Design of slab examples and tutorials by sharifah maszura syed mohsin. Guide to design of simply supported slabs design of rcc. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Sep 04, 2014 10 design of oneway solid slabs reinforcement, 2. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. 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. Chapter 3 design of rectangular beams and oneway slabs.
Reinforced concrete slab design using the empirical method. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. One way slab oneway slabs are those slabs with an aspect ratio in plan of 2. Nov 27, 20 one way slab design criteria with design example according to aci code slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. There are some basic steps which we generally do while designing theoretically some steps are rcc slab design guidelines. If slab is supported on all four sides and r shorter side longer side desi gn of slabs assumes that the slab thickness has previously been determined during conceptual design. Mar 07, 2017 rcc slab design depends on the on the dimensions of the slab after which the slab is termed as a oneway slab or a twoway slab in the design of rcc structures, column design and beam design are to be done before we start with rcc slab design basic rules followed in the design of simply supported slab. The basic design procedure of a twoway slab system has five steps. The dimensions of an interior bay are shown in figure 1.
Continuous oneway solid slab concrete structures eurocode. Once design compressive strength of concrete and yield stress of reinforcement are specified, the next steps are followed. One way slabs are those supported continuously on the two opposite sides so that the load sare carried along one direction only. The ratio of the total costs was found to be within the range 1. A typical sixspan, one way slab supported on beams,as occurs in parking structures is selected. A 175 mm thick continuous slab is required to support screed, finishes, an office variable action of 2. Request pdf analysis and deflections of reinforced concrete flat slabs the results of a test. Determine the allowable unform live load that a one way slab can sustain 3. The design objective was to design and visualize a cup with an integrated handle in the cup for knappe koppen sc. Crosssectional areas of the floor beams and girders are 14. One concept was chosen with the feedback of the client. Hence, after yielding of the reinforcement in a slab, a normal elastic analysis does not. The design shear force v d is below the maximum punching strength v rd,max. A single slab with oneway reinforcement rebars will be analyzed with rcsolver.
The slab is supported on beams of size 225 x 500 mm spaced at 4. 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. Design a simply supported one way slab subjected to dead and live loads 4. This example is to be used for educational purposes only. D mm d 105 mm loads on slab self weight of slab 3. Oneway and twoway slabs oneway slabs transfer the imposed. Calculate the design moment strength of a one way slab 2.
Design of reinforced concrete structures ii twoway slabs. Bridge approach slab analysis and design incorporating elastic soil support presented by. Example design of two way edgesupported solid slab. One way slab is the most basic and common type of slab. 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. Twoway concrete slab with beams spanning between supports. Reinforced concrete design 1 design of slab examples.
Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Reference 5 focused on analysis of two way ribbed slabs with. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. Slabs are usually used in floor and roof construction. Analysis and design of slabs two way civil engineers pk. 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. If slab is supported on all four sides and r shorter side longer side one way slab. Accordingly, main reinforcement is required in the two directions. Learn to design reinforced concrete one way slabs through. The various forms and types of the oneway systems are tabulated below. This calculation is intended to show in detail the provisions of designing a slab to eurocode 2 using essentially the same slab as used in example 3.
Design procedure steps for one way slab slab design steps. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Footings example 1design of a square spread footing of a seven. Effective span of slab shall be lesser of the two 1. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Rectangular beams and one way slabs page 3 of 9 design of rectangular beams and one way slabs continued a.
Load transfer in a one way slab, b two way slab nilson fig. Oneway and two way slabs one way slabs transfer the imposed loads in one direction only. This could be for example more concrete or steel reinforcement. Beams, see lecture 3 punching shear requirements e. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. The direction in which the load is carried in one way slab is called the span. Assume partitions cannot be damaged by deflections. Design of reinforced concrete structures ii twoway slabs 1 1. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Reinforced concrete slab design and detailing guide is456. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building.
Design example of one way slab with detailing scribd. Generally, there are two types of slab which are one way and two way slabs. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. Beams of width and depth are provided on all column lines.
