地震作用下高架桥梁碰撞应力波测量与分析

发布时间：2018-01-13 14:23

本文关键词：地震作用下高架桥梁碰撞应力波测量与分析　出处：《地震工程与工程振动》2014年S1期 　论文类型：期刊论文

【摘要】：地震作用下高架桥梁相邻主梁之间、主梁与墩台以及主梁与挡块之间会由于相对位移过大而发生碰撞。碰撞不仅会使结构内力增加而引发损伤,还会由于冲击作用产生应力波。碰撞应力波会加剧结构的损伤,也会对桥梁碰撞试验的数据采集例如加速度信号造成影响。本文基于声发射传感器构建了桥梁碰撞应力波采集系统,并通过振动台试验采集得到了碰撞应力波信息,结合波动理论,分析了应力波的特性和传播规律;利用时频分析理论,研究了桥梁不同位置处碰撞应力波的时频特性和应力波能量分布规律。
[Abstract]:Under earthquake action, there will be collisions between the adjacent main beams of elevated bridges, between the main girder and pier abutment and between the main beam and the block because of the excessive relative displacement. The collision will not only increase the internal force of the structure but also cause damage. Stress waves will also be produced by impact. Collision stress waves will aggravate the damage of structures. It will also affect the data acquisition of bridge collision test such as acceleration signal. This paper constructs a bridge collision stress wave acquisition system based on acoustic emission sensor. The information of collision stress wave is obtained by shaking table test, and the characteristics and propagation law of stress wave are analyzed in combination with wave theory. Based on time-frequency analysis theory, the time-frequency characteristics and energy distribution of collision stress waves at different locations of bridges are studied.
【作者单位】：哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金(51308170) 中国博士后科学基金(2013M541384) 中央高校基本科研业务费专项资金(HIT.NSRIF.2014105)资助
【分类号】：U442.55
【正文快照】： 引言地震作用下建筑结构和高架桥梁的碰撞主要发生在抗震缝或伸缩缝处,相邻结构间的碰撞会引发结构位移和加速度响应增大,应力提高,从而使结构或构件进入非线性状态,引起混凝土开裂、脱落、伸缩缝挤压破坏,甚至引起桥梁结构的落梁和倒塌破坏等[1,2]。碰撞过程是一个复杂的冲击

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