Research on the Seismic Performance of a Large-Section Rectangular Prefabricated Metro Station Structure Constructed by Pipe Jacking
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摘要: 为研究大断面矩形顶管车站结构的抗震性能,设计开展了整体结构1∶5缩尺模型拟静力试验和纵缝接头足尺模型拟静力试验。试验结果表明:在整体结构缩尺模型拟静力试验中,结构出现裂缝时的水平力约为设计地震作用的7.5倍,当结构的顶部水平力达到设计地震作用的9倍时,结构骨架曲线基本仍处于弹性阶段;接头的滞回曲线形状均呈现梭形,滞回曲线峰值荷载后能保持一定的下降段,具备较好的变形能力,接头在达到峰值荷载后还有较强的耗能能力,抗震性能表现良好;该顶管车站预制结构和接头形式合理,抗震性能满足设计要求。Abstract: In order to study the seismic performance of a large-section rectangular prefabricated metro station structure constructed by pipe jacking, quasi-static tests were conducted on a 1∶5 scale model of the overall structure and a full-scale model of the longitudinal joint. The test results indicated that during the quasi-static test of the scaled model, the horizontal force at the initial appearance of cracks was approximately 7.5 times the design seismic action. When the top horizontal force at the top of the structure reached 9 times the design seismic action, the skeleton curve of the structure remained essentially in the elastic stage. The hysteresis curve of the joint generally presented a spindle shape, with a discernible descending section after reaching the peak load. Moreover, the joint maintained strong energy dissipation capacity after reaching the peak load, indicating satisfactory seismic performance. The lining structure and joint form adopted in the metro station are reasonable, and its seismic performance meets the design requirements.
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