【摘要】 以平顶山市湛河二桥为工程背景,采用有限元程序ANSYS建立该桥的空间有限元计算模型,对其进行了动力特性分析。计算结果表明:该桥拱肋的横向刚度较桥梁的竖向刚度和扭转刚度弱,桥梁首先出现拱肋的横向振动,拱脚位置处易发生拱肋的局部横向振动,是全桥的动力薄弱部位;桥梁前几阶自振周期较长,在结构抗震设计采用振型叠加法计算时,应考虑多阶振型,以减少质量缺损带来的影响;桥梁各个构件空间协作能力较强,具有良好的整体性能。所得结论可为类似桥梁设计提供参考。更多还原

【Abstract】 The second Zhanhe bridge in the city of Pingdingshan is taken as the engineering background,its spatial finite element model is established by adopting the finite element program ANSYS,and its dynamic property analysis has been carried out.The obtained results indicate that the transverse stiffness of arch rib is weaker than the vertical and torsional stiffness of the bridge,the transverse vibration of arch rib appears first,and the local transverse vibration is prone to occurrence at the end of arch rib,so there is a dynamic weak point of the bridge;The results also show that the first several natural vibration periods are longer,the more modes of vibration should be taken into account mode-superposition method in the seismic design of the bridge,in order to decrease influence of the shortage of mass;each member of the bridge cooperates well,and the bridge has better grobal property.The conclusions can offer reference for the design of similar bridges.更多还原