钢管混凝土模型拱的弹性动力稳定性研究

Research on Elastic Dynamic Stability of Concrete Filled Steel Tube Arch Model

以一钢管混凝土模型拱桥为例 ,首次进行了此类桥型在地震激励下的动力稳定性分析 ,探讨了结构动力稳定临界荷载的判定方法 ,初步建立了适合拱结构的动力稳定性判别准则 ,并研究了初始几何缺陷和地震加速度输入方向对动力稳定性能的影响 ,为进一步研究实际结构的动力稳定性能打下了基础 .

The study on elastic dynamic stability of concrete filled steel tube(CFST) arch model under earthquake excitation is carried out,some methods of predicating elastic dynamic critical load are discussed and the preliminary criterion for determining the dynamic instability of arch structure is suggested.The effect of initial geometric imperfection and the input direction on the dynamic stability are also studied,which provides the basement for future researches on dynamic stability of practical CFST arch bridges.