【摘要】 仿照拱结构静力稳定问题的分类,提出钢管混凝土拱桥在地震作用下基于Liapunov运动稳定性定义的动力第一类稳定的概念和基于极值理论的动力第二类稳定的概念,研究其动力稳定问题.前者本质上为弹性动力屈曲,通过改进的时间冻结法即动态特征值方法进行研究;后者本质上是动力极值问题,根据Budiansky&Roth失稳准则(简称B-R准则)结合动态增量法进行研究.从稳定的角度对钢管混凝土拱桥的抗震性能进行研究和探讨,结果表明其具有较高的动力稳定性能.更多还原

【Abstract】 Concept of two different categories of dynamic stability excited by earthquake is proposed by following the classification of static stability of arch structures.The first definition of dynamic stability is essentially dynamic buckling on the definition of Liapunov,which is analyzed by a modified time freezing method,i.e.dynamic eigenvalue method;the second one is actually the dynamic ultimate load carrying capacity,which is obtained by combing incremental dynamic analysis(IDA)with Budiansky & Roth(B-R)criteria.Researches and discussions on seismic behavior of concrete filled steel tubular(CFST)arch bridges are then carried out from the point of view of dynamic stability.Results show that this type of bridge is of a better performance of dynamic stability.更多还原