Abstract：In order to investigate the effect of initial static loadings on the dynamic shear performance of basalt fiber reinforced polymer(BFRP)-reinforced concrete (BFRP-RC) beams with different shear span ratios, take advantage of a 3D numerical model that captures the heterogeneity of concrete, the interactions and the strain effect of each material, the crack propagation process under different loading conditions were simulated. Based on verifying the rationality and accuracy of the simulation method, the effect of the initial static loading on the failure process and failure mechanism of the BFRP-RC beams with different shear span ratios was analyzed. The results show that: 1) The shear capacity and deformation capacity of BFRP-RC beams increase with the increase of strain rate; 2) The strengthening effect of strain rate on the shear capacity of beams decreases with the increase of shear span ratio; 3) The stiffness and shear capacity of BFRP-RC beams increase when the strain rate increases abruptly before the peak load. In the post-peak softening section, the strain rate increases sharply, and the post-peak softening of BFRP-RC beams turns into post-peak hardening, and then the second peak load appears; 4) The dynamic shear capacity of BFRP-RC beams reduces with the increase of initial static loadings. However, whether the reduction of shear capacity is related to the subsequent strain rate depends on the level of initial static loadings; 5) The deformation capacity and damage degree of BFRP-RC beams decrease as the initial static loading increases under different strain rates, while the effect of initial static loading on the dynamic performance of beams is weakened as the subsequent strain rate increases.
雷宇霜,金浏,杜修力,余文轩. 初始静载对不同剪跨比BFRP筋混凝土梁动态剪切性能的影响[J]. 振动与冲击, 2023, 42(9): 36-46.
LEI Yushuang, JIN Liu, DU Xiuli, YU Wenxuan. Effects of initial static load on dynamic shear performance ofBFRP-RC beams with different shear span ratios. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(9): 36-46.
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