减隔震装置在特大型渡槽中的应用

Application of seismic reduction and isolation device to especially large-scale aqueduct

国内外特大型渡槽运用减、隔震技术的实例较少。研究大型渡槽的抗震问题,并采取安全、经济、可靠的隔减震装置,以有效减轻地震灾害的影响,具有十分重要的现实意义。通过对双洎河渡槽所采用隔减震装置——摩擦摆式减震支座的设计应用研究,和建立流固耦合有限元模型进行数模计算,分析了特大型隔震渡槽的地震反应。研究结果表明,采用隔震支座可以延长渡槽结构的基本抗震周期,横向隔振率在69%～85%之间,墩顶位移减小30%～50%左右,发挥了较好的减隔震作用,从而提高了渡槽结构的整体抗震安全性。

Seismic reduction and isolation technique is used less in large aqueduct design at home and abroad. So, studing aqueduct seismic problem, and taking the safe, economical and reliable seismic isolation devices to reduce the impact of the earthquake disaster,have a very important practical significance. The authors researched the de- sign and application of seismic isolation device for Shuangji River aqueduct-friction pendulum isolation bearing, calculated the seismic response of large-scale aqueduct by fluid-structure interaction finite element model . The re- sults show that using isolator can extend the fundamental period of large aqueduct, lateral isolation rate is between 69% -85% , pier top displacement is reduced by about 30% ～ 50%.