Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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. 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. D mm d 105 mm loads on slab self weight of slab 3. Download book pdf structural design guide to the aci building code pp 3754 cite as. In twoway slabs shorter direction strip carry greater %age of load. 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. The ratio lb which is less than 2 is known as two way slab. If you continue browsing the site, you agree to the use of cookies on this website. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p.
Design of a two way rcc slab structural engineering. For example the name lsacposx can be interpreted as left slab. Oneway and twoway slabs university of asia pacific. Oneway slab design spreadsheet calculator engineers. For example, the code requires stirrups in most beams, but specifically exempts slabs and footings from the requirement. Two way slab design to aci free download and software.
A 175 mm thick continuous slab is required to support screed, finishes, an office variable action of 2. I have developed a microssoft excel software for design of a two way rcc slab. Slabs are usually used in floor and roof construction. Minimum thickness of beams and oneway slabs values given in this table shall be used directly on members with normalweight concrete and grade 60 reinforcement. This spreadsheet is an extremely efficient tool and allows to quickly design two way slabs to aci code. Civilax is the knowledge base covering all disciplines in civil engineering. Element simply supported one end continuous both end continuous cantilever one way slabs l20 l24 l28 l10 where l is the span length in the direction of bending. Load transfer in a oneway slab, b twoway slab nilson fig. They may be supported on two opposite sides only fig. Plan view of floor system assume partitions will not be damaged by deflections. Oneway slab is the most basic and common type of slab.
Slab with reinforcement with yield stress, f y, exceeds 60,000 psi measured at a yield strain of 0. 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. 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 slab design excel sheet civil engineers pk. This will appear at the top of the first page of the output. Accordingly, main reinforcement is required in the two directions. Download code oneway slab design procedures and design. A single slab with oneway reinforcement rebars will be analyzed with rcsolver. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Design of reinforced concrete structures ii twoway slabs. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Sandwich slabs may have the disadvantage of a larger weight compared to the ribbed ones but on the other hand, they have the advantage that their spans and supports behave in the same proper way. The simplest routine structural element for illustration of design provisions in the code is the oneway slab. You should look at the bar diameter and spacing in the table displayed next to the graphical viewer or at fi16 400 mm on the description of the reinforcement bar in this zone instead as this is the actual area of the provided reinforcement.
The ratio of the total costs was found to be within the range 1. For other conditions, the following modifications should be applied. Continuous oneway solid slab concrete structures eurocode. 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. Two way slabs are normally supported from four sides. 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. Assume partitions cannot be damaged by deflections. A oneway slab is defined for purposes of this book as a flexural member with depth. Rectangular beams and one way slabs page 3 of 9 design of rectangular beams and one way slabs continued a. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects. Design example of one way slab with detailing scribd. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Sandwich slab reinforcement details in reality, sandwich slabs are ribbed slabs with a slab placed both to their upper and lower surface.
Difference between one way slab and two way slab simple. This example goes through the design of a simplysupported oneway slab on beams. The direction in which the load is carried in one way slab is called the span. Bending will take place in the two directions in a dishlike form. One way slabs are those supported continuously on the two opposite sides so that the load sare carried along one direction only. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Two way slab design by direct design method as per aci 31811. A oneway slab is defined for purposes of this book as a flexural member with depth small relative to other dimensions, supporting gravity loads applied normal to and directly over its surface, spanning in one direction between parallel supports, and reinforced for flexure. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Pdf design of reinforced concrete slabs ninos dinkha.
For the purpose of this tutorial, enter the general title as sixspan, oneway slab. Oneway and two way slabs one way slabs transfer the imposed loads in one direction only. Oneway solid slabs are designed as a number of independent 1 ft or 12 wide strips which span in the short direction and supported on crossing beams. Summary of bill of quantities civil works bar bending schedule. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Oneway and twoway slabs oneway slabs transfer the imposed. Pdf oneway slabs subjected to combination of loads failing in. A fundamental task in the design of reinforced concrete structures is to search for. Design of reinforced concrete structures ii twoway slabs 1 1.
Rc slab design ec2 worked example bending reinforcement duration. Analysis and design of slabs two way civil engineers pk. Generally, there are two types of slab which are one way and two way slabs. Engineering excel spreadsheet downloads civil engineering resources. One way slab design excel sheet, all civil engineering spreadsheets available on. A one way single span reinforced concrete slab has a clear. Beams of width and depth are provided on all column lines. This calculation is intended to show in detail the provisions of designing a slab to eurocode 2 using essentially the same slab as used in example 3. Twoway slabs have two way bending unlike oneway slab. Chapter 3 design of rectangular beams and oneway slabs. Direct design method ddm for slab systems with or without beams loaded. The analysis and design of oneway slab, oneway joist, interior beam, and exterior beam are shown in this example. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23.
This will appear at the top of the each subsequent page of the output. Slab shear strength twoway shear check the adequacy of slab thickness for punching shear twoway shear at an interior column figure 4. Define the term slab, one way slab, two way slab, shrinkage and temperature reinforcement, main reinforcement. One way slab design criteria with design example according to aci code slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Comparison of oneway and twoway slab behavior economic choices oneway slab on beams suitable span 3 to 6m with ll 35knm2. Pdf design calculation design of one way slab slab s1. Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. One way and two way slab design aspect online civilforum. Use a spreadsheet to design each section and show your results with a sketch elevation view. The slab is supported on beams of size 225 x 500 mm spaced at 4. Reinforced concrete design 1 design of slab examples and.
One way and two way slab design aspect the slab provides a horizontal surface and is usually supported by columns,beams or walls. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Can be used for larger spans with relatively higher cost and higher deflections oneway joist system suitable span 6 to 9m with ll 46knm2. Design example of one way slab with detailing free download as pdf file. Reference 5 focused on analysis of twoway ribbed slabs with. Oneway slab design spreadsheet civil engineering community. Analysis of two way ribbed and waffle slabs with hidden beams. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. 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.
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