U形钢筋预制拼装水池壁板湿接缝抗震性能研究

Study on the Seismic Performance of Wet Joints Used in U-bars Prefabricated Reservoir Wall Panels

预制拼装水池可以减少大量现场湿作业,有提高施工效率、减少环境污染的优势。预制拼装水池节点采用湿式连接,可以提高水池结构的整体性。本文通过非线性有限元软件ABAQUS,对8种U形钢筋搭接水池壁板节点和1种整体现浇节点建模并进行拟静力抗震数值模拟,对比了不同参数的U形钢筋搭接的湿接缝性能并研究了U形钢筋搭接长度和湿接缝的混凝土强度等级对接缝处连接可靠性的影响。研究结果表明:U形钢筋搭接的湿接缝抗震性能较好,增加U形钢筋搭接长度可以提高湿接缝的抗震性能,当搭接长度大于等于18倍U形钢筋直径时,U形钢筋湿接缝抗震性能近似等同于整体现浇,而提高湿接缝混凝土强度等级不能有效改善模型的抗震性能。

Prefabricated assembled reservoirs have the advantages of reducing a large amount of on-site wet work,improving construction efficiency,and reducing environmental pollution.For prefabricated assembled res-ervoir,the wet joints can enhance the overall integrity of the tank structure.In this paper,using the nonlinear finite element software ABAQUS,eight types of U-bars overlapped wall panel joints and one type of integral cast-in-place joint were modeled to simulate pseudo-static seismic performance.The wet joint performance of U-bars was compared with different parameters,and the influence of U-bars lap length and concrete strength grade on the connection reliability was investigated.The results showed that the seismic performance of U-bars overlap wet joints was satisfied.Increasing the U-bars overlap length,the seismic performance of wet joints im-proved obviously.When the overlap length was no less than 18 times of the U-bars diameter,the seismic per-formance of U-bars wet joints was approximately equal to that of integral cast-in-place joints.However,increas-ing the concrete strength grade of the wet joints did not effectively improve the seismic performance of the model.