【摘要】 利用有限元分析软件ANSYS对天津至秦皇岛客运专线戴河大桥的钢管混凝土简支系杆拱桥进行建模,对该桥梁模型进行模态分析,提取了桥梁在无预应力、0.5倍预应力、全预应力三种情况下前十阶的自振频率,分析了预应力对结构阵型和频率的影响,得出结论:预应力的施加对桥梁的振型影响不大,但是会使桥梁的竖向自振频率略微降低,扭转自振频率略有提高,拱肋的振动也有不同程度的提高.更多还原

【Abstract】 By using finite element analysis software ANSYS,this paper develops a modeling framework for the Dai He Simply Supported Concrete-filled Steel-tabular Tie-bar Arched Bridge which is one part of the Tianjin to Qinhuangdao passenger special line.Through model analysis,the self-vibration frequencies of this bridge’s anterior ten steps were extracted in three cases: no pre-stress,a half pre-stress and full pre-stress.By analyzing the influence of pre-stress on the structural vibration mode and frequency,the paper came to the conclusion that with little effect on the vibration mode of the bridge,the pre-stress on the bridge will slightly reduce the frequency of vertical vibration,more or less heighten the frequency of torsional vibration and increase the vibration of arch in different degrees.更多还原