Design of slabs as per is 456 pdf

Check for deflection is as per the provsions in cl. With some limitations, reinforcement for slabs can be sized using the subgrade drag theory in order to increase the spacing of control or construction joints. Method of rcc slab design as per is 456 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. Application of limit state method to rectangular beams for flexure, shear, bond and torsion. Bending moment coefficients for two way restrained slabs table 26, is 456 2000 detailing requirements as per is 456 2000 a. The cross sections of the slabs and the method of testing are shown in figs. A finite element model may be created to analyse a complicated loading arrangement.

Design and detailing of rc deep beams as per is 4562000 1. Design of cantilever slab spreadsheet engineering books. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. So, we have a few more lecturers, so today we shall start part 1. Concrete slab design procedure7 design of continuous slab basics of reinforced concrete slab design slabs are generally designed on the assumption that they consists of a number of beams of breadth one. Design mix and nominal mix concrete in design mix, the proportions of cement, aggregates sand and gravel, water and. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Slabs where reinforcement with yield strength exceeding 60000 psi 0. Design of one way and two way slabs, design of staircases.

The maximum moments obtained using equations are apply only to middle strip. One way slab being supported on two opposite sides only leads to the structural action in single direction. Meridonal thrust per meter length of the dome at its base s base x x. Tensioning building structures march 12, 2020 2020 educode las vegas. Department of mechanics, materials and structures english. Simply supported two way slab design as per is 456. Specifications for design of footings as per is 456.

Design and detailing of rc deep beams as per is 4562000. Design considerations for reinforced concrete flat slab. This spread sheets is useful for design of cantilever slab as per is 456. Effective span first step is know the effective span for analysis and design effective span needed for calculation of moments, shear forces, etc. Dhang department of civil engineering indian institute of technology kharagpur lecture 14 design of slabs today, we shall start design of slabs.

Equivalent frame method most commonly used method the flat slab structure is divided longitudinally and transversely into frames consisting of columns and strips of slabs with. Sloping slabs under gravity load would be subjected to bending and axial thrust. If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as twoway restrained slab. Design of concrete domes as per is 456 abq consultants. Download code design of one way slabs as per is 456 worked step by. Aci 360, design of slabs ongrade, refers to this as a type b slab. These loads shall be applicable for the design of buildings. The effective span of a simply supported slab shall be taken as the lesser of the following. Reinforced concrete continuous beam analysis and design. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Pdf predicting the response of reinforced concrete slab exposed.

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 considered as divided in each direction into middle and end strips as shown below b. And this is your lecture number 14, design of slabs part 1. What are the design requirements of concrete slab design. Is 456 provides guidance to calculate effective span. The design of two way rectangular slabs supported on all four sides without provision for torsion at corners is carried out as per table 27, indian standard is 456 app. The design compressive strength of the concrete was 23. One way slab design procedure with example design of one. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is. Hence as per table 28 in is 4562000, effective length of column 1. Design of flat slab by direct design method has some restrictions that a it should have minimum three spans in each direction.

Civildigital quiz for civil engineers reinforced concrete design as per is456 design of reinforced concrete structures is456 recommendations part 2 test your knowledge on design of concrete elements as per is 456 concrete design code, prepare for gate, ies and other examinations. The following table gives the maximum values of the ratio of span to depth. Limit state of collapse and limit state of serviceability. Correlation between sbc and modulus of subgrade reaction. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. Aci 360, design of slabsongrade, refers to this as a type b slab. The minimum thickness can be determined by many factors. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. These books are used by students of top universities, institutes and colleges. The partial safety factors for loads, as per is 456. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. They are projections from wall face of lintel beams or floor slabs. Calculate the required reinforcement to resist the interior support negative moment. Calculation of approximate depth from deflection criteria cl 23.

Design considerations for reinforced concrete flat slab floor. The software autocad is used for drawings planning and for drawing reinforcement details of slabs, columns, beams, footings, etc. If the problem is statically determinate, the equilibrium equations would. Bending moment coefficients for two way restrained slabs table 26, is 4562000 detailing requirements as per is 4562000 a.

Maximum diameter of bars the diameter of the bar shall not exceed 18 of total thickness of the slab. Pdf the current provisions for fire rating of reinforced concrete slab as per. Table of contents reinforced concrete slab design guidelines a effective. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. Flexural design for this beam, the moment at the exterior face of the interior support governs the design as shown in the previous figure. Design of slabs today, we shall start design of slabs. Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. Pro you need to model the slabs using plate elements. Please read the lauses mentioned in the video while solving the problem. Based on the boundary condition, you can determine the axial thrust and the bending moment. Oneway and twoway slabs oneway slabs transfer the imposed.

A six storey building for a commercial complex has plan dimensions as shown in figure 1. Module 3 design of reinforced concrete deep beams introduction minimum thickness steps of designing deep beams design by is 456 detailing of deep beams. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Slabs are safe in shear nominal shear stress is very low since b is large therefore no shear reinforcement is provided in slabs except that the alternate bars are bent up near the supports. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. The design bending moment of twoway restrained slab can be calculated as follows. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Distance between the centers of bearings, clear span plus effective depth. Shear strength of beamless slabs usually a controlling factor. Design of two way slabs is 456 limit state method youtube. Slab designer as per is 4562000 free download as pdf file. Design of concrete domes as per is 456 1111 radius of dome. May 02, 2018 details language english duration 25 mins format.

Punching of flat slabs design for shear at th e column heads 12. Flat slab analysis, design and detailing pdf civil. Flat slab analysis, design and detailing pdf civil engineering. The present project deals with the analysis of a multistoried residential building. Design of one way slabs as per is 456 worked step by step.

These materials are originally located at different websites. Design of one way slabs as per is 456 worked step by. The detail method of slab modelling analysis design is mentioned here you can find an example file in the following location. Flat slab system is an important division of concrete floor system. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system. In this video deisgn of two way slabs has been covered using is 456. The trial depth is selected based on spandepth ratio of 7, as in is. Dec 20, 2017 in this video deisgn of two way slabs has been covered using is 456. We can take the effective span and we shall get it in clause 22. Here ratio of longer span of slab to the shorter span of slab is greater than 2. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Following are the rcc slab design and detailing guidelines. This condition occur when the slabs are connected monolithically with support. The maximum spacing of distribution reinforcement also restricted to 300 max by considering the construction practice in india.

Solving the equation, per m3 of concrete the quantitiy of. Before we start the design of slabs, let us see what our words says related to. Sep 16, 2015 this spread sheets is useful for design of cantilever slab as per is 456. A civil engineer must know all the aspects regarding the flat floor system. May 09, 2018 sloping slabs under gravity load would be subjected to bending and axial thrust. Reinforced concrete slab design and detailing guide is456. Slab designer as per is 4562000 civil engineering mathematics.

This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Usually balcony slabs are cantilever slab and hence a provision for wall load at free end is included so that the spread sheet is useful for practical purposes. Design spreadsheets flat slab system is an important division of concrete floor system. This is an example on how to design a rcc slab using is 4562000. Two span continuous deep beam with two point loading 2.