A typical sixspan, one way slab supported on beams,as occurs in parking structures is selected. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Oneway and twoway slabs oneway slabs transfer the imposed. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Design of two way slabs by coefficient method slab is one of the basic parts of a building. A six storey building for a commercial complex has plan. Learn to design reinforced concrete one way slabs through. Two way slabs are normally supported from four sides.
A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. In this case the structural action of the slab is essentially one way. Design of reinforced concrete structures ii two way slabs 1 1. The design shear force v d is below the maximum punching strength v rd,max. One way slab design excel sheet civil engineers pk. Design example of one way slab with detailing free download as pdf file. In high rise buildings and skyscrapers, thinner, precast concrete slabs are slung between the steel frames to form. 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. The basic design procedure of a two way slab system has five steps. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.
One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Application of lb ratio in first figure slab is supported on two opposite sides only. Therefore, the slab can be reinforced with shear reinforcement complying with detailing rules defined in subclause 7. One way slab design procedure with example design of one. Reinforced concrete design 1 design of slab examples and. 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.
Reference 5 focused on analysis of twoway ribbed slabs with. Slabs are usually used in floor and roof construction. I have an excel sheet for designing of two way slab but that sheet is password protected. Following are the rcc slab design and detailing guidelines. Load transfer in a one way slab, b two way slab nilson fig. Aug 15, 2016 download code one way slab design spreadsheet. The following example illustrates the example building. The basic design procedure of a twoway slab system has five steps. Her desire is to raise the structure one full story 8 feet and use the lower level for parking and. Slabs having supports on less than four sides can be designed as one way. The program covers wide range of twoway slab systems and can be used for more complex slab layouts. Ce 433, summer 20 slab design example 1 5 design a one.
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. Pdf slabs are the flooring systems of most structures including office. Generally, there are two types of slab which are one way and two way slabs. Pdf behavior of one way reinforced concrete slabs with styropor. A civil engineer must know all the aspects regarding the flat floor system. Chapter 3 design of rectangular beams and oneway slabs. Although the major reinforcement in one way slab span is in. Plan view of floor system assume partitions will not be damaged by deflections. The ratio lb which is less than 2 is known as two way slab. Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. Load transfer in a oneway slab, b twoway slab nilson fig.
Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. This entry was posted in excel sheets and tagged excel sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by. The owner of a singlestory crawlspace home intends to elevate the structure to eliminate a repetitive flooding. Design example of one way slab with detailing scribd. One way slab oneway slabs are those slabs with an aspect ratio in plan of 2. Apr 27, 2017 2 even when a rectangular slab is supported on all the four edges, the slab may be considered as a one way slab if the lengthtobreadth lb ratio of the slab is equal to or greater than two. Example design of two way edgesupported solid slab. For uniformly distributed loads of w per square foot of the. If slab is supported on all four sides and r shorter side longer side sample. The ratio of the total costs was found to be within the range 1. Flat slab analysis, design and detailing pdf civil engineering. Difference between one way slab and two way slab simple.
Analysis and design of slabs one way civil engineers pk. Designing of slabs depends upon whether it is a oneway or a two way. The output of the program for the slab in the example is shown in the following pages. Download code oneway slab design procedures and design. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Nov 27, 20 one way slab oneway slabs are those slabs with an aspect ratio in plan of 2. Twoway slab design based on aci 31811 using finite element method. 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.
Accordingly, main reinforcement is required in the two directions. The slab has to carry a distributed permanent action of 1. The lateral loads are independently resisted by shear walls. 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.
Assume partitions cannot be damaged by deflections. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250. Maximum spacing for shrinkage steel in one way slab. Direct design method ddm for slab systems with or without beams. Bending will take place in the two directions in a dishlike form.
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. Although the major reinforcement in one way slab span is in the short direction, yet at the corner, the moment is actual supported by beams at both directions. Flat slab analysis, design and detailing pdf civil. One way slab design criteria with design example according to aci code. Design of reinforced concrete structures ii twoway slabs 1 1. 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. We believe that the quickest way to learn is by actual application of the information. Calculate the design moment strength of a oneway slab 2. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design.
Slab being the first element to be designed has pretty much importance as the whole structural design. Dec 20, 2017 in this video deisgn of two way slabs has been covered using is 456. I had downloaded that sheet from internet so even i dont know the password of it. If slab is supported on all four sides and r shorter side longer side one way slab. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement.
The program covers wide range of two way slab systems and can be used for more complex slab layouts. In one way slab, the ratio of longer span l to shorter span b is equal or greater than 2, i. Slab being the first element to be designed has pretty much importance as the whole structural design is based on the design of slab. One way slab is supported by two parallel beams or walls.
Design of reinforced concrete structures ii twoway slabs. One way slab supported on beams the objective of this tutorial is to demonstrate the stepbystep procedure of adapt pt to analyze and design a posttensioned continuous slab supported on parallel beams or walls. Posttensioned concrete design spreadsheet program a pdh. Oneway slab design spreadsheet civil engineering community. In one way slab, the ratio of longer span l to shorter span b is equal or. Jul 26, 2014 this entry was posted in excel sheets and tagged excel sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by civilengineerspk. The direction in which the load is carried in one way slab is. One way slabs are those supported continuously on the two opposite sides so that the load sare carried along one direction only. Reference 5 focused on analysis of two way ribbed slabs with. 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. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Beams of width and depth are provided on all column lines. One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The reinforcement bars are placed in the slab ribs between the blocks.
The design shear force v d is below the maximum punching. In this video deisgn of two way slabs has been covered using is 456. Types of one way slab one way slab may be solid hollow ribbed 6. Bar bending schedule excel spreadsheet for rcc slab concrete mix design excel calculator. Oneway slab supported on beams the objective of this tutorial is to demonstrate the stepbystep procedure of adapt pt to analyze and design a posttensioned. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Please read the lauses mentioned in the video while solving the problem. Civilax is the knowledge base covering all disciplines in civil engineering. The owner of a singlestory crawlspace home intends to elevate the structure to eliminate a repetitive flooding hazard.
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 one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. Designing of slabs depends upon whether it is a oneway or a two way slab, the end conditions and. Verandah slab is a type of one way slab, where the slab is spanning in the shorter direction. Effective span of slab shall be lesser of the two 1. Flat slab system is an important division of concrete floor system. Difference between one way slab and two way slab daily civil. 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. 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.
Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. Reinforced concrete slab design and detailing guide is456. Slab with reinforcement with yield stress, f y, exceeds 60,000 psi measured at a yield strain of 0. Distribute moments transverse at critical sections to column and middlestrip and if.
Two way slab design by direct design method as per aci 31811. Oneway and twoway slabs university of asia pacific. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near mid. Oct 27, 2016 one way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. Analysis of two way ribbed and waffle slabs with hidden beams. The pca computer program pcaslab can be used to expedite the design of different slab systems. Reinforced concrete design 1 design of slab examples. Maximum spacing for main steel in one way slab according to aci 7. 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. Firstly, one has to check if the design shear force v d is smaller than the maximum punching strength v rd,max. Design of oneway slab free download as powerpoint presentation. Twoway joist concrete slab floor waffle slab system. Chapter 3 design of rectangular beams and oneway slabs 12.
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