连续梁桥钢阻尼滑板支座隔震性能试验研究  

Experimental Study of Seismic Isolation Performance of Steel Damping Sliding Bearing for Continuous Girder Bridge

作　　者：夏樟华[1] 吴应雄[1] 张银喜[2] 孔令俊[2] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]株洲时代新材料科技股份有限公司,湖南株洲412007

出　　处：《桥梁建设》2017年第6期18-23,共6页Bridge Construction

基　　金：国家自然科学基金项目(51178101)~~

摘　　要：为研究钢阻尼滑板支座对连续梁桥的隔震效果,以某25m+25m连续梁桥为原型设计制作缩尺比为1∶5的模型,通过振动台试验研究钢阻尼滑板支座的隔震性能,分析不同地震波类型、输入方向和强度对钢阻尼滑板支座隔震效果的影响。结果表明:当地震波频率接近模型桥的自振频率时,钢阻尼滑板支座的隔震效果相对较差;地震波双向输入时模型桥的加速度和位移响应大于单向输入时的响应;地震波横向输入时模型桥的地震响应大于纵向输入时的响应;输入地震动强度越大,钢阻尼滑板支座的隔震效果越明显;加速度峰值3.82m/s2的地震波作用后,模型桥中墩出现微裂缝,但不影响桥梁的正常使用,钢阻尼滑板支座的隔震效果良好。To investigate the seism ic isolation effect of the steel dam ping sliding bearing on thecontinuous girder bridge, a continuous girder bridge w ith the spans of 25 m ＋ 25 m was taken asthe prototype and the model bridge on the scale of 1 ： 5 was designed and fabricated. T he seism ic isolationperform ance of the bearing w as studied through the shake table tests and the influences ofthe different seism ic wave types, seismic input directions and seism ic intensity on the isolationeffect of the bearing w ere analyzed. T he results indicate that w hen the seism ic wave frequenciesapproxim ate the natural vibration frequencies of the model bridge, the isolation effect of the bearingis relatively poor. W hen the seism ic waves are input bidirectionally, the acceleration and displacement responses of the bridge are greater than those w hen the seism ic waves are input unidirectionally.W hen the seism ic waves are input transversely, the seismic responses of the bridge aregreater than those w hen the seism ic waves are input longitudinally. T he greater the input groundm otion intensity is, the m ore significant the isolation effect of the bearing will be. U nder the seismicwave w ith the peak acceleration of 3. 82 m /s 2 , the micro cracks appear in the m iddle pier of thebridge, but the cracks do not influence the norm al service of the bridge and the isolation effect ofthe bearing rem ains good.

关 键 词：连续梁桥 钢阻尼滑板支座 隔震性能 振动台试验 地震波 地震响应 加速度峰值 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]