桥梁碰撞振动台试验及参数敏感性分析  

Shaking table test of bridge pounding and analysis on parameter sensitivity

作　　者：李青宁[1] 尹俊红[1] 张瑞杰[1] 孙建鹏[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《长安大学学报（自然科学版）》2016年第4期58-65,共8页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51078306;51408453);高等学校博士学科点专项科研基金项目(20106120110004;20136120120022)

摘　　要：为研究桥梁结构在地震作用下的碰撞数值模拟方法和碰撞响应特点,设计制作了4组简化碰撞结构试件,进行了振动台试验;将线弹性、Kelvin-Voigt、Hertz、Jan-Hertz-damp这4种接触单元模型引入数值模拟分析中,对试验结果进行数值验证;并进行了桥梁结构碰撞参数敏感性研究。研究结果表明:Jan-Hertz-damp接触单元模型数值模拟精度最高,但计算时间相对较长;在桥梁伸缩缝处设置接触刚度较小的材料,以及增加桥梁结构自身阻尼和相邻联阻尼比差别,都可降低桥梁结构碰撞力响应;随着伸缩缝宽度的增大,碰撞力总体上是减小的;碰撞力响应与桥梁联跨自身动力特性、输入地震波的峰值以及频谱分布有关。To study the numerical simulation method and characteristics of bridge pounding response under earthquake, four specimens of structure for pounding were designed, and the shaking table test was carried out. Four kinds of models such as the linear elastic, Kelvin-Voigt and Hertz, as well as Jan-Hertz-damp were introduced to the numerical simulation analysis, the results of test were validated numerically, and impact of bridge pounding on parameter sensitivity was studied. The results show that the accuracy of Jan-Hertz-damp contact element model is the highest in simulation analysis, but it takes a relatively long time to run. Setting materials with small contact stiffness at the bridge expansion joints and increasing the difference of bridge damping and adjacent damping ratio can reduce the impact force response of bridge structures. Impact force of bridge is not sensitive to width of expansion joint. With the increase of width of bridge expansion joint, the overall trend of impact force is reduced. Impact force response is related to dynamic characteristics of bridges, as with peak and spectrum character of input seismic wave. 8 tabs, 9 figs, 20 refs.

关 键 词：桥梁工程 桥梁碰撞 振动台试验 碰撞力 接触单元 接触刚度 阻尼比 伸缩缝宽度 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]