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