Study on seismic performance of improved high-strength concrete pipe-pile cap connection
Study on seismic performance of improved high-strength concrete pipe-pile cap connection
复制标题
改进型高强混凝土管桩承台连接抗震性能研究
DOI：
10.1155/2020/4326208
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发表时间：
2020
影响因子：
--
通讯作者：
Nan Bo
中科院分区：
文献类型：
--
作者：
Yang Zhijian;Li Guochang;Nan Bo
对4个预应力高强混凝土桩-承台节点进行了低周反复荷载试验，研究了试验现象、破坏模式、滞回性能、延性和承载力。PHC桩采用钢纤维、异形钢筋和碳纤维布加固。试验结果表明，连接件是弯曲破坏。承台的混凝土被挤压压碎。节点混凝土破碎后形成铰缝，使节点转动不受限制，节点转动能力增大。采用钢纤维和异形钢筋相结合的预应力混凝土管桩可以提高节点的位移延性。采用有限元软件ABAQUS对桩帽连接的非线性性能进行了模拟。预测结果与实验结果吻合较好。研究了试件的应力和应变。接头应设计有足够的转动能力，并保证桩端转动不会挤压或撬动承台。
Four prestressed high‐strength concrete pile‐ (PHC pile‐) pile cap connections under low‐cycle loading were tested to study the test phenomena, failure modes, hysteretic performance, ductility, and bearing capacity. The PHC piles were reinforced with steel fiber and deformed bars and CFRP. The tests results showed that the connections were damaged by bending. The concrete of the caps were squeezed to be crushed. The concrete of connection was crushed and formed a hinge joint that resulted in the connection rotating unrestricted, and the rotation capacity of connection increased. The PHC pile reinforced with steel fiber and deformed bars can improve the displacement ductility of the connections. The finite element software ABAQUS was used to simulate the nonlinear behavior of pile‐cap connections. The prediction agreed relatively well with the experimental results. The stress and strain of specimens were studied. The connections should be designed with enough rotating capacity and make sure the cap will not be damaged by squeezing or prying due to the rotation of pile end.