地铁上盖超高层结构竖向振动台模型试验——考虑桩长的振动控制模型研究  

Study on vertical shaking table model test of super high-rise structure over subway: vibration control model considering pile length

作　　者：凌海媚 汪大洋[1] 周云[1] 梁秋河 李钧睿 丁超 柯小波 LING Haimei;WANG Dayang;ZHOU Yun;LIANG Qiuhe;LI Junrui;DING Chao;KE Xiaobo(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《建筑结构》2022年第5期36-42,共7页Building Structure

基　　金：广州市科技计划项目(202032866、202102010459);广东省科技创新战略专项资金(pdjh2020a0452)。

摘　　要：以某地铁上盖120m高超高层结构为研究对象,针对不考虑桩基础、考虑15m桩周降阻桩基础以及30m无侧摩阻力桩基础的情况,按1∶30缩尺比分别设计无桩基础、0.5m以及1m桩基础的三种振动控制结构模型(分别为TD、TE、TF模型),并对其进行了7条地铁振动波21种工况下的振动台试验,探讨桩长效应对上盖结构振动控制层的振动控制效果及对上部楼层的竖向动力响应的影响。结果表明,考虑桩基础后,结构周期延长,竖向频率降低。不同桩长模型振动控制层以及上部楼层的主频分布一致,且上盖结构动力响应均沿高度先减小后增大。TE模型振动控制层的振动控制效果最佳,且TE模型与TD模型上部楼层的竖向动力响应接近,而TF模型上部楼层的竖向动力响应则呈现放大趋势。建议采用类似振动控制设计时,应合理设计桩基降阻的高度范围,使之具有较好的振动控制效果,且对上部楼层响应不产生负面影响,同时又可降低桩基设计对隧道及地铁运行的影响。Taking a 120 m height super high-rise structure over subway as the research object, in view of the situation of not considering the pile foundation, considering the 15 m resistance-reducing pile foundation and the 30 m non-lateral friction resistance pile foundation, three vibration control structural models of pileless foundation, 0.5 m and 1 m pile foundation(TD, TE, TF model, respectively) were designed according to the 1∶30 shrinkage ratio. Shaking table tests were carried out under 21 working conditions of 7 subway vibration waves, and the influence of pile length effect on the vibration control effect of the vibration control layer of the upper cover structure and the vertical dynamic response of the upper floor were discussed. The results show that after considering the pile foundation, the structure cycle is extended and the vertical frequency is reduced. The main frequency distribution of the vibration control layer and the upper floor of different pile length models is consistent, and the dynamic response of the upper cover structure decreases first and then increases along the height. The vibration control effect of the vibration control layer of the TE model is the best, and the vertical dynamic response of the upper floor of the TE model is close to that of the upper floor of the TD model, while the vertical dynamic response of the upper floor of the TF model shows an amplification trend. It is recommended that when using a similar vibration control design, the height range of the resistance reduction of the pile foundation should be reasonably designed, so that it has a good vibration control effect, and does not have a negative impact on the response of the upper floor, and at the same time can reduce the impact of the pile foundation design on the operation of the tunnel and subway.

关 键 词：地铁上盖建筑 超高层结构 振动台试验 桩长效应 竖向振动响应 竖向振动控制效果 

分 类 号：TU375[建筑科学—结构工程] TU317.1