地震动多点输入下固结海冰对桥墩地震反应影响研究

发布时间：2018-06-14 07:55

本文选题：固结海冰 + 桥墩　；参考：《土木工程学报》2014年S2期

【摘要】：研究固结冰包围的桥墩地震动力响应简化计算模型,并考虑不同水深、不同地震类型和行波效应条件,分析地震动多点输入下固结冰对桥墩结构地震反应的影响。结果表明:桥墩被固结冰包围时地震动一致激励下桥墩的地震反应显著大于无冰时,墩底截面最大曲率、桥墩顶部位移比无冰时增大,达到50%以上;墩底截面弯矩-曲率滞回曲线呈倒"S"形更显著,桥墩的变形和耗能能力显著下降。另外,地震动的行波效应对桥墩的地震反应有较大的影响,但随着视波速的变化并无明显的规律,不同类型的地震动作用下桥墩的最大地震反应出现在不同的视波速时。在设计固结冰包围的桥墩时应考虑地震动的多点输入,并根据固结冰的大小及地震动的类型考虑地震动行波效应。
[Abstract]:The simplified calculation model of seismic dynamic response of pier surrounded by fixed ice is studied. Considering different water depth, different earthquake types and traveling wave effect conditions, the influence of solidified ice on the seismic response of pier structure under multi-input ground motion is analyzed. The results show that the seismic response of the pier under the uniform excitation of ground motion is significantly larger than that of the bridge pier without ice, and the displacement of the top of the pier increases to more than 50% compared with that of the bridge pier without ice. The torque-curvature hysteretic curve at the bottom of the pier is more obvious in the shape of "S", and the deformation and energy dissipation capacity of the pier is decreased significantly. In addition, the traveling wave effect of ground motion has great influence on the seismic response of bridge pier, but with the change of apparent wave velocity, the maximum seismic response of pier under different types of ground motion appears at different apparent wave velocity. The multi-point input of ground motion should be taken into account when designing the pier surrounded by solid ice, and the traveling wave effect of ground motion should be considered according to the magnitude of consolidation ice and the type of ground motion.
【作者单位】：中国民航大学;
【基金】：中国民航大学科研启动基金(2013QD15S) 民航安全保障能力与持续安全发展决策系统研究课题
【分类号】：U442.55;U443.22

【相似文献】