Design of two way ribbed slab 18 x 25 m clear span 1. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. The basic design procedure of a twoway slab system has five steps. 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. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition. Beams of width and depth are provided on all column lines. Reinforced concrete slab design using the empirical method. Plan view of floor system assume partitions will not be damaged by deflections. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.
Twoway slabs have two way bending unlike oneway slab. Left click save target as and save the file to a desired folder on users computer. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Generally, there are two types of slab which are one way and two way slabs. The program covers wide range of twoway slab systems and can be used for more complex slab layouts. Simple span reinforced concrete slab bridge rating example.
Determine moments at critical sections in each direction, normally the negative. The building is located in seismic zone iii on a site with medium soil. The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance with the design provisions of aci 31811, and is consistent with the format of sp1709. 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. Concrete 3 design of concrete beam and slab twoway. Simplified web based reinforced concrete structural design which is free. 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. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. They may be supported on two opposite sides only fig. Aci 31811 code provides two methods for two way slab design one of which is direct design method. View test prep concrete 3 design of concrete beam and slab twoway slab part 22 from engineerin 101 at royal melbourne institute of technology. One way and twoway slabs one way slabs transfer the imposed loads in one direction only.
Design of reinforced concrete structures ii two way slabs 1 1. Title reinforced concrete slab design using the empirical method publication no. Allowable stress design or working stress design wsd 2. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. In this article, it is assumed that slab thickness is determine but calculation of column and middle strips is explained in the. These are the direct design method presented in chap. For design, the approximate elastic or strip method for slab bridges found in. 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. The following example illustrates the example building. In the strength design method, the service loads are increased sufficiently by factors in order to obtain the load at which teaching twoway ribbed slab analysis and design using the mathcad program mohammed s. Typically, the soil support under the approach slab is ignored in the design and the approach slab is designed as a one way slab bridging the length between the integral. The slab has to carry a distributed permanent action of 1. All available load test results indicated that the flat plate or flat slab was a most efficient design with an adequate safety factor. Flat plate concrete floor system does not use beams between columns or.
Preliminary design of slab thickness thickness design depends on boundary conditions supports. Oneway and twoway slabs oneway slabs transfer the imposed. University of engineering and technology peshawar lecture lecture equivalent frame method by. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Twoway posttensioned slabs with bonded tendons by kenneth b. Right click the excel icon for the appropriate jurisdiction. Design of a two way rcc slab structural engineering.
This entry was posted in excel sheets and tagged excel sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by civilengineerspk. Oneway and twoway slabs university of asia pacific. Design of reinforced concrete structures ii twoway slabs 1 1. Assumptions for flexure theory and two way slab 28april2017. Notes author staff bridgesight software sponsor bridgesight software.
One way slab design excel sheet civil engineers pk. Design of reinforced concrete structures ii twoway slabs. Bss090119991 abstract this design example illustrates the empirical design method for composite concrete bridge decks specified in article 9. Dissatisfaction with results of previously required procedures of analysis and design for twoway slabbeam systems was the original reason for the massive research upon twoway slab systems begun about 1955. Twoway concrete slab with beams spanning between supports. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. The pca computer program pcaslab can be used to expedite the design of different slab systems. Analysis and design of slabs two way civil engineers pk. What is the design of a one way slab and a two way slab.
Slab design reading assignment chapter 9 of text and, chapter of aci31802. Design of oneway slab free download as powerpoint presentation. There are many methods that are used to analyze twoway slabs and the precision of these methods vary depending. Teaching twoway ribbed slab analysis and design using the. 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. In twoway slabs shorter direction strip carry greater %age of load. Assume partitions cannot be damaged by deflections. Shear strength of twoway slabs shear failure occurs when inclined. Comprehensive design example for prestressed concrete psc girder superstructure bridge design step 7 design of substructure design step 7. Here ratio of longer span of slab to the shorter span of slab is greater than 2.
No redistribution is allowed when method 1 or method 2 of analysis in. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Slab is one of the most famous part of a construction project. This is the case, for example, if the support has a large minimum width compared to the slab thickness or the. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Bridge approach slab analysis and design incorporating elastic soil support presented by. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. Analysis of two way ribbed and waffle slabs with hidden beams. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Reinforced concrete slab design and detailing guide is456. The output of the program for the slab in the example is shown in the following pages.
The bearing of the slab on the supporting walls may be taken as. Two way slabs have two way bending unlike one way slab. 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. Oneway simply supported slab, span length, l 10 ft normal weight concrete unit weight 145 pcf, 60 grade steel, fy 60,000. The superimposed load on the slab is to be 3500 n per square metre. Summary of bill of quantities civil works bar bending schedule.
Download two way slab design excel sheet template for free. The dimensions of an interior bay are shown in figure 1. The twoway slab shown in figure below has been assumed to have a thickness of 7. Rectangular beams and oneway slabs page 2 of 9 two methods. Bending will take place in the two directions in a dishlike form.
In two way slabs shorter direction strip carry greater %age of load. Engineering force ltd project 54 russell road, london job ref. Two way slab design by direct design method as per aci 31811. Comprehensive design example for prestressed concrete psc. One way slab design excel sheet, all civil engineering spreadsheets available on. What are the difference between tender and contract documents. Asc steel deck is leading the way in innovation with ongoing.
I have developed a microssoft excel software for design of a two way rcc slab. A six storey building for a commercial complex has plan dimensions as shown in figure 1. 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. One way slab being supported on two opposite sides.
Reinforced concrete design 1 design of slab examples and. Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Recommendations for finite element analysis for the design. A discreteelement method of multipleloading analysis for twoway bridge floor slabs by john j. One way slab one way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Direct design method ddm for slab systems with or without beams loaded only. Chapter 3 design of rectangular beams and oneway slabs. This paper focuses on analysis of twoway ribbed and waffle slabs with hidden beams. Design of one way reinforced concrete slabs class notes and example notes on. 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. 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.
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