Two way concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Dhang, department of civil engineering, iit kharagpur. The equations for the analysis have been obtained from the reinforced concrete designers handbook by reynolds and steedman.
The design shear force can be reduced to account for the loads applied inside the outer perimeter. The design booklets of the reinforced concrete buildings series have each been written to form two separate parts. Comparison of oneway and twoway slab behavior oneway slabs carry load in one direction. Maximum ultimate design load is applied throughout all spans or panels. 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. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Introduction in reinforced concrete construction, slabs are used to provide flat, useful surfaces. Determine moments at critical sections in each direction, normally the negative moments at supports and positive moment near midspan. The example presented here is for two way posttensioned design.
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. In two way slabs shorter direction strip carry greater %age of load. Manual for the design of reinforced concrete building. In twoway slabs shorter direction strip carry greater %age of load. Slab design is comparatively easy when compared with the design of other elements. The example presented here is for twoway posttensioned design. The slab has to carry a distributed permanent action of 1.
Member design reinforced concrete two way spanning slab. Design of reinforced flat slabs to bs 8110 ciria 110. The following example illustrates the example building. Reinforced concrete design to bs8110 structural design 1 lesson 5 5 4. One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Bs 8110 concrete design for slab how to pour a concrete slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab design of two way slab example pdf flat slab design pdf design of steeltoconcrete joints design manual concrete design design concrete concrete design mix csa a23. Previous article design of tie beam as per bs 8110. The design process for the now withdrawn bs8110 design standard works slightly differently to that used in the new ec2 bs en 199211. The ratio for a two way spanning slab should be based on the shorter span. Determine suitable dimensions for the effective depth and width of the beam. Design of reinforced concrete structures ii twoway slabs 1 1. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in.
This spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Oneway and twoway slabs university of asia pacific. Jul 28, 20 this spreadsheet performs an analysis and design of two way spanning reinforced concrete slab. Pdf design calculation design of one way slab slab s1. Department of mechanics, materials and structures english. Twoway concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. If you continue browsing the site, you agree to the use of cookies on this website. Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. Sep 02, 2011 3 load beam in the repeated sequence of two adjacent spans loaded with lci and one span loaded with lg. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. Simplified slab analysis bs 8110 allows for a simplified load arrangement for all slabs. Part 1 as 3600 design which provides insight into major new developments in as 3600.
Reinforced concrete design 1 design of slab examples. Lecture series on design of reinforced concrete structures by prof. Two way design slab to bs 8110 free download as pdf file. For flat plates and slabs the column connections can vary between. The first stage of the design is finding the bending moment of the slab panels. The output of the program for the slab in the example is shown in the following pages. Accordingly, main reinforcement is required in the two directions. This spreadsheet performs an analysis and design of twoway spanning reinforced concrete slab. Two way design slab to bs 8110 building engineering. Rc slab design ec2 worked example bending reinforcement duration. D mm d 105 mm loads on slab self weight of slab 3. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc.
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. Reinforced concrete design 1 design of slab examples and. Ultimate behavior of oneway spanning slab linear elastic analysis methods such as moment distribution are linear elastic methods. Pdf design calculation design of one way slab slab s1 span. Design rules have been presented9 for application of british standard bs 8110 to stud design for slabs. As with the green book the scope of the manualcovers the majority of concrete building structures and has now been extended to cover slender columns and prestressed concrete. Analysis and design of twoway slabs page 1 chapter 3. The basic design procedure of a two way slab system has five steps. Twoway restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as twoway restrained slab. The basic design procedure of a twoway slab system has five steps. Mar, 20 title slide of design of reinforced flat slabs to bs 8110 ciria 110 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Design of two way slab example pdf flat slab design pdf bs 8110 concrete design for slab beam and slab bridge how to calculate formwork for slab slab on grade foundation how to pour a concrete slab beam and slab bridge uk post tension slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab operation management 9th edition myomlb nigel slab usercentered design. Title slide of design of reinforced flat slabs to bs 8110 ciria 110 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Member design reinforced concrete two way spanning. A two way spanning slab is a slab with reinforcement in both directions. Member design reinforced concrete two way spanning slab bs8110 v2015. The design bending moment of two way restrained slab can be calculated as follows. Nov 05, 2019 slab design is comparatively easy when compared with the design of other elements. In this example, the calculating value of the effective depth d v is equal to the effective depth d minus the concrete cover c on the bottom surface of the slab. The load on the slab is carried by the short span in one direction. The pca computer program pcaslab can be used to expedite the design of different slab systems. The ratio for a twoway spanning slab should be based on the shorter span. Slab design, bs 8110 slab design, how to determine ultimate load for slabs, how to check for deflection in slabs, how to calculate for dead load, how to calculate for lever arm, basics of slab design, how can i design a 2 way spanning slab. Load transfer in a oneway slab, b twoway slab nilson fig.
This sequence gives the maximum support moment between adjacent spans. A reinforced concrete slab is a broad, flat plate, usually horizontal, with top and bottom surfaces parallel or nearly so. Bending moment coefficient for simply supported two way slab ref. Bending moments coefficiens have been taking from the bs code. Reinforced concrete buildings series design booklet rcb2. Reliability based design of twoway slab in comparison. Aci 31811 code provides two methods for two way slab design one of which is direct design method. Design of two way slab example pdf flat slab design pdf bs 8110 concrete design for slab beam and slab bridge how to calculate formwork for slab slab on grade foundation how to pour a concrete slab beam and slab bridge uk post tension slab concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab operation management 9th edition myomlb nigel slab usercentered design, activity. Two way restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two way restrained slab. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Two way slab design spreadsheet the engineering community.
Design of reinforced concrete structures ii twoway slabs. Ultimate moment and shear coefficients in continuous one way slab ref. Design of reinforced concrete structures ii two way slabs 1 1. Bending moment coefficient for simply supported twoway slab ref.
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. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the bs 8110 part 01 as follows. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Reference design calculations output design of slab panel between grids ab and 12 assume a slab thickness of a 162. Home design calculations design of two way slab as. Economic concrete frame elements to eurocode 2 pictorial index ii symbols iv 1 introduction 1 2 using the charts and data 2 3 insitu concrete construction 24 3. The program covers wide range of two way slab systems and can be used for more complex slab layouts. Structural engineers and uses the format of the green book manualfor bs 8110. Two way slab design by direct design method as per aci 31811. This condition occur when the slabs are connected monolithically with support. Twoway slab design to bs 8110 civil engineering community. To see their result for this slab we will find the load factor. Twoway slabs have two way bending unlike oneway slab.
Two way slabs have two way bending unlike one way slab. The simplified analysis is subject to 3 conditions. However main reinforcement bar and distribution bar in transverse direction. Reinforced concrete design to bs8110 structural design 1. Bs 8110 1997 requirements for twoway solid slab section 3. Twoway concrete slab with beams spanning between supports. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Apr 18, 2019 this spreadsheet performs an analysis and design of twoway spanning reinforced concrete slab.
Comparison of one way and two way slab behavior one way slabs carry load in one direction. Distribute moments transverse at critical sections to column and middlestrip and if. Direct design method, that could have been named the direct analysis method because it determines or prescribes moments for different parts of the slab panel without the need to conduct structural analysis, is explained in the following sections. Slab shear strength twoway shear check the adequacy of slab thickness for punching shear twoway shear at an interior column figure 4. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The design bending moment of twoway restrained slab can be calculated as follows. Analysis and design of slabs two way civil engineers pk.
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