大型渡槽设置隔震支座效果分析

Effect Analysis for Large Aqueduct with Seismic Isolation Bearing

由于缺少动力特性资料及实际运用经验,我国渡槽抗震设计无可遵循,因此,研究大型渡槽的减隔震问题,具有十分重要的现实意义。针对南水北调工程中某渡槽结构,利用双线性模型对铅芯橡胶隔震支座的非线性滞回恢复力曲线进行模拟,以有限域内附加质量法考虑水体对渡槽槽身的动力作用,进行了不同支座结构地震反应的比较分析。结果表明隔震支座可以有效降低结构的地震响应,提高结构的抗震能力,成果可为渡槽的隔震设计提供参考。

Owing to the lack of dynamic property information and experience in practical application, seismic design of aqueduct has no standard to follow in our country. Study on the seismic mitigation and isolation of large aqueduct is of great practical significance. In accordance with some aqueduct in South to North Water Transfer Project, this paper simulates nonlinear hysteretic restoring force curve of isolation bearing of the lead core rubber aqueduct by bilinear model, compares and analyzes the earthquake response considering the interaction of the aqueduct bridge and the water-body in the aqueduct. The results show that the isolation bearing can reduce the structure＇s response to the earthquake and improve the ability of anti-seismic structure.