Comparative analysis among standards of the area calculation of transversal reinforcement on reinforced concrete beams of high resistance subjected by shear force

Abstract

High strength concretes (HSC) correspond to a characteristic compression strength between 55 e 90 MPa. With the growing use of HSC, studies about the regular design standards of elements made of it, specifically standards about design on shear, become necessary. Hence, the main aspects of the NBR, Model Code 1990 e 2010, Portuguese Standard and German Standard related to the design on shear are presented. From the numerical simulations, with the addition of Cladera and Marí’s experimental contributions, it is confirmed that the Brazilian design standard procedure produces lower transverse reinforcement areas in comparison to the ones predicted by the international codes; these, excepted by LoA III, do not consider the concrete contribution, in spite of being experimentally verified, leading to very conservative results.

Use of Extreme Properties of Deformation for Estimation of Strength of Constructive Concrete and Reinforced Concrete

“…The tasks of estimating the strength of elements in inclined sections are solved on the basis of the method of truss analogy with the introduction of empirical coefficients [8][9][10]. At the same time, the shear form of failure is experimentally confirmed, both within the boundaries of the compressed strut (strip) and under the dangerous inclined crack [9][10][11][12].…”