Detailing and design of earthquake resistant buildings made of reinforced concrete. Uniformly distributed load was considered, that represent almost practical cases. Twoway slabs have two way bending unlike oneway slab. Pdf design of reinforced concrete circular slabs by twoway. Technical assignment 2 pennsylvania state university. 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. Click to share on twitter opens in new window click to share on facebook opens in new window related posts. Twoway concrete slab with beams spanning between supports. Jul 22, 2015 my graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete.
The specified design strength of the concrete, is 25 mpa and the specified yield strength of the reinforcement, fy, is 400 mpa. Chapter 3 design of rectangular beams and oneway slabs 12. The program covers wide range of twoway slab systems and can be used for more complex slab layouts. 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. Twoway slab example 1 beam structure classical mechanics. Useful illustration example is presented in this study according.
Twoway slabs structural engineering forum of india, sefi. Twoway slab analysis and design aci 318 states that a slab system shall be designed by any procedure satisfying equilibrium and geometric compatibility, provided that strength and serviceability. Test results akd analysis of data for fullscale twoway slabs 101 general remarks 101 behavioral. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. 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. I am submitting it to you and i want students or professional engineers to download it and use it for their studies or projects.
Chapter 3 design of rectangular beams and oneway slabs. Plan view of floor system assume partitions will not be damaged by deflections. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. A civil engineer must know all the aspects regarding the flat floor system. Civilax is the knowledge base covering all disciplines in civil engineering. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Generally, there are two types of slab which are one way and two way slabs. The unit weight of reinforced concrete is assumed to be 24 knm3. My graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete. But, with proper application and enough safety factor yield line method.
Oneway slab design spreadsheet civil engineering community. The other ways of analysis of twoway slabs are the direct design method and the equivalent frame method. Design of oneway slabs the structural action of a oneway slab may be visualized in terms of the deformed shape of the loaded surface. Bb example 2 design the two way ribbed slab the covering materials weigh 2. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Design of concrete structures 14th edition, 2009, by arthur h. Interior bay dimensions 20 24 this example is to be used for educational purposes only. Effective depth d span ldbasic x modification factor for obtaining modification factor, the percentage of steel for slab can be assumed from 0. Twoway concrete floor slab with beams design and detailing. Two way rcc slab designing excel sheet civil engineering. 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 2688 venado way rescue, ca 95672 phone.
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. Flat slab analysis, design and detailing pdf civil engineering. This is a part of his project economic design of two way rcc slabs under prof s. Aci318 code provides two design procedures for slab systems. Design of reinforced concrete structures ii twoway slabs.
A simplified method for designing rc slabs under concentrated. Flat slab system is an important division of concrete floor system. Test procedure for twoway slabs 90 general remarks 90 slab 1 92 slab 2 93 slab 3 94 slab 4 96 slab 5 97 slab element specimens 98 chapter 5. Twoway concrete floor slab with beams design and detailing csa a23. Slab moments calculated by various slab analysis methods are compared with each other for idealized flatplate and two way slab onbeam structures. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Technical assignment 2 2012 jon fisher technical assignment 1 september 21, 2012 page 3 k e e n t 1 2 359 n 1 2 182 e 1 2 283 s 2 3 265 t 3 3 107 t detailed project schedule the schedule at reston station and an ontime delivery date is vital because the parking. The pca computer program pcaslab can be used to expedite the design of different slab systems.
Twoway concrete slab on beams floor analysis and design. Aug 15, 2016 download code one way slab design spreadsheet. Gallares street, tagbilaran city bohol, philippines 3600 tel. Okay, i know it is based on upper bound thorem and the solution might be unsafe. The one way slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Example design of two way edgesupported solid slab. The following example illustrates the example building. Twoway joist concrete slab floor waffle slab system. However, plastic method can be the best method for designing such cases of twoway slabs. Design examples 52 this chapter illustrates application of the 2009 edition of the nehrp recommended provisions to the design of foundation elements.
Oneway and twoway slabs oneway slabs transfer the imposed. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Jul 10, 2017 one way concrete slab design part 1 concept explained and minimum slab thickness canadian code duration. Two way reinforced concrete slab design spreadsheet working stress design coefficient method download spreadsheet. Design of a two way rcc slab structural engineering. I have developed a microssoft excel software for design of a two way rcc slab. The ratio of the total costs was found to be within the range 1. Reinforcement implementation, static and dynamic analysis for reasons regarding behaviour, safety and economical design, the twoway slab is far more efficient than the equivalent oneway slab. 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. Figure 1 illustration of sub slab probe design components of the subslab probe. Allowable stress design or working stress design wsd 2. The dimensions of an interior bay are shown in figure 1. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. In two way slabs shorter direction strip carry greater %age of load.
These materials are originally located at different websites. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. The explicit transverse torsional member method is found to give good results for drifts and slabbeam actions, and is recommended for analysis and design of twoway slab systems under combined. 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. The design shear force of twoway restrained slab can be calculated as follows. Two way slab design design of two way slab rc design. Twoway slab analysis and design using elastic frame method efm. Two way slab design by direct design method as per aci 31811. Slab moments calculated by various slab analysis methods are compared with each other for idealized flatplate and twoway slabonbeam structures. Two way slabs have two way bending unlike one way slab. For designing two way slab refer is code 4562000 and sp16. The output of the program for the slab in the example is shown in the following pages.
The basic design procedure of a twoway slab system has five steps. Two way reinforced concrete slab design spreadsheet. No certain method can be found in the design codes or references for designing twoway slabs subjected to concentrated loads. Beams of width and depth are provided on all column lines. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Twoway flat plate concrete floor system analysis and design. Pdf slabs are the flooring systems of most structures including office. Rectangular beams and oneway slabs page 2 of 9 two methods. 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.
Reference 5 focused on analysis of twoway ribbed slabs with. Design of reinforced concrete structures ii two way slabs 1 1. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two. In twoway slabs shorter direction strip carry greater %age of load. The explicit transverse torsional member method is found to give good results for drifts and slab beam actions, and is recommended for analysis and design of two way slab systems under combined. Accordingly, main reinforcement is required in the two directions. Manual for the design of reinforced concrete building. Design of reinforced concrete structures ii twoway slabs 1 1. Reference 5 focused on analysis of two way ribbed slabs with. Analysis of two way ribbed and waffle slabs with hidden beams. Reinforcement implementation, static and dynamic analysis for reasons regarding behaviour, safety and economical design, the two way slab is far more efficient than the equivalent one way slab. Best is subjective, so i will give my opinion here.
Design of slabtwo way excel sheet online civilforum. Assume partitions cannot be damaged by deflections. The lateral loads are independently resisted by shear walls. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. One way slab one way slab is supported by beams in only 2 sides. Rectangular beams and one way slabs page 2 of 9 two methods. Load transfer in a oneway slab, b twoway slab nilson fig. Shear force at short span, shear force at long span, where.
The behavior and analysis of twoway simply supported. Load transfer in a one way slab, b two way slab nilson fig. 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. Analysis and design of slabs two way civil engineers pk. Bending will take place in the two directions in a dishlike form. Use the aci 318 direct design method to design an interior bay of a flat plate slab system of multi bay building. Oneway and twoway slabs university of asia pacific. The following example illustrates the design methods presented in the pca book. Design of a two way rcc slab structural engineering forum. Reinforced concrete slab design using the empirical method. Two way reinforced concrete slab design spreadsheet working. Abstractdesigning twoway slabs under transverse concentrated loads is one of the challenges in designing such structures. 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.