part 22 from engineerin 101 at royal melbourne institute of technology. Example design combinations for deflection quasipermanent derived for typical uk. So, main reinforcement is provided in both direction for two way slabs. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. The other ways of analysis of twoway slabs are the direct design method and the equivalent frame method.

Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Member design reinforced concrete two way spanning slab bs8110 v2015. The following example illustrates the example building. Design of twoway slab by coefficient method the constructor. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Design of slabtwo way excel sheet online civilforum. Useful illustration example is presented in this study according. Design procedure steps for one way slab slab design steps.

How to design a two way slab free download as powerpoint presentation. Best practices of concrete pavement transition design and construction by youn su jung graduate assistant research texas transportation institute dan g. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. There are several methods by which two way slabs can be designed. 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. Flat slab analysis, design and detailing pdf civil. This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Here are the steps for the design procedure for one way slab in steps. It can be used by both practicing engineers and students. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. How to design concrete structures using eurocode 2. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Oneway and twoway slabs oneway slabs transfer the imposed.

Two way reinforced concrete slab design spreadsheet working. Reinforcing is added to control shrinkage cracking and maximize the distance between. From the study it is considered that post tension slab is more economical than two way slab. 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. What are the difference between tender and contract documents. The proposed slab system must be able to be constructed at a reasonable cost. Abstractdesigning two way slabs under transverse concentrated loads is one of the challenges in designing such structures. Twoway slab design based on aci 31811 using finite element method. Flat plate concrete floor system does not use beams between columns or. The same is true for a two way slab or any other floor system. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. No redistribution is allowed when method 1 or method 2 of analysis in section 3. 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.

Slab resting on walls or sufficiently deep and rigid beams on all sides. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. 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. Example design of two way edgesupported solid slab.

Analysis and design for main block is to be performed. 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. 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. He developed a project economic design of two way rcc slabs and this slab designing excel is a part of his project. No certain method can be found in the design codes or references for designing two way slabs subjected to concentrated loads.

Oneway and twoway slabs university of asia pacific. Analysis and design of two way slabs page 4 simple beam, uniformly loaded by its share of q. Floor slab design floors are designed as slabs on grade. One way and two way slabs one way slabs transfer the imposed loads in one direction only. Tayabji regional manager ctl group report 053201 project 05320. The solution per ddm can be found in the twoway plate concrete floor system design example. The example presented here is for twoway posttensioned design. In two way slab, the ratio of longer span l to shorter span b is less than 2.

Reinforced concrete design 1 design of slab examples and. Zollinger program manager, rigid pavements texas transportation institute and shiraz d. Download our free two way slab design spreadsheet only from samotech. Twoway concrete floor slab with beams design and detailing csa a23.

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. Uniformly distributed load was considered, that represent almost practical cases. Design of a two way slabs for punching shear resistance. 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. Shrinkage and temperature reinforcement in twoway post. The slab is to be designed as a reinforced concrete two way slab supported on beams.

Only external walls 230 mm thick with 12 mm plaster on both sides are considered. Twoway slab analysis and design using equivalent frame method efm. In two way slabs, load will be carried in both the directions. The slab thickness depends on the type of loads on the floor slab. 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. They may be supported on two opposite sides only fig. The first reinforced concrete design manual formerly titled aci design handbook was developed in. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Posttensioned oneway slab pennsylvania state university. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa.

Aug 03, 2016 the design steps have been presented in the following question how do i degisn two way slab. Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. 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. Bending will take place in the two directions in a dishlike form. 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. Collection of civil engineering design spreadsheet. The design bending moment of two way restrained slab can be calculated as follows.

The rcc slab designing tool is developed by shankar toyal, student of indian institute of technology, bhubaneswar. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Slabs can be designed by direct design method known as ddm and another method for design is coefficient method which is the easier one. Twoway slabs structural engineering forum of india, sefi. Distribute moments transverse at critical sections to column and middlestrip and if. 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. 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 by direct design method as per aci 31811. The owcs was able to be integrated with the existing architectural design with minor architectural impact. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. Best practices of concrete pavement transition design and. 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.

Continuous one way slab figure 1 shows a clear area of 12 m x 8. Panel edge conditions analysis and design of slabs two way. 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 document is intended primarily for design engineers, but we shall be very pleased if it is also of use. Twoway slab analysis and design using elastic frame method efm. The basic design procedure of a twoway slab system has five steps. The committee is also aware of projects on which design professionals have specified temperature tendons between the bands in two way posttensioned slabs. Twoway slab design based on aci 31811 using finite. Estimates in building construction sample spreadsheet. Two way concrete slabs with openings experiments, finite element analyses and design piotr rusinowski.

Twoway slab example 1 beam structure classical mechanics. Difference between one way slab and two way slab system. Analysis and design of slabs two way civil engineers pk. 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. Basic steps in two way slab design choose layout and type of slab. Reinforced concrete design 1 design of slab examples. Bending will take place in the two directions in a dishlike fo. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. 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. Two way slabs have two way bending unlike one way slab. Design of reinforced concrete structures ii twoway slabs. How to design a twoway slab free download as powerpoint presentation. There are several methods by which twoway slabs can be designed. Oneway slabs transfer the imposed loads in one direction only.