Twoway concrete slab with beams spanning between supports. They may be supported on two opposite sides only fig. Please enter the practically physible spacing for main steel of two way slab based on summary. How to design a two way slab free download as powerpoint presentation.
In two way slabs shorter direction strip carry greater %age of load. Allowable stress design or working stress design wsd 2. One way slab design procedure with example design of one. I have developed a microssoft excel software for design of a two way rcc 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. Calculation of approximate depth from deflection criteria cl 23. Dec 20, 2017 in this video deisgn of two way slabs has been covered using is 456.
Design of reinforced concrete structures ii two way slabs 1 1. Bending moments coefficiens have been taking from the bs code. The building is located in seismic zone iii on a site with medium soil. In this paper the cost optimization of reinforced concrete two way slabs under uniformly distributed load with the. Twoway concrete floor slab with beams design and detailing. Reinforced concrete slab design and detailing guide is456. The following example illustrates the example building. The first reinforced concrete design manual formerly titled aci design handbook was developed in.
Design the slab following the provisions of the aci code. Design of reinforced concrete 10th edition pdf free download. The equations for the analysis have been obtained from the reinforced concrete designers handbook by reynolds and steedman. In two way slabs, load will be carried in both the directions. Further information was provided by dr w i simms and mr a way, both from. How to design a twoway slab free download as powerpoint presentation. Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by. However main reinforcement bar and distribution bar. Determine moments at critical sections in each direction, normally the negative moments at. Lecture series on design of reinforced concrete structures by prof. Dhang, department of civil engineering, iit kharagpur. One way and twoway slabs one way slabs transfer the imposed loads in one direction only. It is important to note, however, that the depth of a member is influenced not only by the span but by such variables as spacing, loads, support conditions, deflections, and clearance require.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Two way slab design based on aci 31811 using finite element method. Flat slab analysis, design and detailing pdf civil engineering. Generally, there are two types of slab which are one way and two way slabs. Reinforced concrete design to bs8110 structural design 1 lesson 5 6 4. The two classifications are one way slab and two way slab. Reinforced concrete design to bs8110 structural design 1 lesson 5 1 lesson 5. 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. If the problem is statically determinate, the equilibrium equations would. 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. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process.
In the layout you have to fix the column positions, the orientations of columns. Flat slab analysis, design and detailing pdf civil. Jun 14, 2017 download two way slab design excel sheet template. The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance with the design provisions of aci 31811, and is consistent with the format of sp1709. This is a part of his project economic design of two way rcc slabs under prof s. Reinforced concrete slab design using the empirical method. Two way slabs have two way bending unlike one way slab. Two way restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two way restrained slab. Besides being a medic, he loves blogging, and he always strives hard to share the highquality content with others. In this video deisgn of two way slabs has been covered using is 456.
In this article, i will discuss how to design one way slab with example. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Min and max reinforcement as a percentage of the gross csa. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Design procedure steps for one way slab slab design steps. When the ratio of long span to short span is less than 2, then the slab is known as a slab spanning in two directions or two way slab. Design of a two way rcc slab structural engineering forum. If 2 way spanning, there are two linear elastic methods of analysis of slabs, grillage and finite element. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Pdf reinforced concrete design reinforced concrete. Multistory buildings are very commonly seen in cities.
When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. Rectangular beams and one way slabs page 2 of 9 two methods. Design of two way slabs is 456 limit state method youtube. Mention the parameters governing slab moment coefficients and explain their effects on moment. Reinforced concrete design reinforced concrete design two way slabs design of two way slab moment coefficient method load transfer from two way slab bar detailing design example slab. However, the complexity of the generalized approach. 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. A bentup bar called as crank bar is provided to make rcc slab safe from compressive stresses. The principal idea of this paper concerns to use the isotropic perpendicular rc straight.
Introduction, definitions flat slabs are two way slabs supported by pointlike supports. Additionally the optimization of rc one way slabs has been proposed by 8. 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. Application of limit state method to rectangular beams for flexure, shear, bond and torsion. Rcc slab design is a free app for designing one way and two way reinforced concrete slab systems as per indian standards. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Manual for the design of reinforced concrete building. Member design reinforced concrete two way spanning. Download two way slab design excel sheet template for free. Reinforced concrete design to bs8110 structural design 1. Member design reinforced concrete two way spanning slab bs8110 v2015. The design bending moment of two way restrained slab can be calculated as follows. Reinforced concrete design 1 design of slab examples.
