隔震斜交连续梁桥地震反应及环境温度影响研究

发布时间：2018-02-22 19:09

  本文关键词： 斜交桥 隔震设计 铅芯橡胶支座 环境温度 地震碰撞 斜度　出处：《振动与冲击》2014年14期 　论文类型：期刊论文

【摘要】：针对斜交桥震害特点及低温环境改变隔震支座力学特性现象,以用铅芯橡胶隔震支座的斜交连续梁桥为例,采用Hertz-damp模型考虑梁体与桥台的碰撞作用。基于OpenSees地震分析平台建立动力分析模型,分析桥墩位移、墩底反力、碰撞力、梁体旋转度与斜交桥斜度关系及梁端碰撞力分布规律。在对比不同隔震支座温度特性修正方法差异基础上,讨论隔震斜交桥梁地震反应与环境温度及斜度关系。结果表明,梁体双向水平与平面内转动耦合使梁体与桥台在其钝角处先发生碰撞,而碰撞作用会加剧梁体转动;低温引起的支座特性改变将会放大桥墩地震反应,若不计其影响,在0℃、-10℃、-30℃条件下,与常温(23℃)相比墩底剪力及弯矩会被低估10%、20%、40%。
[Abstract]:In view of the earthquake damage characteristics of skew bridge and the phenomenon of changing the mechanical characteristics of isolation bearing in low temperature environment, taking the skew continuous beam bridge with lead-rubber bearing as an example, The Hertz-damp model is used to consider the collision between beam and abutment. Based on the OpenSees seismic analysis platform, the dynamic analysis model is established to analyze the displacement of the pier, the reaction force at the bottom of the pier, and the collision force. On the basis of comparing the difference of temperature characteristic correction methods of different isolation bearings, the relationship between seismic response and environment temperature and slope of isolated oblique bridge is discussed. The results show that, based on the analysis of the relationship between the rotation degree of beam and the inclination of skew bridge and the distribution of collision force at the end of the beam, the relationship between the seismic response and the environmental temperature and slope is discussed. The coupling of two-way horizontal and in-plane rotation of the beam makes the beam and abutment collide at its obtuse angle first, and the impact will aggravate the rotation of the beam, and the change of the bearing characteristics caused by low temperature will amplify the seismic response of the bridge pier, if its effect is not taken into account, At 0 鈩，

本文编号：1525085