不同设计参数对连续梁桥抗震影响分析

Analysis of Different Design Parameters on Aseismic Influence of Continuous Girder Bridge

利用有限元分析软件ANSYS对某一个五跨连续梁桥建立模型,并对该模型进行动力特性的分析,通过改变该桥梁模型的跨数、桥墩高度和刚度,得到模型结果及相应参数,进而分析地震对于此类桥型的影响,并且根据分析结果,用弹性动态时程分析法研究了此类连续梁桥的抗震性能。通过分析得出:跨径为六跨时桥梁抗震性能最好,适当降低桥墩的柔性可以增大桥梁的抗震性能,而桥墩高度对于此类桥梁抗震性能的影响是随着桥墩的增高先增大再减小。

The model of a 5 span continuous girder bridge is established using the finite element analysis software ANSYS to analyse and study the dynamics characteristics of the model. Through changing the influence factors of the across several of the bridge model, bridge pier height and stiffness, the conclusion and the corresponding parameters of the model are achieved, then the influence of earthquake on the continuous girder bridge is analyzed. Based on the conclusion, the earthquake resistance ability of the continuous buride is studied by using the dynamic time history analysis method. And the analysis results show that six-cross bridge seismic performance is best than those of the other bridges. Appropriately reducing flexible can increase the seismic performance of the bridge piers, and the influence of the bridge pier height on the earthquake resistance of this kind of continuous girder bridge is increased and then decreased with increaseing of the bridge pier first.