Two way rcc slab pdf

Two way slab being supported on four sides the load will be carried in both the directions. Please read the lauses mentioned in the video while solving the problem. Design a simply supported rcc slab for a roof of a hall 3. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Reinforced concrete design 1 design of slab examples and. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Reinforced concrete design to bs8110 structural design 1. The slab has to carry a distributed permanent action of 1. Design of reinforced concrete structures ii twoway slabs.

Redistribution of 10% may be allowed when method 3 or method 4 is adopted. The quantities of the materials are calculated and cost of construction for slabs are determined and compared. The two way slab is designed for both the directions as it bends in both directions. The one way and two way slab systems are the most commonly used floor system in the reinforced concrete structure. Click to share on facebook opens in new window click to share on twitter opens in new window click to email this to a friend opens in new window.

Analysis and design of slabs two way civil engineers pk. No redistribution is allowed when method 1 or method 2 of analysis in section 3. In two way slabs shorter direction strip carry greater %age of load. In this video deisgn of two way slabs has been covered using is 456. For b oth one way and two way slab with an example. Two way reinforced concrete slab design clear longer span of slab. Dec 20, 2017 in this video deisgn of two way slabs has been covered using is 456. Continuous beam if it is the other way, for end span with 1 end fixed and the other continuous.

Here are the steps for the design procedure for one way slab in steps. The solution per ddm can be found in the two way plate concrete floor system design example. A rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and. Please select the grade of concrete for twoway slab construction. Reinforcement detailing of reinforced concrete slabs. The aci 318 building code permits openings of any size in any new slab system, provided that an analysis is performed that demonstrates that both strength and. If the ratio of longer dimension of the slab panel to the shorter dimension is greater than or equal to 2 then it is designed as one way slab.

In two way slab, the ratio of longer span l to shorter span b is less than 2. Reinforced concrete, as a composite material, has occupied a. Bending will take place in the two directions in a dishlike fo. Generally, there are two types of slab which are one way and two way slabs. Floor openings in twoway slabs structural engineering forum of. Design of reinforced concrete structures ii two way slabs 1 1. In this post, we are going to explain how to calculate steel quantity for the slab.

May 02, 2017 two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as two way slab. Rcc structures design multiple choice questions and answers pdf free download for civil students. Twoway slab analysis and design using equivalent frame method efm. Pdf selection of economical span in rcc building researchgate. Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab. If playback doesnt begin shortly, try restarting your device. Twoway concrete floor slab with beams design and detailing. The basic design procedure of a twoway slab system has five steps. The two classifications are one way slab and two way slab.

One way and twoway slabs one way slabs transfer the imposed loads in one direction only. Design of a two way rcc slab structural engineering forum. Pdf strengthening of reinforced concrete twoway slabs. 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.

Introduction in reinforced concrete construction, slabs are used to provide flat, useful surfaces. Distribute moments transverse at critical sections to column and middlestrip and if. Reinforced concrete design 1 design of slab examples. Lecture series on design of reinforced concrete structures by prof. I have developed a microssoft excel software for design of a two way rcc slab. Long and short spans of a two way slab are l and l and load on. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. They may be supported on two opposite sides only fig. Two way reinforced concrete slab design clear longer span of slab please enter the longer span. Reinforced concrete slab design and detailing guide is456. Design of one way and two way slabs, design of staircases.

Slabs are usually used in floor and roof construction. Bending will take place in the two directions in a dishlike form. Unless otherwise noted, all referenced table, figure, and equation. There are two types of slab classification based on the direction of bending occurs in these slabs. Difference between one way slab and two way slab system. However, the complexity of the generalized approach. Dhang, department of civil engineering, iit kharagpur.

The effective depth d of two way slabs can also be assumed using cl. Unless otherwise noted, all referenced table, figure, and. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design procedure steps for one way slab slab design steps. Two way slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. In two way slab main reinforcement is provided along both direction. Pdf this work investigated the flexural strength and deformation of 14 twoway concrete slabs that were reinforced in two directions with babadua. Reinforced concrete slab design using the empirical method.

I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Corners of the two way slab lift up if the slab is not cast monolithically with the supports wallsbeams. This is a part of his project economic design of two way rcc slabs under prof s. From the study it is considered that post tension slab is more economical than two way slab. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. In two way slabs, load will be carried in both the directions. For such cases flat slab with column capitals is very well suited. Oneway and twoway slabs university of asia pacific. Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Two way slab design by direct design method as per aci 31811. The two way slab will deflect in a dish or saucerlike form under the action of loads. There are many different methods for analysis of two way reinforced concrete slabs.

The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. The basic design procedure of a two way slab system has five steps. Two way slabs have two way bending unlike one way slab. Oneway and twoway slabs oneway slabs transfer the imposed. Design of two way slabs is 456 limit state method youtube. The building is located in seismic zone iii on a site with medium soil. The development of these methods was a necessity due to different causes, such as inadequate maintenance, overloading of the reinforced concrete member, corrosion of the steel reinforcement and other different situations that appeared in time.

Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. For better view, please read this post in landscape mode if you are on the mobile device. Two way rcc slab designing excel sheet civil engineering. Analysis and design of two way slabs page 1 chapter 3. The following example illustrates the example building. For those who do not know what are the des ign requirements of a slab. Slab resting on walls or sufficiently deep and rigid beams on all sides. Designing for shear in slabs when shear reinforcement is not required e.

Twoway slab design panel select boundary condition of slab for upliftment of corners. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Slabs can be designed by direct design method known as ddm and another method for design is coefficient method which is the easier one. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers. If severe deflection limits are imposed, the two way slab will be most suitable, as the introduction of even moderately stiff beams will reduce deflections more than the largest reasonable column capital is able to. Two way rcc slab designing tool in microsoft excel developed by shankar tayal a 3rd year student of school of infrastructure, indian institute of technology, bhubaneswar. Determine moments at critical sections in each direction, normally the negative moments. What is the formula for taking load from two way slab for. According to the 1995 aci code, all two way reinforced concrete slab systems, including edge supported slabs, flat slabs, and flat plates, are to be analyzed and designed according to one unified method, such as direct design method and equivalent frame method. Efm is the most comprehensive and detailed procedure provided by the aci 318 for the analysis and design of two way slab systems where the structure is modeled by a series of equivalent frames interior and exterior on. The first reinforced concrete design manual formerly titled aci design handbook was developed in.

Oct032018 two way concrete floor slab with beams design and detailing csa a23. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. Reinforced concrete design to bs8110 structural design 1 lesson 5 5 4. The following example illustrates the design methods presented in the pca book simplified designreinforced concrete buildings of moderate size and height third edition. Carbon frp strips and glass frp laminates can be used to increase the flexural capacity of two way slabs to an. Following are the rcc slab design and detailing guidelines. Pdf babadua reinforced concrete twoway slabs subjected to. The choice between two way and beamless slabs for more normal situations is. No redistribution is allowed when method 1 or method 2 of analysis in.