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

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (9) : 36-46.

论文

雷宇霜,金浏,杜修力,余文轩

作者信息 +

Effects of initial static load on dynamic shear performance ofBFRP-RC beams with different shear span ratios

LEI Yushuang, JIN Liu, DU Xiuli, YU Wenxuan

Author information +

文章历史 +

摘要

为揭示初始静载对玄武岩纤维增强(basalt fiber reinforced polymer,BFRP)筋混凝土(BFRP-RC)梁动态剪切性能的影响，本文建立了考虑混凝土非均质性、混凝土与BFRP筋间相互作用及各材料应变率效应的三维细观数值模型。在验证了该模拟方法合理性与准确性的基础上，分析了初始静载对不同剪跨比BFRP-RC梁破坏过程与失效机制的影响。研究结果表明: 1) BFRP-RC梁的抗剪承载力及变形能力均随应变率增大而提高；2) 应变率对梁抗剪承载力的增强作用随剪跨比增大而减弱；3) 在峰值荷载前应变率突增，BFRP-RC梁的刚度增加，抗剪承载力提高；在峰后软化段应变率突增，BFRP-RC梁的峰后软化转变为峰后硬化，而后出现第二峰值荷载；4) BFRP筋混凝土梁的动态抗剪承载力均随初始静载增大而降低，但梁抗剪承载力的降低量是否与后续应变率有关取决于初始静载水平；5) 在各应变率下，BFRP筋混凝土梁的变形能力及损伤程度均随初始静载的增大而减小，但增大后续应变率会削弱初始静载对梁动态性能的影响。

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.

导出引用

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 ofBFRP-RC beams with different shear span ratios[J]. Journal of Vibration and Shock, 2023, 42(9): 36-46

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