地铁振动下的钢筋混凝土剪力墙结构振动台试验研究

SHAKING TABLE TEST OF REINFORCED CONCRETE SHEAR WALL STRUCTURES UNDER METRO-INDUCED VIBRATION

  • 摘要: 地铁引起的振动可能会对附近建筑中人们的工作生活和设备的正常使用产生影响。钢筋混凝土剪力墙结构常被用于各类住宅、办公、公共建筑中,为研究剪力墙结构在竖向地铁振动下的振动响应,该研究以一座10层剪力墙结构作为原型结构,采用4条现场实测地铁振动作为输入,开展了1/10缩尺振动台试验。明确了结构的动力特性,识别了楼板中点和角点位置处的竖向加速度响应特性,以及竖向加速度沿建筑物高度的分布特性。研究结果表明:结构在竖向地铁振动下基本保持弹性;竖向加速度随着楼层增加呈曲折上升趋势,竖向加速度放大系数出现在第9层,最大值达到了6.13;9层楼面的最大振动强度是1层楼面的1.13倍,是台面的1.29倍;楼板中心位置的竖向加速度远高于楼板角点位置的竖向加速度,相对差异在14%~30%。该研究的试验结果可为相关研究的深入开展提供重要参考。

     

    Abstract: Metro-induced vibration may impact the comfortability of people and the operation of equipment in buildings adjacent to metros. To study the vibration responses of reinforced concrete (RC) shear wall structures under vertical metro-induced vibration, a 10-story RC shear wall structure was designed as the prototype structure, and four on-site measured metro-induced vibrations were adopted as inputs to perform 1/10-scaled shaking table tests. The dynamic characteristics of the structure were clarified. The distributions of vertical acceleration response along the horizontal floor slab and the building height were identified. The results indicate that the structure basically remains elastic under the metro-induced vibrations. The vertical acceleration generally increases with the increase of the height, and the maximum acceleration amplification coefficient appears on the 9th floor with a maximum value up to 6.13. The maximum vibration intensity of the 9th floor is 1.13 times that of the 1st floor and 1.29 times that of the shaking table. The vertical acceleration at the center of the floor is much higher than that at the corner of the floor, with a relative difference of 14% to 30%. The experimental results of this research can provide important reference for further investigation on relative studies.

     

/

返回文章
返回