摘要
结构动力稳定性是结构分析的前沿课题,有着重要的理论和实际应用价值。隔震桥梁在地震时,梁相对桥墩会发生运动,导致墩所受竖向力的偏心增大,为此,需要研究隔震桥梁在地震作用下的动力稳定问题。该文探讨了动力稳定分析的原理,采用时程分析与特征值屈曲分析相结合的方法,自编程序研究了在地震作用下,隔震桥梁的弹性动力稳定问题,并以世界上首座采用橡胶铅芯隔震支座的双层交通双层桥面隔震的连续梁桥——东江大桥双层墩引桥为实例,进行了地震作用下,共8种工况的稳定计算和分析。结果表明,隔震桥梁虽然采用隔震支座,取消了固定墩,但由于墩本身的变形减小,所以仍具有非常良好的地震动力稳定性能。
Structural dynamic stability is an important aspect of structural seismic performances.When earthquake happens,a relative motion would occur between girders and piers of the isolated bridge,and the eccentric force suffered by piers would increase,therefore,dynamic stability of isolated bridges subjected to earthquake should be analyzed.In this paper,the principle of dynamic stability was discussed and the elastic dynamic stability of isolated bridges subject to earthquake was studied using the combination of time-history.Eigenvalue bucking analysis was illustrated through the example of Dongjiang bridge,which is a double-layer-pier approach bridge with double traffic double LRB isolated continuous girders.8 conditions of stability and initial eccentricity caused by temperature were considered.The results showed that： although the fixed pier is replaced by the isolated bearing,the dynamic stability under earthquake is improved because the deformations of piers become small.
出处
《工程力学》
EI
CSCD
北大核心
2010年第A02期289-293,共5页
Engineering Mechanics
关键词
隔震桥梁
动力稳定
原理
地震
时程
isolated bridge
dynamic stability
principle
earthquake
time-history
