Discrepancies exist in the provisions for the design of reinforced concrete pile caps for shear strength between the two uk codes for structural concrete design, bs 8110 and bs 5400. Overview stud rails have been used extensively and have been verified by testing in canada and mainland europe. The program allows analysis to bs en 1992 eurocode 2. This paper examines the design methods for providing resistance against punching shear, generally concerning the strength requirement for transfer of the load from a flat slab to the supporting column or from a column to its base. Member design reinforced concrete beam bs8110 v2015. Mc2010 is based on the critical shear crack theory proposed by muttoni, which relates shear resistance to the width of the socalled critical shear crack which depends. Part 1 1985, eurocode 2 pren 199211 and aci 31802 on pad foundations, with particular emphasis on punching shear was first carried out. Chapter 2 provides detailed descriptions of thedeign prerequisites used for bs 8110 1997. Footings example 1 design of a square spread footing of a. Therefore the software is based on a research paper. Code of practice for design and construction this part of bs 8110 gives recommendations for the structural use of concrete in buildings and structures, excluding bridges and structural concrete made with high alumina cement.
Punching strength with shear reinforcement firstly, one has to check if the design shear force v d is smaller than the maximum punching. If not, check if the amount of reinforcement is reasonable. According to muttoni and schwartz,12 the width of the critical crack can. Chapter 3 provides detailed descriptions of the code specific process used for 8110 1997. Sachpazis date 18012014 chkd by date appd by 1 flat slab design to bs8110. The tension bars must be anchored by bending them up the sides of the pile cap. Its the effect of the bending moments on a particular critical section that adds a considerable amount of punching shear stress which is hard to grasp. Pdf punching shear analysis of reinforced concrete flat plates. It can check a userdefined base design or autodesign an optimum solution to suit user and code criteria. Bending moment coefficient for simply supported twoway slab ref.
Usually in malaysia, the design of structures will be guided by using british standard, bs 8110. Cads rc slab designer provides fast, automatic rc design to bs 8110 for all typical bar arrangements, mesh and slab configurations and can be used standalone or as part of the cads integrated analysis, design and detailing solution. The punching shear strength predicted by the fuzzybased model is compared with those predicted by current punching shear strength models widely used in the design practice, such as aci 31805. The attached picture is a snapshot of the example bs 8110 97 rcpn001. Punching shear analysis of reinforced concrete flat plates. Punching shear punching shear symbols ui ith perimeter. To check the punching shear, the following are the design considerations. Design of foundations universiti teknologi malaysia. Design for punching shear should allow for the effects of moment transfer at the columnslab junction. Punching shear in pad foundations on rock techylib. As discussed in chapter 4, the critical section for punching shear is located at distance d 2 from column faces and usually takes the shape of the column. In addition to as3600, the ancon program enables design of a shearfix system to bs 8110 and bs en 1992, eurocode 2.
These discrepancies have arisen in the historical development of the codes, and the implication is that one. Bs 8110 details how deflections and the accompanying crack widths may be. A total of 79 tested slabs without shear reinforcement were selected from literature to study the treatments by these methods. Footing thickness is adequate for resisting punching shear once vu vc. Bs 8110 design shear construction solutions a division of arcelormittal kent wire limited table 3 form and area of shear reinforcements in beams value of.
Comparison of punching shear requirements in bs 8110, ec2. Your participation and feedback are deeply appreciated, thank you very much indeed. Sharedesign strength for bs 8110 the design strength of material for different cases is tabulated in the bs 8110 part 01 table 2. Punching shear analysis of reinforced concrete flat plates osman m.
Empirical methods of designing against punching shear failure are given in 3. Most design codes base their verifications on a critical section, with the punching shear strength of slabs with orand without shear reinforcement defined as a function of the concrete compressive strength and often of the reinforcement ratio. Punching shear design the design to prevent punching shear failure proceeds as. Pdf punching shear analysis of reinforced concrete flat. Min and max reinforcement as a percentage of the gross csa. Punching shear twoway shear beam shear oneway shear minimum reinforcement in the following, the values in square brackets are defaults of the program. It was found that, only euro code 2 pren 199211 outlines briefly the issue of pad foundations on rock. Shear design capacity deep beam 27% ok ok consulting e n g i n e e r s 4 member design reinforced concrete beam bs8110 v2015. A summary of essential differences between ec2 and bs8110. Aug 30, 2010 rcc2000 spreadsheets for concrete design to bs 8110 and ec2 user guides for each spreadsheet in ms word format and acrobat. Nov 05, 2019 slab design is comparatively easy when compared with the design of other elements. The bsi committee b5252 csb39 as it was then called had expressed concern about the present design method given in bs 8110. Changing the form of structure includes deepening the slab, making the column.
The design shear for beamcolumn joint depends upon the relative strength of beam and column at the joint. Sep 25, 2017 the attached picture is a snapshot of the example bs 8110 97 rcpn001. Critical section for punching shear is at a distance of 1. Punching shear in safe 16 general discussion structural. 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. The first stage of the design is finding the bending moment of the slab panels. Punching shear strength as function of slab rotation the opening of the critical shear crack reduces the strength of the inclined concrete compression strut carrying shear and eventually leads to the punching shear failure. Punching shear with a punch dennis mercados structural. The tension reinforcement should be provided with full anchorage in accordance with section 3. Form of shear reinforcement to be area of shear reinforcement provided to be provided nmm2 less than 0.
