复合配筋管桩抗震性能试验研究  

Experimental study on the seismic performance of the prestressed high-strength concrete pipe pile reinforced with non-prestressed steel bars

作　　者：刘畅[1,2] 孙雅楠[1] 郑刚[1,2] 刘永超[3] 胡秋斌 刘彦坡 Liu Chang1,2 Sun Yanan1 Zheng Gang1,2 Liu Yongchao3 Hu Qiubin1 Liu Yanpo1(1. School of Civil Engineering, Tianjiu University, Tianjin 300072, China; 2. Key Laboratory of Coast Civil Structure Safety of the Ministry of Education, Tianjin University, Tianjin 300072, China; 3. Tianjin Pile Foundation Technology Engineering Center, Tianjin 300301, Chin)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072 [3]天津市桩基技术工程中心,天津300301

出　　处：《土木工程学报》2018年第4期77-86,共10页China Civil Engineering Journal

基　　金：国家重点基础研究发展计划(973计划)(2010CB732106)

摘　　要：传统PHC管桩在地震作用下表现出脆性破坏特征,限制了其使用范围。已有室内试验研究结果表明,通过在PHC管桩中加入非预应力钢筋形成复合配筋管桩可提高其抗震性能。目前针对管桩破坏机理以及抗震性能的研究,主要采用室内模型试验或振动台试验,未能充分考虑实际工程中桩的受力条件和土体的作用。为研究复合配筋管桩的抗震性能,在软土地区对PHC管桩和复合配筋管桩进行了现场足尺抗震性能试验研究。试验比较了常规管桩以及掺入不同含量非预应力钢筋的复合配筋管桩的滞回曲线、骨架曲线、延性系数、曲率分布等数据,分析复合配筋管桩的抗震性能。研究结果表明:与PHC管桩相比,复合配筋管桩的抗震性能得到明显改善,且对于提高管桩延性来说,存在最优的非预应力筋配筋率。The conventional prestressed high-strength concrete （PHC） pipe pile exhibits the bratue ctamage characteristics under the actions of earthquake, which limits its applications. The experimental results show that by embedding the non-prestressed steel bars, the seismic performance of the prestressed high-strength concrete pipe pile can be improved. To study the failure mechanism and seismic performance of the prestressed high-strength concrete pipe piles, the laboratory tests or shaking table tests can be carried out, but without fully considering the forces of piles and the actions of soil in engineering practice. In order to study the seismic performance of the prestressed high-strength concrete pipe pile reinforced with non-prestressed steel bars, the full-scale field tests on seismic performance of the PHC pipe pile and the prestressed high-strength concrete pipe piles reinforced with non-prestressed steel bars in soft ground were performed. Based on the tests, the conventional PHC pipe piles and the prestressed high-strength concrete pipe piles reinforced with different contents of non-prestressed steel bars were compared for the hysteresis curves, skeleton curves, ductility coefficient and curvature distribution, and their seismic performances were analyzed. The research results show that compared to the PHC pipe pile, the seismic performance of the prestressed high-strength concrete pipe pile reinforced with non-prestressed steel bars can be improved significantly, and for the improvement of ductility performance, there exists an optimum reinforcement ratio.

关 键 词：复合配筋管桩 抗震性能 水平往复荷载 延性 最优配筋率 

分 类 号：TU473.1[建筑科学—结构工程]