反复荷载作用下改善的PHC管桩的抗震性能试验研究

Test Study on Seismic Behavior of the Improved PHC Pipe Piles under Low Cyclic Loading

为了研究PHC(预应力高强混凝土)管桩的抗震性能,对6个添加非预应力筋、混凝土掺入1.0%钢丝端钩型钢纤维及进行填芯改善措施的PHC管桩试件进行了低周往复加载试验,对各试件的承载能力、位移、延性、耗能能力及累积损伤进行了分析,研究了不同改善措施对PHC管桩抗震性能的影响。结果表明:混凝土掺入1.0%钢丝端钩型钢纤维并加入非预应力筋或者进行填芯且加入非预应力筋的措施,可以明显提高试件的变形能力及延性,改善试件的滞回特性和耗能能力,提高了试件的抗震性能。

In order to study the seismic behavior of PHC(Prestressed High Concrete) pipe piles,the low cyclic loading test of 6 PHC pipe piles,which are added non-prestressed steel bars and concrete of adding 1.0% wire end hook steel fiber and center filler,is carried out.The bearing capacity,displacement,ductility,energy dissipation and accumulated damage are analyzed.Different improvement measures have an impact on the PHC pipe pile seismic performance.The results indicate that adding to concrete 1.0% wire end hook steel fiber and centre filler or adding non-prestressed steel bars and centre filler can enhance the deformation capacity and ductility of specimens,and the hysteretic characteristic and energy dissipation are improved.