Based on the boundary condition, you can determine the axial thrust and the bending moment. Redistribution of 10% may be allowed when method 3 or method 4 is adopted. The framing beams are to join columns to each other. Design of reinforced concrete structures ii twoway slabs. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. Chapter 3 design of rectangular beams and oneway slabs 12. Please read the lauses mentioned in the video while solving the problem. The load on the slab is carried by the short span in one direction. 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 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. Twoway slab design static equilibrium of twoway slabs analogy of twoway slab to plank and beam floor section aa. The design bending moment of twoway restrained slab can be calculated as follows. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be a twoway slab.
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. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. 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. L center to center distance between the support b depth of slab. Design of a two way slabs for punching shear resistance. Rcc design and detailing could be performed for ten different boundary conditions option to save the design projects in local storage. Rcc structures design objective lab viva manual civil book. Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. This research introduces a new simple, efficient, and practical procedure to design the reinforced concrete rc circular slabs which have large diameters. In two way slab, the ratio of longer span l to shorter span b is less than 2. Caprani civil engineering design 1 analysis and design of slabs.
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. One way and two way slabs one way slabs transfer the imposed loads in one direction only. The basic design procedure of a two way slab system has five steps. Department of mechanics, materials and structures english. The slab has to carry a distributed permanent action of 1. The following design methods are used for the design of rcc structures. Please enter the practically physible spacing for main steel of twoway slab based on summary. Two way reinforced concrete slab design clear longer span of slab please enter the longer span. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Bending will take place in the two directions in a dishlike fo. Two way rcc slab designing excel sheet civil engineering.
Sloping slabs under gravity load would be subjected to bending and axial thrust. Time saving design aids 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. Distribute moments transverse at critical sections to column and middlestrip and if. That is, the load factor at which the uls moment equals the moment capacity. Before we start the design of slabs, let us see what our words says related to your. Bending will take place in the two directions in a dishlike form. Analysis and design of slabs two way civil engineers pk. 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.
Usually, when a slab is supported by a beam the support is considered to be pinned. Useful rcc slab design app with clean and intuitive user interface. Qaisar ali reinforced concrete design ii department of civil engineering, university of engineering and technology peshawar 3d model of the house in this building we will design a two way slab for rooms, a one way slab, beam and column for verandah 23. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Sci p300 composite slabs and beams using steel decking best. Construction of such tall buildings are possible only by going to a set of rigidly interconnected beams and column. In this case the structural action of the slab is essentially one way.
Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Two way slab design by direct design method as per aci 318 11, step by step procedure and limitations of direct design method for two way. Following are the rcc slab design and detailing guidelines. Furthermore, there is a lack of sufficient information and instructions are needed to design fibre strengthening of cutouts in existing concrete slabs. This condition occur when the slabs are connected monolithically with support. The effective depth d of two way slabs can also be assumed using cl. Pdf cost optimum design of reinforced concrete simply. Two way slab being supported on four sides the load will be carried in both the directions. So, we have to design of 1 way slab, design a simply supported rcc slab for a. Design of one way and two way slabs, design of staircases. Twoway concrete slab on beams floor analysis and design. Design the slab system shown in figure 1 for an intermediate floor where the.
Reinforced concrete design 1 design of slab examples and. Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Oneway and twoway slabs oneway slabs transfer the imposed. 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. For those who do not know what are the des ign requirements of a slab. This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23.
Design of reinforced concrete 10th edition pdf free. To see their result for this slab we will find the load factor. This method has been used extensively since 1963 for slabs supported at the. Behavior and reinforcement of one way slab the structural frame consists of four columns, two beams and one slab. Chapter 3 design of rectangular beams and oneway slabs. Slab is one of the most famous part of a construction project.
Here are the steps for the design procedure for one way slab in steps. Mar 10, 2018 design steps for rcc one way slab by prof. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design of concrete structures 14th edition, 2009, by arthur h. Design of a two way rcc slab structural engineering. Slabs can be designed by direct design method known as ddm and another method for design is coefficient method which is the easier one. 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. Continuous beam if it is the other way, for end span with 1 end fixed and the. Goodchild bsc, ceng, mciob, mistructe practical yield line design an introduction to the practical use of yield line theory in the design of economic reinforced concrete slabs, including examples of design of flat. A rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and. Flat plate concrete floor system does not use beams between columns or. Two way slab design spreadsheet the engineering community. No redistribution is allowed when method 1 or method 2 of analysis in section 3.
Effective span of slab shall be lesser of the two 1. This guide covers the design and construction of composite slabs and beams, and. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. Rcc structures design multiple choice questions and answers pdf free download for civil students. A six storey building for a commercial complex has plan dimensions as shown in figure 1. One way slab and twofigure 1 way slab in figure 2a slab is supported on two opposite sides only. Limit state of collapse and limit state of serviceability. 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 this is a part of his project economic design of two way rcc slabs under prof s.
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