Static equilibrium of two way slabs total moment in both beams full load was transferred eastwest by the planks and then was transferred northsouth by the beams. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Standard deviation for compressive strength of concrete with example pdf. Bending will take place in the two directions in a dishlike fo. Load paths, one and two way slabs structural concepts and design duration. This method requires various formulas for different conditions of rc slab. It shows possible solutions of two way prestressed floors depending on different factors. Aci318 code provides two design procedures for slab systems. 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. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan.
One way concrete slab design part 2 area of tension steel canadian code duration. The two classifications are one way slab and two way slab. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given. Design of a two way slabs for punching shear resistance. Rectangular beams and one way slabs page 2 of 9 two methods.
In two way slabs, load will be carried in both the directions. Such a grid of beams reduces the span of the slab and thus permits the designer to reduce the slab thickness. Jul 10, 2017 this example goes through the design of a simplysupported one way slab on beams. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. In this video deisgn of two way slabs has been covered using is 456. In two way slab, the ratio of longer span l to shorter span b is less than 2.
There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. 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. Design of slabtwo way excel sheet online civilforum. What are the difference between tender and contract documents. Design of twoway slab by coefficient method the constructor. Beams of width and depth are provided on all column lines. Please read the lauses mentioned in the video while solving the problem. The example presented here is for twoway posttensioned design. 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. The slab is supported on beams of size 225 x 500 mm spaced at 4. Two way edgesupported slabs two way edgesupported slabs. 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. Foreword this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab.
From the study it is considered that post tension slab is more economical than two way slab. How to design a two way slab free download as powerpoint presentation. Bend length at the end of the reinforcement bar beam has to be. The following example illustrates the design methods presented in the pca book. Design procedure steps for one way slab slab design steps.
Two way joist waffle slab design approach and methodology two way joist slab often called two way ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. Pdf the article is about design of prestressed slabs. Member design reinforced concrete two way spanning. Chapter 3 design of rectangular beams and oneway slabs. 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. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Alternate design method design procedure of twoway slabs.
This is a part of his project economic design of two way rcc slabs under prof s. Accordingly, main reinforcement is required in the two directions. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. The following example illustrates the example building. This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Design of reinforced concrete structures ii two way slabs 1 1. When a rectangular slab is supported on all the sides and the lengthtobreadth ratio is less than two, it is considered to be a two way slab. This data is good for know the difference between one way slab and two way slab but if u provide to how to reinforcement design in one way and two way slab so its very helpfull. A simplified method for designing rc slabs under concentrated. The other ways of analysis of twoway slabs are the direct design method and the equivalent frame method.
Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Two way slab design by direct design method as per aci 31811. Flat slab analysis, design and detailing pdf civil. In the design of concrete slabs with openings the building codes propose. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Generally, there are two types of slab which are one way and two way slabs. Here are the steps for the design procedure for one way slab in steps. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Reinforced concrete design 1 design of slab examples. F is the total design ultimate load on the strip of slab between adjacent columns considered 1. Tributary areas many floor systems consist of a reinforced concrete slab supported on a rectangular grid of beams. Member design reinforced concrete two way spanning slab bs8110 v2015.
Two way slab design to aci free download and software. The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. Two way rcc slab designing excel sheet civil engineering. Two way 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. 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. View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples. 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. The method is based on the lower bound theorem of plasticity, meaning that a design based on the strip method is always safe. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. In future we may expand it for this type of work but it may take time. Twoway slabs structural engineering forum of india, sefi. Twoway slab design based on aci 31811 using finite element method.
Design of a two way rcc slab structural engineering forum. Analysis and design of two way slabs page 4 simple beam, uniformly loaded by its share of q. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. Slab resting on walls or sufficiently deep and rigid beams on all sides. Download two way slab design excel sheet template for free. Oneway and twoway slabs oneway slabs transfer the imposed. Several residential and office buildings which contain rooms have two way slab. The design shear force of twoway restrained slab can be calculated as follows.
Twoway slab analysis and design using equivalent frame method efm. Oneway and twoway slabs university of asia pacific. Stiffening wall systems ways of bracing rigidity of shear walls and bracing. So, main reinforcement is provided in both direction for two way slabs. Analysis and design of slabs two way civil engineers pk. Reinforced concrete design 1 design of slab examples and. The first reinforced concrete design manual formerly titled aci design handbook was developed in. Flat plate concrete floor system does not use beams between columns or. They may be supported on two opposite sides only fig.
Concrete 3 design of concrete beam and slab twoway slab. Panel edge conditions analysis and design of slabs two way. For those who do not know what are the des ign requirements of a slab. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. Difference between one way slab and two way slab system. Pdf slabs are the flooring systems of most structures including office. Two way slab design spreadsheet the engineering community. The basic design procedure of a two way slab system has five steps. Two way reinforced concrete slab design spreadsheet working stress design coefficient method.
