论文部分内容阅读
大跨度悬索桥几何非线性主要来自3个方面:缆索垂度效应、梁柱效应、大位移引起的几何形状变化。鉴于地震波高频成分振幅大,低频成分振幅小的特点,很难对地震作用下大跨度悬索桥几何非线性的影响做出定性判断。目前大跨度桥梁的几何非线性研究主要集中在斜拉桥,且不同的学者得出了不同的结论。本文以逐级加大振幅的Ⅳ类场地多条地震波为激励,通过对称与非对称的2座典型大跨度悬索桥的几何非线性影响对比分析,探讨了几何非线性对大跨度悬索桥重要地震响应量的影响程度及其原因,并提出了相应的抗震设计参考建议。
The geometric nonlinearity of the long-span suspension bridge mainly comes from three aspects: the cable sag effect, the beam-column effect, the geometric shape change caused by the large displacement. Due to the large amplitude of the high-frequency seismic wave components and low amplitude of the low-frequency components, it is difficult to make qualitative judgments on the geometric nonlinearity of the long-span suspension bridge under earthquake. At present, the research of geometric nonlinearity of long-span bridges mainly focuses on cable-stayed bridges, and different scholars have drawn different conclusions. In this paper, a large number of class Ⅳ seismic amplitude increases step by step to stimulate a large number of seismic symmetry and asymmetry of two typical large-span suspension bridge geometric nonlinear analysis of the impact of geometric nonlinearity of the long-span suspension bridge important seismic response The extent of the impact and its causes, and put forward the corresponding seismic design reference.