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非经典阻尼对悬索桥地震反应的影响
EFFECT OF NON-PROPORTIONAL DAMPING ON SEISMIC RESPONSES OF SUSPENSION BRIDGES
【摘要】 我国建设了四座大跨悬索桥。现代悬索桥多使用钢加劲梁和钢筋混凝土桥塔,使得其阻尼分布不均而具有非经典阻尼性质,导致主座标系的运动方程耦联。本文讨论了非经典阻尼系统运动方程的几种解法,并编制了通用软件。对青马桥和虎门桥的地震分析表明,非经典阻尼对悬索桥地震反应有明显影响,用经典阻尼解法无法得出可靠的解。
【Abstract】 Modern suspension bridges generally consist of steel stiffening deck and RC pylons and piers, that makes damping unequally distributed in complete bridges.This non-proportional damping induces coupled equations of motion of bridges in the normal coordinates.This paper discusses the for methods of solving the coupled-by-damping equations of motion and their implementation on PC computers. Seismic analysis of Tsing Ma and Humen bridges show that the non- proportional damping significantly influences seismic responses of suspension bridges, and the methods without consideraion of the non-proportional damping can not give reliable results of seismic responses of suspension bridges.
【Key words】 non-proportional damping; Rayleigh damping; Suspension bridge; seismic response;
- 【文献出处】 土木工程学报 , 编辑部邮箱 ,1999年03期
- 【分类号】U44
- 【被引频次】35
- 【下载频次】240