人字形曲线梁桥振动台试验研究  

Shaking table test study of Y-shaped curve bridge

作　　者：李青宁[1] 尹俊红[1] 廖鑫[1] 程麦理 闫磊[1] 张瑞杰[1] 李桅[2] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]温州大学建筑工程学院,浙江温州325035

出　　处：《世界地震工程》2017年第1期122-128,共7页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(51078306);国家自然科学基金青年基金资助项目(51308419);高等学校博士学科点专项科研基金资助项目(20106120110004);浙江省自然科学基金青年基金资助项目(LQ13E080005)

摘　　要：为研究人字形曲线桥梁在地震输入下的地震反应特性,按1/20的几何比例设计制作了一座人字形曲线桥模型,进行了单向和多向输入下的振动台试验。研究了人字形桥梁结构在地震作用下的震害现象,以及多向输入对梁跨中及邻梁碰撞响应的影响。结果表明:梁体和桥墩主要表现为以弯曲裂缝为主的破坏模式,墩梁相对位移随着地震烈度的增大而增大;梁跨中加速度响应在三向和双向输入下都较单向输入为大,双向和三向输入都会使邻梁间的相对位移较单向输入时增大,更容易使结构发生碰撞;人字形桥梁结构地震响应不但与地震波输入方向有关,且与输入地震波的频谱特性和结构的形式及自身特性有关。In order to study the seismic response characteristics of Y-shaped curve bridge under the earthquake, a Y- shaped curved bridge model on the scale of 1/20 was designed and made, the shaking table experiment under unidirec- tional and multidirectional imputs were carried out. The phenomenon of Y-shaped bridge＇ s structure damage under earthquake, as well as the influence of multi-directional input on the mid-span response of the beam and the collision response of adjacent beam was researched. The results show that： the beam and pier damage mainlyis, dominated by a bending crack failure mode, the relative displacement between pier and beam increases with the increases of earthquake intensity. The acceleration responses of middle of the beam under three-directional and bidirectional input are larger than that under unidirectional input; Bidirectional and three-dimensional input will cause the relative displacement between the beams, which is more large than that caused by unidirectional input and the more likely makes the collision of structure. Y-shaped bridge structure seismic response not only depends on the direction of the seismic wave input, but also depends on spectrum characteristics of input seismic wave and structure＇s own form and characteristics.

关 键 词：人字曲线桥梁 振动台试验 震害 多向输入 地震响应 

分 类 号：U442[建筑科学—桥梁与隧道工程]