模数式桥梁伸缩缝水平向动力学响应分析

运用有限元分析软件对模数式桥梁伸缩缝进行水平向动力学研究,建立了其水平向有限元动力学模型,研究了车轮对中梁的水平冲击以及车速、中梁弹性支承刚度及预压量、滑动摩擦系数和剪切弹簧刚度的变化对中梁水平位移的响应特性。研究表明,当车速高于100 km/h,中梁弹性支承刚度小于70 000 N/mm时,应考虑车轮对中梁的水平冲击,当车速低于120 km/h,中梁弹性支承刚度及预压量分别大于80 000 N/mm和0.3 mm,滑动摩擦系数大于0.03,剪切弹簧刚度大于400 N/mm时,此时中梁水平位移小于0.5 mm,且车轮对中梁的水平冲击也可不考虑。

Horizontal Dynamic Response Analysis of Modular Bridge Expansion Joints

Horizontal dynamics of the modular bridge expansion joints was researched by using fi- nite element analysis software, horizontal element dynamic model was established, the wheels＇ horizontal ipmact on center beam, changes of vehicle velocity, stiffness and preload of center beam elastic support, coefficient of sliding friction and stiffness of shear spring on response characteristics of horizontal displace- ment of center beam were researched. The research shows when vehicle velocity is more than 100 km/h, stiffness of center beam elastic support is less than 70 000 N/mm, the wheels＇ horizontal ipmact on cen- ter beam should be considered, when vehicle velocity is less than 120 km/h, stiffness and preload of center beam elastic support are more than 80 000 N/mm and 0.3 mm, coefficient of sliding friction is more than 0.03, stiffness of shear spring is more than 400 N/mm, at this moment, horizontal displace- ment of center beam is less than 0.5 mm, and the wheels＇ horizontal ipmact on center beam may also not be considered.