European commission joint research centre institute for the protection and security of the citizen contact information address. The unit weight of reinforced concrete is assumed to be 24 knm3. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. 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. Beams of width and depth are provided on all column lines. 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.
The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. Ce 433, fall 2006 slab design example 1 6 design a one way slab for an exterior bay of a multistory office building using the information specified below. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be. Excel sheets are often very useful to determine the slab thickness and reinforcement detailing. The ratio lb which is less than 2 is known as two way slab. Shear force at short span, shear force at long span, where. Two way slab design by direct design method as per aci 31811. Reference 5 focused on analysis of two way ribbed slabs with. Twoway 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. One way and twoway slabs one way slabs transfer the imposed loads in one direction only.
The program covers wide range of twoway slab systems and can be used for more complex slab layouts. Download two way slab design excel sheet template for free. Design examples look at example 7 design of a flat plate floor without spandrel beams direct design method look at example 9 design of a twoway slab with beams in both directions. The slab is supported on beams of size 225 x 500 mm spaced at 4.
This method was provided in the american concrete institute aci in 1963 to design twoway slabs carried by steel beams, deep beam, or walls. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. 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 example, i n slab column system, which is located in dr y or constantl y wet environment xc1 by ec2, made of concrete c 4050 and with require ment for r ei120, and with unbounded bbrs 20mm. Accordingly, main reinforcement is required in the two directions. 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 lateral loads are independently resisted by shear walls. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. They may be supported on two opposite sides only fig. The program covers wide range of two way slab systems and can be used for more complex slab layouts. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa.
Example design of two way edgesupported solid slab. Design of a two way rcc slab structural engineering. Design of a two way slabs for punching shear resistance. Twoway slabs have two way bending unlike oneway slab. Two way slabs are normally supported from four sides. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Design of a two way rcc slab structural engineering forum.
Generally, there are two types of slab which are one way and two way slabs. Lb2 is one way slab lb download ebook, handbook, textbook, user guide pdf files on the internet quickly and easily. Two way slab design spreadsheets to eurocode 2 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. My graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete. Ce 433, summer 20 slab design example 1 5 design a one. Reinforced concrete design 1 design of slab examples and. Flat slab analysis, design and detailing pdf civil engineering. Two way slab design spreadsheet the engineering community.
The following example illustrates the example building. Chapter 3 design of rectangular beams and oneway slabs. Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Bending will take place in the two directions in a dishlike form. In twoway slabs shorter direction strip carry greater %age of load. Previous article one way slab design spreadsheets to eurocode 2 en 19921. Jun 14, 2017 download two way slab design excel sheet template. Chapter 3 design of rectangular beams and oneway slabs 12. Check the drop panel dimensional limitations as follows. In two way slabs shorter direction strip carry greater %age of load.
Two way slab being supported on four sides the load will be carried in both the directions. Time saving design aids twoway slabs page 6 of 14 the pca computer program pcaslab can be used to expedite the design of different slab systems. Load transfer in a one way slab, b two way slab nilson fig. Jan 18, 2014 it is always necessary to design a safe and load bearing capable slab. Ec2 webinar autumn 2016 lecture 52 designing for shear in slabs when shear reinforcement is not required e. Jul 22, 2015 my graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete.
Deflections of twoway slabs scholars mine, missouri. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Aci318 code provides two design procedures for slab systems. 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. It is always necessary to design a safe and load bearing capable slab. For example, i n slabcolumn system, which is located in dr y or constantl y wet environment xc1 by ec2, made of concrete c 4050 and with require ment for r ei120, and with unbounded bbrs 20mm. Joint research centre, via enrico fermi 2749, tp 480, 21027 ispra va, italy. Reinforced concrete design 1 design of slab examples. Continuous one way slab figure 1 shows a clear area of 12 m x 8. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Two way slab design spreadsheets to eurocode 2 en 19921. Two way slab design spreadsheets to eurocode 2 twoway spanning slabs for rectangular slabs with standard edge conditions and subject to uniformly distributed loads, normally the bending moments are obtained using tabulated coefficients. Twoway concrete slab with beams spanning between supports. Design of twoway floor slab system comparison of oneway and. 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. Two way slab design to aci free download and software.
Shear strength of twoway slabs shear failure occurs when inclined. Reference 5 focused on analysis of twoway ribbed slabs with. Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. 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. I have developed a microssoft excel software for design of a two way rcc slab. Two way slabs have two way bending unlike one way slab. 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. Apr 18, 2019 this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Dec 28, 2017 click here for latest videos check out my friends blog please send your house plans pdf files and house images ceiling. Design of reinforced concrete structures ii two way slabs 1 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. The ratio of the total costs was found to be within the range 1. It can be used by both practicing engineers and students. Oneway and twoway slabs university of asia pacific.
In this example, the latter option will be used to achieve better understanding for the design of two way slab with drop panels often called flat slab. 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. Design of two way floor slab system comparison of one way and two way slab behavior one way slabs carry load. Ec2 worked examples rev a 31032017 latest version page 8 foreword to commentary to eurocode 2 and worked examples when a new code is made, or an existing code is. Design of reinforced concrete structures ii twoway slabs. Analysis of two way ribbed and waffle slabs with hidden beams.
Analysis and design of slabs two way civil engineers pk. Excel sheet to design slab one way and two way all about. Twoway flat slab concrete floor with drop panels system. Slab is one of the most famous part of a construction project. Design of slabtwo way excel sheet online civilforum. This spreadsheet performs an analysis and design of twoway spanning reinforced concrete slab. Aci 31811 code provides two methods for two way slab design one of which is direct design method.
Typical lowrise building under construction the predominant direction in which the construction progresses, are used to demonstrate some general objectives to be. Two way slab design spreadsheets to eurocode 2 engineering. The output of the program for the slab in the example is shown in the following pages. Design of reinforced concrete structures ii twoway slabs 1 1. Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. Unless otherwise noted, all referenced table, figure, and equation. Load transfer in a oneway slab, b twoway slab nilson fig. Direct design method simplified method of analysis for regular two. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. Minimum of three continuous spans in each direction successive span lengths centre. Twoway 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. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. 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. How to design a twoway slab free download as powerpoint presentation.
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. The dimensions of an interior bay are shown in figure 1. This example goes through the design of a simplysupported oneway slab on beams. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown.
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