PHC管桩与承台连接节点试验研究与有限元分析

发布时间：2019-06-03 19:03

【摘要】：对4个预应力高强混凝土(PHC)管桩与承台连接节点进行了低周往复荷载试验,描述了试件的破坏过程和形态,分析了桩身混凝土、锚固钢筋以及碳纤维约束预应力混凝土管桩(CFRP)的应变,对构件的滞回曲线、承载力和位移延性等进行了研究.试验结果表明,在弯矩作用下,节点区域混凝土被压碎,节点区锚固钢筋约束减弱,形成铰接点,节点转动能力变大;在桩身混凝土中掺入钢纤维以及配置非预应力筋可以提高节点的位移延性;在进行节点设计时,应保证承台不会由于桩端转动时产生的挤压力或撬力作用过早地发生破坏.采用有限元分析软件Open Sees对节点在往复荷载作用下的受力性能进行了模拟分析,计算结果和试验结果吻合较好.
[Abstract]:The low cycle reciprocating load tests of four prestressed high strength concrete (PHC) pipe piles and cap joints are carried out, the failure process and shape of the specimens are described, and the concrete of the pile body is analyzed. The hysteretic curve, bearing capacity and displacement toughness of anchoring steel bar and carbon fiber confined prestressed concrete pipe pile (CFRP) are studied. The test results show that under the action of bending moment, the concrete in the joint area is crushed, the constraint of anchoring steel bar in the joint area is weakened, and the articulation point is formed, and the rotation capacity of the joint becomes larger. The displacement toughness of the joint can be improved by adding steel fiber into the concrete of the pile body and configuring the non-prestressed tendons. In the design of the joint, it should be ensured that the cap will not be destroyed prematurely due to the extrusion pressure or prying force caused by the rotation of the pile end. The finite element analysis software Open Sees is used to simulate and analyze the mechanical properties of joints under reciprocating loads. The calculated results are in good agreement with the experimental results.
【作者单位】：天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);
【分类号】：TU473.1

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