In this video deisgn of two way slabs has been covered using is 456. Design of a two way rcc slab structural engineering. Two way reinforced concrete slab design clear longer span of slab please enter the longer span. Simply supported slab upliftment of corners continuous slab no upliftment. How to design a two way slab free download as powerpoint presentation. 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. Design of reinforced concrete structures ii twoway slabs.
Please enter the practically physible spacing for main steel of twoway slab based on summary. The two classifications are one way slab and two way slab. Reinforced concrete design to bs8110 structural design 1. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. Twoway joist concrete slab floor waffle slab system. Design of a two way slabs for punching shear resistance. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Design of reinforced concrete structures ii two way slabs 1 1. L center to center distance between the support b depth of slab. I have developed a microssoft excel software for design of a two way rcc slab. However main reinforcement bar and distribution bar in transverse direction. Mention the parameters governing slab moment coefficients and explain their effects on moment. Twoway concrete slab on beams floor analysis and design.
Reinforced concrete design to bs8110 structural design 1 lesson 5 6 4. One way slab being supported on two opposite sides only leads to the structural action in single direction. Design the slab system shown in figure 1 for an intermediate floor where the. 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. Guide to design of simply supported slabs design of rcc. Reinforced concrete design 1 design of slab examples. In this case the structural action of the slab is essentially one way. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. The following section consists mcq of rcc structures design on engineering. The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design.
Following are the rcc slab design and detailing guidelines. Moduleiii design of short and long columns with axial and eccentric loading, design of isolated column footing. 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. Here are the steps for the design procedure for one way slab in steps. Determine moments at critical sections in each direction, normally the negative moments at. Twoway slab design panel select boundary condition of slab for upliftment of corners. 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. Two way rcc slab designing excel sheet civil engineering.
Min and max reinforcement as a percentage of the gross csa. This is a part of his project economic design of two way rcc slabs under prof s. Design of reinforced concrete structures ii two way slabs two way edgesupported ribbed slabs design methods simplified design methods grashoff method marcus method egyptian code method direct design methodu0026quot. Two way slab design by direct design method as per aci 31811. For those who do not know what are the des ign requirements of a slab. Design procedure steps for one way slab slab design steps.
The design bending moment of twoway restrained slab can be calculated as follows. Design of reinforced concrete structures ii twoway slabs 1 1. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. The basic design procedure of a two way slab system has five steps. Edge supported two way slabs free pdf file sharing.
Limit state method design concepts singly reinforced sections bb reinforced sections t and l beams shear, bond and torsion design of beams and slabs axially loaded columns columns with uniaxial and biaxial bending design of staircases two way slabs circular slabs yield line theory and design of slabs foundations pt. The two classifications are oneway slab and twoway slab. Direct design method, that could have been named the direct analysis method because it determines or prescribes moments for different parts of the slab panel without the need to conduct structural analysis, is explained in the following sections. Distribute moments transverse at critical sections to column and middlestrip and if. Centretocentre of two external vertical legs of a link. Load transfer in a oneway slab, b twoway slab nilson fig. In two way slab, the ratio of longer span l to shorter span b is less than 2. 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. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Sep 02, 2011 design of reinforced concrete beams 2. Flat slab analysis, design and detailing pdf civil. Sep 15, 2019 in this video two way slab is design as per is. 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 thickness of slab.
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. The basic design procedure of a twoway slab system has five steps. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Oneway and twoway slabs university of asia pacific. Accordingly, main reinforcement is required in the two directions. Oneway and twoway slabs oneway slabs transfer the imposed.
Bending will take place in the two directions in a dishlike form. Twoway slabs for ml l l s two way slab design panel select boundary condition of slab for upliftment of corners. Calculation of approximate depth from deflection criteria cl 23. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. Reinforced concrete slab design and detailing guide is456. Dhang, department of civil engineering, iit kharagpur. Load transfer in a one way slab, b two way slab nilson fig.
One way slab and twofigure 1 way slab in figure 2a slab is supported on two opposite sides only. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. 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 thickness of slab. The lateral loads are independently resisted by shear walls. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Take the quiz and improve your overall engineering. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Seismic loads will be considered acting in the horizontal direction along either of the two. 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. The following design methods are used for the design of rcc structures. This book aims to provide fundamental understanding to the analysis and design of reinforced concrete structures according to. Slabs can be designed by direct design method known as ddm and another method for design is coefficient method which is the easier one. This condition occur when the slabs are connected monolithically with support. Lecture series on design of reinforced concrete structures by prof.
One way and twoway slabs one way slabs transfer the imposed loads in one direction only. Twoway concrete floor slab with beams design and detailing. 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. They may be supported on two opposite sides only fig. Both vertical and horizontal loads may be transferred from one member to another properly if the beams and slabs are designed succesfully. In figure 1b, tie is shown connecting the footings. How to design a twoway slab free download as powerpoint presentation.
Design of one way and two way slabs, design of staircases. Aci 31811 code provides two methods for two way slab design one of which is direct design method. The effective depth d of two way slabs can also be assumed using cl. Effective span of slab shall be lesser of the two 1. In two way slabs, load will be carried in both the directions. The load on the slab is carried by the short span in one direction.
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. Design of two way slabs is 456 limit state method youtube. Manual for the design of reinforced concrete building. Multiple choice questions on rcc structures design.
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