Experimental investigation of the shear behavior of steel fiber reinforced concrete slender beams without stirrups through crack kinematics and shear transfer mechanisms

Abstract

This paper aims to contribute to a more rational understanding of the shear strength behavior of steel fiber‐reinforced concrete beams without stirrups. For this purpose, an experimental program comprising eight slender beams varying the fiber content and type, tested in three‐point bending configuration with a complete monitoring of the displacement fields of the failure span, was carried out. A detailed analysis of the shape and kinematics of the critical crack, associated with the investigation of the shear transfer mechanisms during the test given by mechanical models available in the literature, was performed. The theoretical–experimental analyzes proved to be a promising approach for quantifying the contribution of each relevant parameter to the shear capacity, such as the fiber concrete residual tensile response. The study, therefore, presents a contribution toward a rational and comprehensive methodology for the shear design of concrete members. The influence of shape and kinematics of the critical crack on the shear response is also reported and a theoretical explanation is provided to justify the fact that beams with the same characteristics have different cracking patterns but similar shear strength.

Numerical investigation of shear behavior of steel fiber reinforced concrete beams without stirrups subjected to an asymmetric point load

“…The details of the NLFE models proposed for three groups of SFRC beams with various volume contents and different lengths of steel fibers (i.e., short and long steel fibers) are presented in Section 3. In that section, the finite element analysis (FEA) findings are contrasted with the experimental results reported in the paper of de Resende and Cardoso [27]. The good agreements obtained in all comparison categories confirm the validity of the proposed NLFE models.…”

“…In this paper, a total of six tested beams with dimensions of 150×200×1200 mm in the experimental study conducted by de Resende and Cardoso [27] have been used to calibrate the numerical results from finite element analyses. It is noted that the height-to-span ratio of the beam specimens was designed to be 1/5.3 to consider the a/d ratios lower than 2.5.…”

“…The steel has a yield strength of 555 MPa and an ultimate tensile strength of 702 MPa, with a modulus of elasticity of 200 GPa. [27] According to the shear force diagram, as illustrated in Fig. 2, the shear forces at the supports R 1 and R 2 , denoted V 1 and V 2 , are determined by Eq.…”

“…When these parameters are varied in NLFE modes of SFRC beams without stirrups, the effect of longitudinal steel reinforcement can be considered constant. After this introductory part, the following section briefly describes the experiments conducted by de Resende and Cardoso [27] on a series of six SFRC beams without stirrups subjected to asymmetrical loading. Their experimental results have been used to verify the NLFE models presented in this work.…”

Analysis of the influence on structural seismic performance by the composite reinforcement method

“…There were many common strengthening methods, including increasing section, replacing concrete, outsourcing section steel, sticking FRP, adding support, and adding shear wall. [3][4][5][6][7][8] Isaac et al 9,10 verified that the structural properties of steel section concrete were superior to those of traditional RC structures. Adam et al 11 strengthened RC columns with external section steel and verified the feasibility of strengthening through axial compression test study and finite element software modeling analysis of specimens.…”