Nnnntwo way slab design by coefficient method pdf

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. Two way reinforced concrete slab design spreadsheet. The pca computer program pcaslab can be used to expedite the design of different slab systems. Two way reinforced concrete slab design spreadsheet working stress design coefficient method download spreadsheet. Pdf deflection estimation of twoway edgesupported slabs. Plan view of floor system assume partitions will not be damaged by deflections. A discreteelement method of multipleloading analysis for twoway bridge floor slabs by john j. Bending will take place in the two directions in a dishlike form. Twoway slabs have two way bending unlike oneway slab. Oneway and twoway slabs oneway slabs transfer the imposed. However, plastic method can be the best method for designing such cases of twoway slabs. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Oneway and twoway slabs university of asia pacific. The construction and design of concrete slabs on grade.

Analysis and design of slabs two way civil engineers pk. Asce, secb course content slab on grades construction. The ratio lb which is less than 2 is known as two way slab. In this video deisgn of two way slabs has been covered using is 456. Design of two way slab moment coefficient method bnbc 1993. If slab is supported on all four sides and r shorter side longer side pdf available april 2009 with 10,441 reads how we measure reads. Two way slab design spreadsheet working stress design coefficient method. The output of the program for the slab in the example is shown in the following pages. 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. Chapter 3 design of rectangular beams and oneway slabs. Design of twoway slab by coefficient method the constructor. In which code book are the bending moment coefficients for. No certain method can be found in the design codes or references for designing twoway slabs subjected to concentrated loads.

Click to share on twitter opens in new window click to share on facebook opens in new window related posts. Design of two way slab by usd method and wsd method slab 1 case 2 slab dimension short span,a 20 long span,b 22 m ab 0. The accuracy of these methods depends on the assumptions that are stated in the method procedure. Allowable stress design or working stress design wsd 2. These are the direct design method presented in chap. The coefficient method is a method of designing twoway slabs that are supported by edge beams. The procedure of the design of twoway slabs will have all the six steps mentioned in sec. Twoway slab analysis and design using equivalent frame method efm aci 318 states that a slab system shall be designed by any procedure satisfying equilibrium and geometric.

Two way slab design by direct design method as per aci 31811. 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. All available load test results indicated that the flat plate or flat slab was a most efficient design with an adequate safety factor. A discreteelement method of multipleloading analysis for. Recommendations use method 2 or method 3 generally. In twoway slabs shorter direction strip carry greater %age of load. 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. Slabs are primarily categorized as either one way or two ways.

Design of two way slabs is 456 limit state method youtube. Civilax is the knowledge base covering all disciplines in civil engineering. Generally, there are two types of slab which are one way and two way slabs. Two way slab design spreadsheet working stress design. Accordingly, main reinforcement is required in the two directions. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Twoway slab design using the coefficient method beam. This method depends on determining the moments in the frames using coefficients. Analysis of slabs spanning in two directions under. Shear strength of beamless slabs usually a controlling factor. Following are the rcc slab design and detailing guidelines. Please read the lauses mentioned in the video while solving the problem. The following example illustrates the example building.

Rectangular beams and oneway slabs page 2 of 9 two methods. Panak hudson matlock research report number 56 development of methods for computer simulation of beamcolumns and gridbeam and slab systems research project 356356 conducted for the texas highway department. But, with proper application and enough safety factor yield line method. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Cornell university, david darwin university of kansas, charles dolan university of wyoming 3. Two way slab design spreadsheets to eurocode 2 en 19921. This method requires various formulas for different conditions of rc slab. In the sixties and seventies, i used the the text book theory of plates and shells by timoshenko. Then, the frame moments are distributed to the beam and the slab using tables. Twoway slab analysis and design using elastic frame method. One way slab oneway slabs are those slabs with an aspect ratio in plan of 2. The construction and design of concrete slabs on grade d. Twoway slab design coefficient method tables architectural. Coefficient method journal of the civil engineering division, the institution of engineers, ba ngladesh, vol.

Analysis and design of slabs one way civil engineers pk. Oneway slab design spreadsheet civil engineering community. Direct design method ddm for slab systems with or without beams loaded only. However, it should be known that the coefficient method is still applied for two way slabs. Okay, i know it is based on upper bound thorem and the solution might be unsafe. Twoway slab design using the coefficient method free download as pdf file. Previous article one way slab design spreadsheets to eurocode 2 en 19921. Flat plate concrete floor system does not use beams between columns or.

Design of reinforced concrete structures ii twoway slabs. Reinforced concrete slab design and detailing guide is456. Method 2 yieldlines may be successfully used for uniformly loaded slab panels with different boundary conditions. Introduction concrete slabs on grade are a very common type of concrete construction. The most common method is the aci direct design method. The analysis of rectangular twoway slabs subjected to concentrated load uniformly distributed over defined area after dispersion down in the two directions to the reinforcement is a practically important case. 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. Method 2 gives a better rep resentation of internal forces in a slab panel than method i. 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. We assume that the verandah slab is a two way slab instead of one way slab in order to calculate mb,neg now, using moment coefficient method for analysis. The program covers wide range of twoway slab systems and can be used for more complex slab layouts. Mention the parameters governing slab moment coefficients and explain their effects on moment.

Types of one way slab one way slab may be solid hollow ribbed 6. Difference between one way slab and two way slab simple. 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. Two way slabs are normally supported from four sides. 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. Best is subjective, so i will give my opinion here. Direct design method alias ddm as well as coefficient method are used to design the slabs. As presented by egyptian code for design and construction of concrete structures eccs 2032007, the analysis of this problem can be. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.