Fib Bulletin fifty seven is a suite of contributions from a workshop on "Recent advancements on shear and punching shear in RC and FRC elements", held in Salò, Italy, in October 2010. Shear is one among a couple of components of analysis into basics of the behaviour of concrete buildings the place competition continues to be among researchers. there's a carrying on with debate among researchers from a buildings standpoint and people from a fabrics or fracture mechanics standpoint in regards to the mechanisms that let the strength stream via a concrete member and throughout cracks.
In 2009, a operating workforce used to be shaped inside of fib job workforce 4.2 "Ultimate restrict kingdom types" to harmonise assorted rules approximately layout techniques for shear and punching. a big final result of this paintings was once the consequent discussions among specialists and practitioners concerning the shear and punching provisions of the draft fib version Code, which ended in the association of the Salò workshop. Invited specialists within the box of shear and FRC gave 18 lectures on the workshop that was once attended via seventy two members from 12 nations in three diverse continents.
The contributions from this convention as compiled during this bulletin are believed to symbolize the simplest of the present country of data. They definitely are of basic curiosity to fib individuals and particularly invaluable within the finalization of the 2010 fib version Code. it really is was hoping that this booklet will stimulate extra study within the box, to refine and harmonize the on hand analytical versions and instruments for shear and punching layout.
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Additional resources for Fib 57: Shear and punching shear in RC and FRC elements (workshop proceedings)
Sample text
The results of the CSCT have been checked against tests found in the literature as well as 146 punching shear tests specifically performed at École Polytechnique Fédérale de Lausanne over the past 10 years. 25 m). Thanks to these test campaigns, the main hypotheses of the theory have been validated and some behaviours predicted by the theory (as the slenderness effect or the activation of the shear reinforcement in flat slabs) have been confirmed. In this paper, the mechanical model of the CSCT is thoroughly explained and justified as well as the main hypotheses typically adopted for design of new structures.
As expected, the predictions are best for members with sufficient stirrup quantity that they are failing by crushing the concrete. Note that the Oregon beam results from Fig. 7 fall right in the data cloud for lower strains. 25 will be defined as a “practical” test for a level II analysis though those particular limits are somewhat arbitrary. 00 0 20 Calcualted Mid-depth strain x 40 60 80 100 120 140 Concrete Strength (MPa) Fig. 10: Quality of Level III predictions for members with stirrups fib Bulletin 57: Shear and punching shear in RC and FRC elements 27 .
12) where s,el is the stress during the activation phase, s,b is the maximum stress that can be developed by bond, s,p is the maximum stress that can be developed by pull-out of the lower anchorages and fyw is the yield strength of the steel. Assuming a rigid-plastic law for bond, s,el can be calculated prior to yielding as [Fernández Ruiz et al. 13) where b refers to the bond strength of the mortar, db is the bar diameter, Es is its modulus of elasticity and wb is the opening of the critical shear crack at the level of the shear reinforcement (which can be calculated using the CSCT hypotheses, [Fernández Ruiz et al.