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珠海横琴二桥主桥为(100+400+100)m双向六车道公路钢桁拱桥,是目前国内在建的最大跨度的叠合混凝土桥面板钢桁拱桥。其位于7度地震区,且位于沿海软土地带,场地特征周期与结构自振周期接近,其抗震性能需要重点关注。本文采用有限元方法研究了该桥的动力特性,通过反应谱及非线性时程的分析方法,研究了不同约束体系下结构的动力响应,选择了合理的约束体系,达到了较好的减隔震效果,确保了桥型方案的顺利实施,为类似工程提供了参考。
The main bridge of Zhuhai Hengqin Second Bridge is a (100 +400 +100) m two-way six-lane highway steel truss arch bridge, which is the largest span spanned concrete bridge deck steel truss arch bridge currently under construction in China. It is located in the 7 degree earthquake area and is located in coastal soft soil. The characteristic period of the site is close to the natural vibration period of the structure, and its seismic performance needs to be focused. In this paper, the dynamic characteristics of the bridge are studied by finite element method. The dynamic response of the structure under different restraint systems is studied by means of response spectrum and nonlinear time history analysis. The reasonable restraint system is selected to achieve a better attenuation Earthquake effect, to ensure the smooth implementation of the bridge scheme for similar projects provided a reference.