矿渣高性能混凝土剪力墙高温后抗震性能试验研究

Test on the seismic behavior of BFS-HPC shear walls after high temperature

本文完成了3榀受高温作用后与1榀未受高温作用的矿渣高性能混凝土剪力墙在低周反复荷载作用下的抗震性能对比试验。在对试验现象与侧向变形图分析的基础上,对比研究了试件荷载-水平位移滞回曲线,荷载-水平位移骨架曲线,耗能曲线与刚度退化曲线,并对刚度退化规律进行了函数拟合,讨论了高温后矿渣高性能混凝土剪力墙的破坏机理,研究了高温作用以及掺加聚丙烯纤维对剪力墙抗震性能的影响。试验结果表明,高温作用会降低矿渣高性能混凝土剪力墙的抗震能力,而掺加聚丙烯纤维可以显著提高矿渣高性能混凝土剪力墙高温后的抗震性能。

pieces of shear wall models,which were made of high performance concrete with blast furnace slag (BFS HPC) and 3 of them had been exposed to high temperature,were tested and studied under low frequency cyclic loading. Based on the investigation of experimental phenomena and lateral deformation figures, this paper undertook and analyzed the load vs. horizontal displacement hysteresis curves, load vs. horizontal displacement skeleton curves, energy dissipation capacity curves, stiffness degradation curves, and simulated stiffness degradation with exponential function. The failure mechanism of HPC shear wall after high temperature was analyzed, and effects of high temperature and polypropylene fiber on seismic behavior of BFS HPC shear walls were also studied. Experimental results showed that high temperature will decrease seismic bearing capacity of HPC shear walls, while polypropylene fiber can greatly improve the seismic behavior of BFS HPC shear walls after high temperature.