One way slab design simplified online design of concrete. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Beams and one way slabs how to design concrete structures using eurocode 2 design procedure a procedure for carrying out the det ailed desi gn of slabs assumes that the slab thickness has previously been determined during conceptual design. One way slab design excel sheet, all civil engineering spreadsheets available on. Pdf design calculation design of one way slab slab s1. However main reinforcement bar and distribution bar. 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.
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. In this article, i will discuss how to design one way slab with example. Flat slab analysis, design and detailing pdf civil. Design of two way ribbed slab 18 x 25 m clear span 1. The numbering of the members is explained as below. That is, the load factor at which the uls moment equals the moment capacity. A train entertainment, real music co earthsea management, bmi broadcast music inc. For those who do not know what are the des ign requirements of a slab. One way and two way slabs one way slabs transfer the imposed loads in one direction only.
Design of concrete structures 14th edition, 2009, by arthur h. Minimum thickness of nonprestressed oneway slab normal weight. Flat slab haunched slab a longitudinal slab is one of the least complex types of bridge superstructures. More detailed advice on determining design li fe,actions, material properties, methods of analysi s. Symbol description units a area of column crosssection m2 a, b, c plan dimensions of slab supported on several sides m d dissipation of internal energy knm e expenditure of energy by external loads knm. 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. We aim to close the gap to the industry by improving the awareness about latest trends in civil engineering. Pt designer design of posttensioned concrete floors. Ce 433, summer 20 slab design example 1 5 design a one. Generally, there are two types of slab which are one way and two way slabs.
The ratio for a two way spanning slab should be based on the shorter span. The following example illustrates the example building. Here are the steps for the design procedure for one way slab in steps. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in. These are the direct design method presented in chap. One way slabs are suitable only for relatively short spans. Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Design of reinforced concrete structures ii two way slabs 1 1. Engineering excel spreadsheet downloads civil engineering resources. The proposed slab system must be able to be constructed at a reasonable cost.
However, the design example in chapter 10 includes. Analysis of two way ribbed and waffle slabs with hidden beams ibrahim mohammad arman international journal of civil and structural engineering volume 4 issue 3 2014 343 four slabs are taken in this study to show the moments distribution in two way ribbed slab with hidden beams systems. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and public. They may be supported on two opposite sides only fig. Design of slab two way excel sheet design spreadsheets the specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. Bridge approach slab analysis and design incorporating elastic soil support presented by. The overhang of the slab beyond the face of the column is not included in the calculations. There are many methods that are used to analyze two way slabs and the precision of these methods vary depending. How to design concrete structures using eurocode 2. Practical yield line design 2 notation symbols the symbols used in this publication have the following meaning. Estimates in building construction sample spreadsheet. Assume partitions cannot be damaged by deflections.
The following example illustrates the design methods presented in the pca book simplified design. Plan view of floor system assume partitions will not be damaged by deflections. The proposed slab system must meet the current code. Design of reinforced concrete structures ii twoway slabs. Flexible pavement design, calculator, sn, aashto design, structural number. Part two is an example intensive course, with key concepts introduced along. Safety file for reference throughout the lifetime of the building. Analysis and design of slabs one way civil engineers pk. Beams of width and depth are provided on all column lines. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. The build quality is second to none, way better than what canonnikon can offer in a compact size. Design of an one way reinforced concrete slab with rcsolver software program. Oneway slab design spreadsheet calculator engineers edge. Design of two way floor slab system comparison of one way and two way slab behavior one way slabs.
Design a oneway slab for an exterior bay of a multistory office building using the information specified below. I bought this camera the minute it became available. The load on the slab is carried by the short span in one direction. Rectangular beams and one way slabs page 3 of 9 design of rectangular beams and one way slabs continued a. Bending will take place in the two directions in a dishlike form. At ground level, the floor beams fb are not provided, since the floor directly rests on ground earth filling and 1. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. Example design combinations for deflection quasipermanent derived for typical uk reinforced concrete design. Temperature nonfire in buildings see bs en 199115 0. The codes governing the design of the one way slab will be aci 31802 and ibc 2003. Civil engineering ebooks and many more civil engineering. Oneway slab design spreadsheet civil engineering downloads.
Example design of two way edgesupported solid slab. Further information was provided by dr w i simms and mr a way, both from. Chapter 18 concrete slab structures january 2019 183 18. Typical slab reinforcement structure design detail. Two way concrete slabs with openings the static system and the design of reinforcement. Design the slab following the provisions of the aci code.
Download code one way slab design procedures and design. The slab is without drops and is supported internally and on the external long sides by square columns. Twoway concrete floor slab with beams design and detailing. Designing of slabs depends upon whether it is a oneway or a two way slab, the end conditions and the loading. 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. 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. Aug 09, 2014 civilax is the knowledge base covering all disciplines in civil engineering. The output of the program for the slab in the example is shown in the following pages. It has, however, been demonstrated that equally good structures can be achieved in unbonded posttensioning by suitable design and detailing.
A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. The main objective of this project is to analyze and design a multistory building 3ddimensional reinforce concrete frame, the design of reinforced concrete slabs, beams, columns, footings and. If slab is supported on all four sides and r shorter side longer side one way slab. The lateral loads are independently resisted by shear walls. Using concrete class c3037 and high yield steel, prepare a complete design and detailing for this slab.
Typical slab reinforcement structure design detail autocad dwg plan n design. The building is located in seismic zone iii on a site with medium soil. Reinforced concrete slab design using the empirical method. Structurepoint sp the analysis and design of one way slab, one way joist, interior beam, and exterior beam are shown in this example. Mathematical structural analysis of one way ribbed slabs was introduced in this paper. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Slabs having supports on less than four sides can be designed as one way.
Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Rectangular beams and one way slabs page 2 of 9 two methods. The slab has to carry a distributed permanent action of 1. Sep 27, 2012 design of an one way reinforced concrete slab with rcsolver software program according to eurocode 2 specifications. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. The results of this analysis are compared with the results of the finite element method by sap program. Fundamentals of posttensioned concrete design for buildings part one a suncam online continuing.
The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by structural steel beams, by columns, or by the ground. Twoway joist waffle slab design approach and methodology. Dhang, department of civil engineering, iit kharagpur. Fundamentals of posttensioned concrete design for buildings part one. Matlab file, matlab function, truss analysis, plane truss, visualization, view all files of finite elements method. Chapter 3 design of rectangular beams and oneway slabs 12. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Slab support condition solid slabs continuous at one end solid slabs continuous at both ends simple span solid slabs cantilever. The one way shear capacity for the ribbed slab portions shown is permitted to be increased by 10%. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft.
Asc steel deck is leading the way in innovation with ongoing testing of. The basic design procedure of a two way slab system has five steps. 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. The two classifications are one way slab and two way slab. Design procedure steps for one way slab slab design steps. Lecture series on design of reinforced concrete structures by prof. Two way 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. Two way slabs have two way bending unlike one way slab. Design of reinforced concrete structure one way slab presented by md. Bending will take place in the two directions in a dishlike fo. In two way slabs shorter direction strip carry greater %age of load. Reinforced concrete design 1 design of slab examples and. Oneway slabs transfer the imposed loads in one direction only.
In a oneway spanning slab the area of each bay exceeds 30 m2. One way slab design procedure with example design of one. Oneway and twoway slabs university of asia pacific. Aug 14, 20 licensed to youtube by kobalt awal digital limited on behalf of real music. End column one side of the column parallel to the axis of the moment is less than four times the slab thickness from a slab edge in cases 2, 3 and 4, column is assumed to be at the edge of the slab.
The pca computer program pcaslab can be used to expedite the design of different slab systems. The bottom of the footing is ft below finished grade. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Introcduction slab in which the deflected surface is predominantly cylindrical termed as one way slabs spanning in the direction of curvature. Twoway concrete slab on beams floor analysis and design. Allowable stress design or working stress design wsd 2. Fundamentals of posttensioned concrete design for buildings. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Analysis and design of slabs two way civil engineers pk.
Collection of civil engineering design spreadsheet. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Posttensioned oneway slab pennsylvania state university. One way slab here i solve a probleam based on the one way slab, the diamentions are provided in the probleam 1st determine the aspect ration and with respect to the aspect ratio the type of slab. Footings example 1design of a square spread footing of a sevenstory building design and detail a typical square spread footing of a six bay by five bay sevenstory building, founded on stiff soil, supporting a 24 in. Posttensioned concrete design spreadsheet program a pdh. I like the way how it looks and the design reminds me of my favorite nikon film cameras, the nikon fm2fm3a. 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. Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. Oneway and twoway slabs oneway slabs transfer the imposed. This spreadsheet program provides for the design and analysis of posttensioned concrete one way beam and slab systems and two way flat plate slab systems. 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. This paper focuses on analysis of two way ribbed and waffle slabs with hidden beams.
Chapter 3 design of rectangular beams and oneway slabs. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Twoway slabs structural engineering forum of india, sefi.
Two way slab design by direct design method as per aci 31811. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. 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. Precast spandrel beam for combined shear and torsion. This type of slab is supported by two parallel beams, the beam framing into girders in turn framing into columns. The program is developed around the robust computational core of two popular programs ptdata. Ultimate behavior of one way spanning slab linear elastic analysis methods such as moment distribution are linear elastic methods. The following example illustrates the design methods presented in aci 31805 and ibc 2003. This guide covers the design and construction of composite slabs and beams, and addresses. The general layout of the building is shown in figure 1.
Concrete slabs are commonly divided into the following types. Design calculation, analysis files, autocad drawings and many more. The hand solution is used for a detailed comparison with the analysis and design results of the engineering software program. Architectengineer to be a part of the contract documents, they shall be. Oneway slab design procedures and design example civil. Sci p300, composite slabs and beams using steel decking. It is not the intention of the present report to express a preference for one type of posttensioning or the other. Slab slabs are an important structural component where prestressing is applied. Twoway joist concrete slab floor waffle slab system. Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. Design of slabtwo way excel sheet online civilforum.
Drawing shows typical slab structure detail through plan, sections and required legendguidelines. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Design of one way reinforced concrete slabs class notes and example notes on. Analysis of two way ribbed and waffle slabs with hidden beams. 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. Footings example 1 design of a square spread footing of a. Slab is a common term used to describe the structural elements such as floors and roofs where the thickness of the element is very small compared to the length and. To see their result for this slab we will find the load factor.
Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. In case of one ways slabs, the aci approximate analysis is applicable to one way slab system where a one way slab is continuous with a one way slab. Typical slab reinforcement detail with the detail of distribution bar, spacing between bars etc. 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. Reinforced concrete design 1 design of slab examples. Two way slab design based on aci 31811 using finite element method.
Determine the loads based on the buildings parameters section d. One way wide module skip joist concrete floor system design aci 31814 author. 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 in accordance with as3600 ccaa. 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. In sap program, the model has been divided to frame elements to represent ribs and beams and shell elements to represent the slab and solid part. The following simplified design is valid when length2width of slab and for 15ft or 4. D mm d 105 mm loads on slab self weight of slab 3. One way slab design excel sheet civil engineers pk. Teaching twoway ribbed slab analysis and design using the. 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.