2 way slab design example pdf format

Slab is one of the most famous part of a construction project. There are several methods by which twoway slabs can be designed. Pdf design of reinforced concrete circular slabs by twoway. Design of slab examples and tutorials by sharifah maszura syed mohsin. Beams of width and depth are provided on all column lines. Assume partitions cannot be damaged by deflections. What are the difference between tender and contract documents. Determine moments at critical sections in each direction, normally the negative moments at. Ddm can be found in the twoway plate concrete floor system design example. Plan view of floor system assume partitions will not be damaged by deflections.

View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. These are the direct design method presented in chap. Design of the composite flooring slab with profiled sheets t153 ruukki for a residential building bachelorv whesis 2015. 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. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Design of two way ribbed slab 18 x 25 m clear span 1. Allowable stress design or working stress design wsd 2. Download two way slab design excel sheet template for free. Only the design of slab bridge will be used for illustration. In addition, the thickness h must not be less than aci 9. Structures design office lrfd design examples files pdfs.

Useful illustration example is presented in this study according to the. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples. 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. One way and twoway slabs one way slabs transfer the imposed loads in one direction only. Analysis and design of slabs two way civil engineers pk. Oneway and twoway slabs oneway slabs transfer the imposed. Twoway concrete slab with beams spanning between supports. Reinforced concrete design 1 design of slab examples. Two ways post tension slab design this book is example hand calculation for design post tension slab. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Design the concrete slab and calculate the required tensile reinforcement for the main and the secondary direction. Chapter 3 design of rectangular beams and oneway slabs. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be.

The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Click to share on twitter opens in new window click to share on facebook opens in new window related posts. Design of reinforced concrete structures ii twoway slabs 1 1. So on this post, youll be able to have a clue on how to design a 2 way spanning slab.

The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. Minimum thickness of two way slab as per aci 31811 for. The slab is supported on beams of size 225 x 500 mm spaced at 4. Moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000 5000 a floor slab in a building where stability is provided by shear walls in one direction ns. What is the design of a one way slab and a two way slab. The deflection of two way slab is based on a number of parameters for example the flexural stiffness of the slab which is the function of slab thickness. The k value used for floor slab design reflects the response of the subgrade under temporary elastic conditions and small deflections, usually 0. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. The construction and design of concrete slabs on grade.

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. Two way slab design by direct design method as per aci 31811. Adapt webinar introduction to two way post tensioned. Two way reinforced concrete slab design spreadsheet. 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 webinar will cover the following topics related to. Analysis of two way ribbed and waffle slabs with hidden beams. This earlier handbook format was a collection of design aids and illustrative examples, generated in the precalculator era. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of reinforced concrete structure one way slab presented by md. Next older post 1 comment for two way post tension slab design khmer language reply.

This webinar is intended as an introduction to posttensioned slab design using adaptptrcs equivalent frame method solution. Figure 2 top view of continuous rc circular twoway ribbed slab. Efm is the most comprehensive and detailed procedure provided by the aci 318 for the analysis and design of twoway slab systems where the structure is modeled by a series of equivalent frames interior and exterior on. Posttensioned concrete design spreadsheet program a pdh. This example goes through the design of a simplysupported oneway slab on beams. Slab design reading assignment chapter 9 of text and, chapter of aci31802. 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. Aci 31811 code provides two methods for two way slab design one of which is direct design method. Rectangular beams and oneway slabs page 2 of 9 two methods. Flat plate concrete floor system does not use beams between columns or. This paper focuses on analysis of twoway ribbed and waffle slabs with hidden beams. In two way slab, load is supported on four sides and proportion of longer span to shorter span is not more than 2.

Here ratio of longer span of slab to the shorter span of slab is greater than 2. Key changes in the 2019 edition of the aci building code. Twoway flat plate concrete floor system design structurepoint. Slab is a common term used to describe the structural elements such as floors and roofs where the thickness of the element is very small compared to the length and. Fanella, which appeared in the october 2001 edition of structural engineer magazine. For slabs without beams or drop panels 5 inches for slabs without beams but with drop panels 4 inches read section 9. One way slab one way slabs are such slabs in which the loads are shared only by the shorter direction of the slab.

Two way reinforced concrete slab design spreadsheet working stress design coefficient method download spreadsheet. A subsequent report established the feasibility of using posttensioning in slabonground construction and verified many of the brab assumptions. They may be supported on two opposite sides only fig. Summary and comparison of twoway slab design results. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Twoway concrete floor slab with beams design and detailing version. The basic design procedure of a twoway slab system has five steps.

Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Concrete mix design calculation for m20, m25, m30 concrete with. Welcome to the learn to design reinforced concrete one way slabs through examples course by engineering examples. The high accuracy in design calculations of structures is undesirable because. Collection of civil engineering design spreadsheet. The reinforced design manual concrete in accordance with aci 31811. For designing two way slab refer is code 4562000 and sp16. I have developed a microssoft excel software for design of a two way rcc slab. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. In 1965 the writer developed a complete, overall design system, later modified to conform, in format. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects.

Generally, there are two types of slab which are one way and two way slabs. In this article, it is assumed that slab thickness is determine but calculation of column and middle strips is explained in the. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. Twoway slabs have two way bending unlike oneway slab. Closed form equations have been driven by author for the purposes of analysis. One way slab being supported on two opposite sides. Bending will take place in the two directions in a dishlike form. Determine moments at critical sections in each direction, normally the negative. The following example illustrates the example building. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Learn to design reinforced concrete one way slabs through. The flexural stiffness of the slab is increased with increasing the thickness of the slab. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. Two way post tension slab design khmer language civil.

Design of a two way rcc slab structural engineering. Two way slab design to aci free download and software. How can you design a 2 way spanning slab and be able to know the reinforcement size to be used in your slab as well as the spacing needed when tieing your reinforcements. How to design two way slab with coefficient method in excel sheet. There are many methods that are used to analyze twoway slabs and the precision of these methods vary depending. Pdf slabs are the flooring systems of most structures including office, commercial. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Example design of two way edgesupported solid slab. Introcduction slab in which the deflected surface is predominantly cylindrical termed as oneway slabs spanning in the direction of curvature. The construction and design of concrete slabs on grade 2012 instructor. 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. 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. Pdf the article is about design of prestressed slabs.

Oneway and twoway slabs university of asia pacific. Code and commentary format one of the most apparent changes to the code and. In twoway slabs shorter direction strip carry greater %age of load. It shows possible solutions of twoway prestressed floors depending on different factors. Aci in 1963 to design twoway slabs carried by steel beams, deep beam, or walls. Unless otherwise noted, all referenced table, figure, and equation. The other ways of analysis of twoway slabs are the direct design method and the equivalent frame method. Reinforced concrete design 1 design of slab examples and. Design the roof slab, beam and column of house given in figure 1. Design of reinforced concrete structures ii two way slabs 1 1. This course covers the analysis and design of reinforced concrete one way slabs using aci code 31811. Design of twoway slab by coefficient method the constructor. In this example deflection will be calculated and checked to satisfy project deflection limits. Design of reinforced concrete structures ii twoway slabs.