Bending will take place in the two directions in a dishlike fo. Although the major reinforcement in one way slab span is in the short direction, yet at the corner, the moment is actual supported by beams at both directions. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. 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. Architectengineer to be a part of the contract documents, they shall be restated in. One way slab design procedure with example design of one. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan.
The pca computer program pcaslab can be used to expedite the design of different slab systems. I have developed a microssoft excel software for design of a two way rcc slab. Reinforced concrete design 1 design of slab examples and. Two way slabs have two way bending unlike one way slab. Design the concrete slab and calculate the required tensile reinforcement for the main and the secondary direction. Example calculations for this and all other example problems the following data from the canam united steel deck design manual and catalog of steel deck products will be used and are worked using lrfd methodology. The output of the program for the slab in the example is shown in the following pages. Design of a two way rcc slab structural engineering forum. In two way slabs shorter direction strip carry greater %age of load. The following example illustrates the design methods presented in the pca book simplified design.
They may be supported on two opposite sides only fig. Generally, there are two types of slab which are one way and two way slabs. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. 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 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. 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 two way slabs one way slabs transfer the imposed loads in one direction only. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Download code one way slab design procedures and design. Bridge approach slab analysis and design incorporating elastic soil support presented by.
The basic design procedure of a two way slab system has five steps. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. Tn342 design example 2way mondada 093090 adapt corporation. In a oneway spanning slab the area of each bay exceeds 30 m2. Example design combinations for deflection quasipermanent derived for typical uk reinforced concrete design. Design methods validated by experimental evidence for flat slabs supported on. Pdf shear in oneway slabs under concentrated load close. Slab with reinforcement with yield stress, f y, exceeds 60,000 psi measured at a yield strain of 0. Master of science and hereby certify that, in their opinion, it is worthy of acceptance.
Design of reinforced concrete structures ii twoway slabs. Reinforced concrete slab design and detailing guide is456. Temperature nonfire in buildings see bs en 199115 0. Rc slab design ec2 worked example bending reinforcement duration.
Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Chapter 3 design of rectangular beams and oneway slabs 12. Ce 433, summer 20 slab design example 1 5 design a one. Analysis and design of slabs two way civil engineers pk. Two way slab design by direct design method as per aci 31811. Preliminary design of slab thickness thickness design depends on boundary conditions supports. Columnsupported floors generally qualify as two way systems. The composite slab which has to be placed on a conference hall has been selected for this project. Twoway concrete slab with beams spanning between supports. The slab has to carry a distributed permanent action of 1. In this project, the design of composite slab and connection with the beam using shear connectors have been done using insdag design manual based on assumptions of eurocode4 and is.
Oneway slab design procedures and design example civil. Example of portion of slab to be included with beam or definition of. Design actions, shearing forces and bending moments 1. Minimum thickness of nonprestressed oneway slab normal weight. How to design concrete structures using eurocode 2. Effective span of slab shall be lesser of the two 1. A copy of the tables is provided in the appendix and also.
The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Shear in one way slabs under concentrated load close to support. Introcduction slab in which the deflected surface is predominantly cylindrical termed as one way slabs spanning in the direction of curvature. Designing of slabs depends upon whether it is a oneway or a two way slab, the end conditions and the loading. One way concrete slab design part 1 concept explained and minimum slab thickness. Pdf irregular flat slabs designed according to the structural. 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. Parameters include support conditions nine cases, span ratios lalb 0. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Bending will take place in the two directions in a dishlike form. Engineered solutions structural plate design guide 7 edition. Plan view of floor system assume partitions will not be damaged by deflections. Allowable stress design or working stress design wsd 2. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter.
The behaviour of reinforced concrete beam sections at ultimate loads has been explained in. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Example design of two way edgesupported solid slab. Oneway and twoway slabs oneway slabs transfer the imposed. For a twoway slab supported on beams these strips carry the load to the beams. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. To distribute flexural stresses and strains within the uhpc over a larger area. Design of oneway slab free download as powerpoint presentation. In this article, i will discuss how to design one way slab with example.
To make the slab design independent of the type of rail, we will place the wheel load 1 from the nominal face of the rail 1ft from the edge of the slab. Asc steel deck is leading the way in innovation with ongoing testing of. Furthermore, structurepoint neither makes any warranty expressed nor. Oneway and twoway slabs university of asia pacific. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. 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. 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. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3.
Oneway and two way slabs one way slabs transfer the imposed loads in one direction only. The load on the slab is carried by the short span in one direction. Twoway slabs structural engineering forum of india, sefi. These are the direct design method presented in chap. Design example of one way slab with detailing free download as pdf file.
However main reinforcement bar and distribution bar. Assume partitions cannot be damaged by deflections. 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 456. A six storey building for a commercial complex has plan dimensions as shown in figure 1.
Analysis of two way ribbed and waffle slabs with hidden beams. 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. 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. An optimal plan geometry with all same supports is a square, based on load distribution into both directions. Design of reinforced concrete structure one way slab presented by md. Beams of width and depth are provided on all column lines. Twoway slab analysis and design using equivalent frame method efm. Design example of one way slab with detailing scribd. Aci 360, design of slabsongrade, refers to this as a type b slab. There are some basic steps which we generally do while designing theoretically some steps are rcc slab design guidelines. Design of reinforced concrete structures ii two way slabs 1 1. To make the superstructure continuous for live load. For a detailed discussion of one versus two way systems, refer to aalami.