2 way slab design sample pdf documentary

The ratio lb which is less than 2 is known as two way slab. Analysis of two way ribbed and waffle slabs with hidden beams article pdf available in international journal for computational civil and structural engineering volume 4, no 3. 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. Analysis and design of slabs two way two way edge supported slabs twoway slabs. Analysis and design of slabs, one way slabs, online free slab design, design of slabs one way, free slab design online, design procedure for one way slab skip to content civil engineers pk. Concrete 3 design of concrete beam and slab twoway slab. Two way reinforced concrete slab design spreadsheet.

Design of reinforced concrete structures ii two way slabs 1 1. The same is true for a two way slab or any other floor system. Rectangular beams and oneway slabs page 2 of 9 two methods. In twoway prestressed slabs, many designers also provide a nominal grid of nonprestressed reinforcing steel typically no. Design of one way and two way slabs, design of staircases. Click to share on twitter opens in new window click to share on facebook opens in new window related posts. Example design combinations for deflection quasipermanent derived for typical uk.

This example goes through the design of a simplysupported oneway slab on beams. The pca computer program pcaslab can be used to expedite the design of different slab systems. 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. Several residential and office buildings which contain rooms have two way slab. Difference between one way slab and two way slab simple. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. What is the design of a one way slab and a two way slab. Twoway slab analysis and design aci 318 states that a slab system shall be designed by any procedure satisfying equilibrium and geometric compatibility, provided that strength and serviceability criteria are satisfied. Since the slab thickness hmi calculated in page 7 of this document is 12 in. Two way reinforced concrete slab design spreadsheet working. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. 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. Analysis and design of one way and two way slab in staad.

This method requires various formulas for different conditions of rc slab. Plan view of floor system assume partitions will not be damaged by deflections. Slab resting on walls or sufficiently deep and rigid beams on all sides. Bending will take place in the two directions in a dishlike form. A rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and. Twoway joist waffle slab design approach and methodology.

Design the concrete floor slab system shown below for an. Introduction in reinforced concrete construction, slabs are used to provide flat, useful surfaces. Bending will take place in the two directions in a dishlike fo. The following example illustrates the example building. Reinforced concrete design 1 design of slab examples and. Traditionally, the term flat slab has represented a solid uniform depth slab with thicker drop panels supported upon mushroom head conical capitals with round columns or various prismatic brackets with square columns. 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. Allowable stress design or working stress design wsd 2.

The design shear force of twoway restrained slab can be calculated as follows. 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. Direct design method of flat plates per aci 31802 twoway slabs are inherently difficult to analyze by conventional methods of statics because of the twoway bending occurring. 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. Two way reinforced concrete slab design spreadsheet working stress design coefficient method. Basic steps in two way slab design choose layout and type of slab. Analysis of two way ribbed and waffle slabs with hidden beams. All information in this document is deemed to be accurate by the european concrete platform asbl at the time.

Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Oneway and twoway slabs university of asia pacific. If the proportion of longer dimension of the slab panel to the shorter dimension is more than or equivalent to 2 then it is defined as one way slab. Design of a two way rcc slab structural engineering forum. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. All available load test results indicated that the flat plate or flat slab was a most efficient design with an adequate safety factor. Early codes distinguished between fourway reinforcement and twoway reinforcement systems. Design of concrete structures 14th edition, 2009, by arthur h. Two way slabs are normally supported from four sides.

Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. I have developed a microssoft excel software for design of a two way rcc slab. A simplified method for designing rc slabs under concentrated. Download our free two way slab design spreadsheet only from samotech. Chapter 3 design of rectangular beams and oneway slabs 12. Slabs are primarily categorized as either one way or two ways. Design of reinforced concrete components of a house. Such coefficients are provided later in this section. However, plastic method can be the best method for designing such cases of two way slabs. Chapter 3 design of rectangular beams and oneway slabs. Design spreadsheets in high rise buildings and skyscrapers, thinner, precast concrete slabs are slung between the steel frames to form the floors and ceilings on each level.

This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. Design of reinforced concrete structures ii twoway slabs 1 1. Assume partitions cannot be damaged by deflections. The basic design procedure of a two way slab system has five steps. Twoway slab analysis and design using elastic frame method efm. Yield line pattern for the general case of twoway slab. A brick wall of 250 mm thickness including plaster of 1.

