长期持荷后玄武岩纤维增强聚合物筋钢纤维高强混凝土梁在重复荷载下的变形性能

DEFORMATION BEHAVIOR OF STEEL FIBER REINFORCED CONCRETE BEAMS WITH BASALT FRP BARS UNDER REPEATED LOAD AFTER SUSTAINED LOADING

为了研究经历长期持荷后的玄武岩纤维增强聚合物(BFRP)筋钢纤维高强混凝土梁在重复荷载作用下的变形性能,进行了7根BFRP筋钢纤维高强混凝土梁的受弯试验,分析BFRP筋配筋率、钢纤维体积率以及加载水平等因素对梁的变形性能的影响。结果表明:经过10次卸载、加载循环后,受力BFRP筋与混凝土之间的黏结性能没有发生退化;荷载水平、钢纤维掺量及BFRP筋配筋率对BFRP筋钢纤维高强混凝土梁的加载-卸载挠度曲线及挠度恢复能力有不同程度的影响;BFRP筋钢纤维高强混凝土梁具有较高的变形恢复能力和良好的抗重复荷载性能。

In order to study the deformation performance of steel fiber reinforced high-strength concrete beams with BFRP rebars, the bending test of 7 beams under repeated load after suffering long-term sustaining load were carried out.The effects of reinforcement ratio of BFRP bars , fraction of steel fiber by volume and loading level on deformation performance of beams were analyzed .The results shown that the bonding behavior between BFRP rebars and concrete is not degradative after 10 loading-unloading cycles;the factors,including loading level , the dosage of steel fiber and the reinforcement ratio of BFRP , express the different levels of influence on the load-deflection curve and the deflection recovery capability of test beams;and steel fiber reinforced high-strength concrete beams with BFRP rebars possess higher deflection recovery capability and better repeated load resistance .