人字桥梁多维地震作用下振动台试验研究  

Shaking table tests for a Y-shape bridge under multi-dimensional earthquake excitation

作　　者：李青宁[1] 尹俊红[1] 闫磊[1] 程麦理 廖鑫[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,西安710055 [2]温州大学建筑工程学院,浙江温州325035

出　　处：《振动与冲击》2015年第15期103-108,126,共7页Journal of Vibration and Shock

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：按1/20的几何比例制作一典型人字曲线桥梁模型,进行了多维振动台试验,并针对试验模型建立数值分析模型,研究人字曲线桥梁在多维地震作用下的地震响应特点。结果表明,竖向地震分量对桥墩顶纵桥向加速度、主梁分支处两桥墩横桥向相对位移和墩底纵桥向弯矩基本无影响,结构响应与输入地震波的频谱特性和结构形式有关;单向激励下,墩顶纵桥向加速度、分支处桥墩横桥向相对位移和墩底纵桥向弯矩响应都为最大;双向和三向激励都使墩顶纵桥向加速度响应降低,且降低幅度随着墩与直梁正向角度的增加而增加;主梁与分支直梁应设置的初始间隙应大于主梁与分支曲梁。A scale 1 /20 model of a typical Y-shaped curve bridge was made and its multi-dimensional shaking table tests were conducted. Its numerical analysis model was established,the seismic response characteristics of the Y-shaped curve bridge under multi-dimensional seismic excitation were studied. The results showed that the vertical seismic input has no effects on the vertical seismic input has no effects on the longitudinal acceleration at the pier top,the transverse relative displacement between two piers at the branch of the main beam and the longitudinal bending moment at the pier bottom,the structural response is related to the input seismic spectrum and structure form; the three ones mentioned above reach the maximum under unidirectional excitations; the longitudinal acceleration at the pier top drops under bidirectional excitations and three-dimensional excitations,and the reduction level increases with increase in the angle between pier and straight beam; the initial gap between the main beam and the branch straight beam should be larger than that between the main beam and the branch curve beam.

关 键 词：人字曲线桥梁 振动台 多维输入 地震响应 数值分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]