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混合配筋管桩拟静力试验研究*
徐金1,2,窦远明2
摘 要

(1 中国民航大学机场学院, 天津 300300; 2 河北工业大学土木与交通学院, 天津 300401)

[摘要]对PHC管桩和不同配筋强度比的PRC管桩进行拟静力试验研究,并使用弹簧来模拟桩周土作用。参考天津滨海新区地质条件设置弹簧参数,使之更符合实际的受力性能。分析试验得到的滞回曲线、骨架曲线和耗能能力等来研究管桩在往复荷载作用下的抗震性能,找到非预应力钢筋和预应力钢筋的最佳配筋强度比。结果表明,PRC管桩滞回曲线更饱满,延性更好;增加非预应力钢筋能改善PHC管桩延性,而非预应力钢筋配筋率过大也会造成混凝土在钢筋屈服前被压碎,非预应力钢筋和预应力钢筋的配筋强度比应保持在0-4~0-8之间。

[关键词]PHC管桩; PRC管桩; 抗震性能

中图分类号:TU378文献标识码:A文章编号:1002-848X(2019)14-0113-04

 

Pseudo static test study on hybrid reinforced concrete pipe pile

Xu Jin1,2, Dou Yuanming2

(1 Airport College, Civil Aviation University of China, Tianjin 300300, China; 2 College of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract:Pseudo static tests of PHC pipe piles and PRC pipe piles with different reinforcement ratios were carried out, and the spring was used to simulate soil action around piles. The spring parameters were set up according to the geological conditions of Tianjin Binhai New Area to make it more consistent with the actual mechanical performance. The seismic behavior of pipe pile under cyclic loading was studied by hysteretic curve, skeleton curve and energy dissipation capacity from the test, and the optimum reinforcement strength ratio of non-prestressing steel bar and prestressing steel bar was obtained. The results show that  PRC pipe pile has fuller hysteretic curve and better ductility. Increasing the non-prestressing steel bar can improve the ductility of PHC pipe pile. The excessive reinforcement ratio of non-prestressing steel bar will also cause the concrete to be crushed before the steel bar yields. The strength ratio of non-prestressing steel bar and prestressing steel bar should be kept between 0-4~0-8.

Keywords:PHC pipe pile; PRC pipe pile; seismic behavior

 

*中央高校科研基金项目(3122018D021)。

 

作者简介:徐金,硕士,实验师,Email:xujin1998@126.com。

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