Here are the steps for the design procedure for one way slab in steps. If a slab is supported on all the four sides but the ratio of longer span to shorter span is greater than two, the slab will be considered as a oneway slab. If playback doesnt begin shortly, try restarting your device. Minimum thickness of one way ribbed slabs summary of one way ribbed slab design procedure. The following example illustrates the example building. Types of one way slab one way slab may be solid hollow ribbed 6. Whatever may be the width of the slabs it should always be designed for a width of equal to one metre and the same design should be adopted for the rest of the slab. Bending will take place in the two directions in a dishlike form. 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 slab design aspect the slab provides a horizontal surface and is usually supported by columns,beams or walls. Slab shear strength twoway shear check the adequacy of slab thickness for punching shear twoway shear at an interior column figure 4.
Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. To find the elastic and plastic method of reinforced concrete slab analysis utilizing. 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. Design of reinforced concrete structures ii two way slabs 1 1. 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. 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. Footings example 1design of a square spread footing of a sevenstory building. Mathematical structural analysis of one way ribbed slabs was introduced in this paper. An introduction to the practical use of yield line theory in the design of economic. For those who do not know what are the des ign requirements of a slab. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects.
Following are the rcc slab design and detailing guidelines. If you continue browsing the site, you agree to the use of cookies on this website. Plan view of floor system assume partitions will not be damaged by deflections. Suggesting deflection expressions for rc 2way slabs. More detailed advice on determining design li fe,actions, material properties, methods of analysi s. Slab with reinforcement with yield stress, f y, exceeds 60,000 psi measured at a yield strain of 0. One of the first components of a bridge that you will design is the deck. Slabs having supports on less than four sides can be designed as one way. Analysis of two way ribbed and waffle slabs with hidden beams. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Two way slab design by direct design method as per aci 31811. Distribute moments transverse at critical sections to column and middlestrip and if.
If a slab is supported on all the four sides but the ratio of longer span to shorter span is greater than two, the slab will be considered as a one way slab. Reinforced concrete design 1 design of slab examples and. 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. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. In sap program, the model has been divided to frame elements to represent ribs and beams and shell elements to represent the slab and solid part. Aug 15, 2016 download code one way slab design spreadsheet. 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. In many cases the slabs are of such proportions and are supported in such way that twoway action. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Guidelines for a oneway concrete flooring system brewer. This design example illustrates the empirical design method for. They may be supported on two opposite sides only fig.
Ultimate load capacity of reinforced concrete slab. The ratio of length to width of one slab should less than 2 otherwise oneway action is obtained, even though supports are provided on all sides. The basic design procedure of a two way slab system has five steps. Videos you watch may be added to the tvs watch history and influence tv recommendations. Design example of one way slab with detailing free download as pdf file. The two classifications are oneway slab and two way slab.
Chapter 3 design of rectangular beams and oneway slabs 12. Analysis and design of slabs one way civil engineers pk. The various forms and types of the one way systems are tabulated below. Two way slabs have two way bending unlike one way slab. Oneway and twoway slabs university of asia pacific. We believe that the quickest way to learn is by actual application of the information. As an example, the formula for oneway spanning slabs supporting uniformly distributed. Twoway slabs are surface members acting in a both directions. 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.
Example load distribution problem 7 the floor system of a library consists of a 6in thick reinforced concrete slab resting on four floor steel beams, which in turn are supported by two steel girders. Due to the huge difference in length, load is not transferred along the longer direction. Pdf design calculation design of one way slab slab s1. Point load this problem is designed to demonstrate how to check the ability of a composite slab to carry a 3000 lb point load over an area of 4. In two way slabs shorter direction strip carry greater %age of load. The design procedure for a uniformly loaded one way reinforced slab can be divided in the following steps. The results of this analysis are compared with the results of the finite element method by sap program. I have developed a microssoft excel software for design of a two way rcc slab.
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