不同连接构造的预制拼装桥墩地震响应分析

Seismic response analysis of precast pier with different connection structures

为了研究预制拼装桥墩的连接构造能否形成可靠的传力机制及其抗震性能,基于一组预制拼装桥墩拟静力试验,采用ABAQUS软件建立了试验桥墩的有限元模型并结合试验结果验证其有效性。在此基础上,分析现浇、波纹管浆锚连接和榫头+波纹管连接的预制拼装桥墩的地震动力响应。之后,进一步研究轴压比和配筋率对新型带榫头构造的预制拼装桥墩地震动力响应的影响规律。结果表明:在结构形式和地震作用均相同的条件下预制拼装桥墩和现浇桥墩的动力响应结果基本一致。有榫头构造较平面接缝的预制拼装桥墩的位移响应、残余位移、塑性损伤程度更小,榫头构造提高了预制拼装桥墩的抗震性能。通过参数分析发现,轴压比越大,桥墩的位移响应以及塑性损伤程度越大,剪力响应和地震耗能更大;纵筋配筋率越大,桥墩的位移响应以及塑性损伤程度越小,剪力响应越大,但在1%~2%之间,对地震耗能的影响不显著。

To study whether the connection of precast piers can form a reliable force transmission mechanism and its seismic performance,based on a set of quasi-static tests of precast piers,we established finite element models of the test piers by ABAQUS and verified the effectiveness through test results.Then,the seismic dynamic responses of cast-in-place pier,precast pier with grouted corrugated duct connection,and precast pier with tenon-grouted corrugated duct connection were analyzed.Finally,the influence of axial compression ratio and reinforcement ratio on the seismic dynamic response of the precast pier with tenon structure was further studied.Results show that the dynamic responses of precast pier and cast-in-place pier were basically the same under the same structural form and seismic load.The displacement response,residual displacement,and plastic damage of precast pier with tenon were smaller than those with plane joint,and the seismic performance of precast pier with tenon was improved.Through parameter analysis,it was found that with the increase in the axial compression ratio,the displacement response and plastic damage of the pier were larger,and the shear response and seismic energy consumption were greater.With increasing longitudinal reinforcement ratio,the displacement response and plastic damage of the pier decreased,and the shear response increased,while the influence on the seismic energy dissipation was not significant in the range of 1%to 2%.