Abstract

Seven specimens of high-performance polypropylene fiber-reinforced lightweight aggregate concrete (HPPLWC) columns and three specimens of lightweight aggregate concrete (LWAC) columns were tested under low cycle reciprocating loading to study the seismic behavior of HPPLWC columns. The effects of axial compression ratio, stirrup ratio and high-performance polypropylene fiber (HPPF) content on the seismic behavior of LWC columns were studied. The effectiveness of HPPFs to supersede stirrups under earthquake was also discussed. Through the study of the failure phenomenon, hysteretic curve, ductility, energy dissipation, stiffness degradation, shear capacity, and other test results, it was found that: The additional HPPF could effectively inhibit the development of cracks and ameliorate the failure mode of specimens. The enhancement effect of HPPF on ductility and energy dissipation of specimens was much higher than that of increasing stirrup ratio. The calculated value of shear capacity formula given by NZS3101 in New Zealand was in good agreement with the experimental results, providing a reference for the supplement and perfection of the LWAC code formula. The low stirrup ratio HPPLWC specimens and the high stirrup ratio LWAC specimens were similar to the seismic performance. Therefore, HPPFs could effectively supersede some stirrups in the seismic application of complex structures.

摘要

在低周往复荷载下测试了 7 个高性能聚丙烯纤维增强轻骨料混凝土 (HPPLWC) 柱试件和 3 个轻骨料混凝土 (LWAC) 柱试件，以研究 HPPLWC 柱的抗震性能。研究了轴压比、箍筋比和高性能聚丙烯纤维（HPPF）含量对LWC柱抗震性能的影响。还讨论了 HPPFs 在地震下取代箍筋的有效性。通过对破坏现象、滞回曲线、延性、耗能、刚度退化、抗剪承载力等试验结果的研究，发现：添加HPPF能有效抑制裂纹的发展，改善试件的破坏模式。HPPF对试件延性和耗能的增强作用远高于增加箍筋比。新西兰NZS3101给出的抗剪承载力公式计算值与实验结果吻合较好，为LWAC规范公式的补充和完善提供了参考。低箍筋比 HPPLWC 试件和高箍筋比 LWAC 试件的抗震性能相似。因此，HPPFs 可以有效地替代一些箍筋在复杂结构的抗震应用中。为LWAC码公式的补充和完善提供参考。低箍筋比 HPPLWC 试件和高箍筋比 LWAC 试件的抗震性能相似。因此，HPPFs 可以有效地替代一些箍筋在复杂结构的抗震应用中。为LWAC码公式的补充和完善提供参考。低箍筋比 HPPLWC 试件和高箍筋比 LWAC 试件的抗震性能相似。因此，HPPFs 可以有效地替代一些箍筋在复杂结构的抗震应用中。