On the technical drawings, reinforced concrete slabs are often abbreviated to. 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. Shear force at short span, shear force at long span, where. Two way joist waffle slab design approach and methodology 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. No certain method can be found in the design codes or references for designing two way slabs subjected to concentrated loads. How to design concrete structures using eurocode 2. Reinforced concrete slab design guidelines a effective span of slab. 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. Twoway flat plate concrete floor system analysis and design. Aci318 code provides two design procedures for slab systems.

A single slab with oneway reinforcement rebars will be analyzed with rcsolver. 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. A discreteelement method of multipleloading analysis for. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Teaching twoway ribbed slab analysis and design using the. Dissatisfaction with results of previously required procedures of analysis and design for two way slab beam systems was the original reason for the massive research upon two way slab systems begun about 1955. Reinforced concrete slab design and detailing guide is456. 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 and design of slabs one way civil engineers pk. Design of concrete structures as easy as possible by. The floor is to be designed to carry a service live load. Accurately determining the moments on a twoway slab is typically accomplished by finite element computer analysis. Accordingly, main reinforcement is required in the two directions.

Two way slabs have two way bending unlike one 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. One way and two way slab reinforcement in detail at sit duration. Stiffening wall systems ways of bracing rigidity of shear walls and bracing.

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. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for one way and two way slabs as per is following are the rcc slab design and detailing guidelines. The output of the program for the slab in the example is shown in the following pages. If, it is below 2 then it is described as two way slab. Analysis and design of slabs two way civil engineers pk.

Here ratio of longer span of slab to the shorter span of slab is greater than 2. Main reinforcement for two way slabs designs in both directions. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Generally, there are two types of slab which are one way and two way slabs. Bend length at the end of the reinforcement bar beam has to. The design details of all the columns are extracted. Ce 433, summer 20 slab design example 1 5 design a one. One way and twoway slabs one way slabs transfer the imposed loads in one direction only. Existing twoway slab design procedures the example structure a preliminary girder design structure details specified loadings a oneway design. This situation happen when slab were supported at all four. Flat plate concrete floor system does not use beams between columns or. One way slab being supported on two opposite sides.

An optimal plan geometry with all same supports is a square, based on load distribution into both directions. One way and two way slabs one way slabs transfer the imposed loads in one direction only. Advanced slab design mode enables concrete slabs defined with or without holes to be designed using the ramconcept or adaptbuilder software. Two way slab design spreadsheets to eurocode 2 engineering. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Rectangular beams and one way slabs page 2 of 9 two methods.

Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. Twoway slab example 1 beam structure classical mechanics. The program covers wide range of twoway slab systems and can be used for more complex slab layouts. In a oneway spanning slab the area of each bay exceeds 30 m2.

Two way slab design by direct design method as per aci 31811. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Twoway slabs have two way bending unlike oneway slab. The slab is supported on beams of size 225 x 500 mm spaced at 4. Design of reinforced concrete structures ii twoway slabs. Following are the rcc slab design and detailing guidelines. Analysis and design of twoway slabs page 1 chapter 3. 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. 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 slab one way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Preliminary design of slab thickness thickness design depends on boundary conditions supports. Check the adequacy of slab thickness for punching shear twoway. Twoway posttensioned slabs with unbonded tendons offer further advantages in the prevention of local or. Twoway concrete slab with beams spanning between supports. 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. These are the direct design method presented in chap. For designing two way slab refer is code 4562000 and sp16.

Two way reinforced concrete slab design spreadsheet working stress design coefficient method download spreadsheet. Example design of two way edgesupported solid slab. One way slab is supported by two parallel beams or walls. They may be supported on two opposite sides only fig. Load transfer in a oneway slab, b twoway slab nilson fig. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Twoway concrete floor slab with beams design and detailing csa a23. Design of a two way reinforced concrete slab with rcsolver software program according to eurocode 2 specifications. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. Throughout this document, the term joint is used to refer to a beamcolumn joint. Simple support at all sides ssss appropriate h s 1. Analysis and design of slabs two way two way edge supported slabs two way slabs.

Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Twoway slab analysis and design using equivalent frame method efm. Partitioning a twoway slab size of the model edge restraint springs. 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. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Distribute moments transverse at critical sections to column and middlestrip and if. Reinforced concrete design 1 design of slab examples. 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.