Multi storey, post tension, two way, design, comparison. Designing of slabs depends upon whether it is a oneway or a two way slab, the end conditions and the loading. Analysis and design of slabs two way two way edge supported slabs two way slabs. Two way reinforced concrete slab design spreadsheet working. All methods are viable provided that the safety and serviceability of the elements are within the acceptable limits. Plan view of floor system assume partitions will not be damaged by deflections.
Analysis of two way ribbed and waffle slabs with hidden beams article pdf available in international journal for computational civil and structural engineering volume 4, no 3, 2014 january. 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. In the strength design method, the service loads are increased sufficiently by factors in order to obtain the load at which teaching two way ribbed slab analysis and design using the mathcad program mohammed s. There are several methods by which two way slabs can be designed. Oneway slabs transfer the imposed loads in one direction only. Analysis of two way ribbed and waffle slabs with hidden beams. If, it is below 2 then it is described as two way slab. Assume partitions cannot be damaged by deflections. Structures design office lrfd design examples files pdfs. The floor is to be designed to carry a service live load and a dead load on the slab due to selfweight plus weight of. I have developed a microssoft excel software for design of a two way rcc slab. Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Here the slab or slab panel is supported along its four edges by relatively deep, stiff, monolithic concrete beams or walls or steel girders.
If the proportion of longer dimension of the slab panel to the shorter dimension is more than or equivalent to 2 then it is defined as one way slab. The distribution of floor loads on floor beams is based on the geometric configuration of the beams forming the grid. There are several methods by which twoway slabs can be designed. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. Teaching twoway ribbed slab analysis and design using the. Design of reinforced concrete structures ii twoway slabs.
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. Hillerborgs strip method of design 1, 2 is a powerful and versatile technique for designing two way reinforced concrete slabs and plates. Shear force at short span, shear force at long span, where. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process. The basic design procedure of a twoway slab system has five steps. Budapest university of technology and economy faculty of civil egeneering department of structural egineering design of. However, plastic method can be the best method for designing such cases of two way slabs.
It can be used by both practicing engineers and students. These types of slabs are used in constructing floors of multi storeyed building. Sample plans bdc announcements bdc16t02 february 28, 2016 bdc18t03 pdf 888k march 6, 2019 bdc18t02 pdf 590k june 17, 2019 cadd support page these files are updated periodically and therefore some revisions may not apply on a given project. Cad drawing plan view of a reinforced concrete floor slab example. Flat slab analysis, design and detailing pdf civil engineering. Twoway slab analysis and design using equivalent frame method efm aci 318 states that a slab system shall be designed by any procedure satisfying equilibrium and geometric compatibility, provided that strength and serviceability criteria are satisfied. Slab is one of the most famous part of a construction project. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Two way slab being supported on four sides the load will be carried in both the.
Standard details and sample plans, cadd support, engineering. Two way columnsupported slabs two way columnsupported 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. Basic steps in two way slab design choose layout and type of slab. The design details of all the columns are extracted. Time saving design aids twoway slabs page 1 of 14 the following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Slabs are primarily categorized as either one way or two ways. Alternate design method design procedure of two way slabs using aci moment coefficients and approved by bnbc 20 scope and limitations bnbc 6. Chapter 3 design of rectangular beams and oneway slabs 12.
I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. Twoway concrete slab with beams spanning between supports. Example design of two way edgesupported solid slab. Aci 31811 code provides two methods for two way slab design one of which is direct design method. View test prep concrete 3 design of concrete beam and slab twoway slab part 22 from engineerin 101 at royal melbourne institute of technology. Distribute moments transverse at critical sections to column and middlestrip and if. The unit weight of reinforced concrete is assumed to be 24 knm3. Bending will take place in the two directions in a dishlike form. One way and two way slabs one way slabs transfer the imposed loads in one direction only. Allowable stress design or working stress design wsd 2.
Two way slabs have two way bending unlike one way slab. The same is true for a two way slab or any other floor system. Download our free two way slab design spreadsheet only from samotech. Excel sheets, civil engineering excel sheets, spreadsheets, civil engineering spreadsheets, free civil engineering spreadsheets for members, excel sheet. A slab is a concrete structure constructed to provide a flat surface.
No redistribution is allowed when method 1 or method 2 of analysis in section 3. The coefficient method may be the simplest, easiest and the quickest approach for the design of two way slab supported by edge beam on all slab sides. A rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams. Two way concrete slabs with openings experiments, finite element analyses and design piotr rusinowski. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc.
One way and two way slab reinforcement in detail at sit duration. No certain method can be found in the design codes or references for designing two way slabs subjected to concentrated loads. Reinforced concrete slab design using the empirical method. Ce 433, fall 2006 slab design example 1 6 design a one way slab for an exterior bay of a multistory office building using the information specified below. Twoway joist waffle slab design approach and methodology.
75 19 1595 61 913 1359 668 1236 572 81 610 1176 1077 1090 1079 1544 1269 545 1323 813 1206 1074 18 610 1032 951 870 1042 1188 318 1299 540 1328 62 1036 468 1389