Shear design of beams and slabs design of columns detailing of members leading variable action and accompanying variable action. Rcc2000 spreadsheets for concrete design to bs 8110 and ec2. Sachpazis date 18012014 chkd by date appd by 2 characteristic strength of concrete. Pdf the reinforced concrete flat slab is an economical and popular. The procedure for determining the punching shear requirements is shown in figure 4. Reinforced concrete design to bs8110 structural design 1 lesson 5 6 4. Safe checks punching shear twice, once for column punching through the drop panel, then once for droppanel punching through. Manual for the design of reinforced concrete building. Reinforced concrete design to bs8110 structural design 1 lesson 5 1 lesson 5. The results of this exercise have also been used for recommending a revision to the clauses given in the eurocode dd env 199211. Comparison of punching shear requirements in bs 8110, ec2 and.
Aci 31805, cebfip mc 90, and bs 8110 97, represent different. 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. Design of shear reinforcement against punching the. Designing for shear in slabs including punching shear. Hi i am not familiar with bs 8110, but basic physics of the phenomenon is the same. For structures, the lateral stability of which do not rely on the frame action between the slab and columns and in which adjacent spans do not differ in length by more than 25%, the design punching shear may be obtained by enhancing v ed by 1. Chapter documents the design output produced by 4 the programs. Reinforced concrete design to bs8110 structural design 1. Refer attached pdf file as per bs 8110, for calculating punching shear capacity we have to consider % tensile reinforcement.
The bottom of the footing is ft below finished grade. Rcc2000 spreadsheets for concrete design to bs 8110 and ec2 user guides for each spreadsheet in ms word format and acrobat. Comparison of partial factors for loading design situations bs 8110 ec2 with one variable action live load 1. Concentric punching shear strength of reinforced concrete. Shearfix designed to bs en 1992 can also be applied to structures designed to bs 8110. Design reinforcement if reasonable, if not, change form of structure. The ancon design program simplifies the specification and ordering of a shearfix system.
Slab punching shear check in the key features and terminology manual. This easytouse program allows the optimum design to be determined and generates a printable calculation sheet, a dxf file and a parts list of the specified layout. Shearfix punching shear reinforcement ancon australia. Bs 8110 is a british standard for the design and construction of reinforced and prestressed concrete structures. Ultimate moment and shear coefficients in continuous one way slab ref. Punching shear strength of reinforced concrete slabs. Member design reinforced concrete two way spanning slab bs8110 v2015. Sep 03, 2011 design of reinforced concrete slabs 103 calculated punching shear stress at perimeter ui shear force per unit width for bending about xaxis shear force per unit width for bending about yaxis maximum crack width mm depth of neutral axis from compression face distance from edge in ldirection to start of a yield line. Structural engineers and uses the format of the green book manualfor bs 8110. Punching shear % steel structural engineering general.
Member design reinforced concrete two way spanning. The ancon design program allows reductions to be applied to the critical shear perimeter as appropriate. We strongly recommend the shear stud design is verified against an alternate standard such as bs en 199211 eurocode 2 or bs 8110. Design for punching shear concrete structures eurocode. Concentric punching shear strength of reinforced concrete flat plates fariborz moeinaddini submitted in total fulfilment of the requirement of the degree of master of engineering june 2012 centre for sustainable infrastructure, faculty of engineering and industrial science swinburne university of technology, melbourne, australia. Basic principle of pile cap design the structural world.
The shear capacity of the slab is checked against the design shear forces at the critical shear perimeter. Design of concrete structures part i general rules and rules for buildings. 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. Although used for most civil engineering and building structures, bridges. Apr 28, 2020 alternatively, a spreadsheet could be used e. The punching shear strength predicted by the fuzzybased model is compared with those predicted by current punching shear strength models widely used in the design. The punching shear strength of the concrete is not sufficient. This paper compares design provisions for punching shear at internal columns in the superseded british standard bs8110, eurocode 2 ec2 and fib model code. Design of reinforced concrete slabs 103 calculated punching shear stress at perimeter ui shear force per unit width for bending about xaxis shear force per unit width for bending about yaxis maximum crack width mm depth of neutral axis from compression face distance from edge in ldirection to start of a yield line. This part of bs 8110 gives recommendations for the structural use of concrete in. This paper compares design provisions for punching shear at internal columns in the superseded british standard bs 8110, eurocode 2 ec2 and fib model code 2010 mc2010. As per slab dimensions, only bottom slab having depth d2 is effective for resisting punching.
Concrete bs 8110 1997, which is referred to as bs in this manual. Pdf punching shear resistance of normal and high strength. If it were only bs like the equations shown above, the additional punching shear brought about by the unbalanced bending moment in the columns of a flat slab or flat. Depending on the code of a country, the critical section for checking punching shear in slabs is taken at 0. This has not been particularly difficult, as the fundamental approach to the provision of punching shear reinforcement is the same in most design codes.