预应力高强混凝土管桩抗震能力改善措施的试验研究  

EXPERIMENTAL STUDY ON IMPROVEMENT MEASURES OF SEISMIC RESISTANCE FOR TUBULAR PILES OF PHC

作　　者：赵长春 张留军 龚维明[2] 孟春辉 ZHAO Changchun;ZHANG Liujun;GONG Weiming;MENG Chunhui(PowerChina Roadbridge Group Co.,Ltd.,Beijing 100037,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]中电建路桥集团有限公司,北京100037 [2]东南大学土木工程学院,南京211189

出　　处：《工业建筑》2021年第1期131-134,共4页Industrial Construction

基　　金：国家自然科学基金项目(51478109)。

摘　　要：为提高预应力高强混凝土(PHC)管桩的抗震性能,提出在混凝土中加入碳纤维的方法。通过对两类四根PHC管桩的低周往复加载试验,观察试验现象、分析反映抗震性能的曲线的变化趋势,研究在混凝土中加入碳纤维对PHC管桩抗震性能的影响。研究表明:在混凝土中添加碳纤维可以改善混凝土的黏结力、提高混凝土的抗拉性能、延迟混凝土开裂,从而减弱PHC管桩的刚度退化、提高PHC管桩的刚度、强度和耗能性能。In order to improve the seismic performances of tubular piles of prestressed high-strength concrete(PHC),carbon fibers were mixed into concrete to improve seismic performances.Based on low-cycle reciprocating loading tests of 4 tubular piles of PHC for two types.The experimental phenomena were observed,and the change trend of hysteretic curves,skeleton curves,strength and stiffness degradation,ductility and energy dissipation performances were analyzed,and the influences of carbon fibers mixed into concrete on the seismic performances of PHC piles were emphatically studied.The results showed that:mixing carbon fibers into concrete could improve adhensive force of concrete,improve the tensile performances of concrete,delay concrete crack,reduce the stiffness degradation of PHC piles,improve the stiffness,strength and energy dissipation performance of PHC piles.

关 键 词：PHC管桩 抗震性能 碳纤维 低周荷载试验 

分 类 号：TU473.1[建筑科学—结构工程]