(广州大学土木工程学院, 广州 510006)

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.

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

中图分类号:TU375,TU317+. 1 文献标志码:A 文章编号:1002-848X(2022)05-0036-07

DOI:10. 19701 / j. jzjg. ZJ210013

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

LING Haimei, WANG Dayang, ZHOU Yun, LIANG Qiuhe, LI Junrui, DING Chao, KE Xiaobo

(College of Civil Engineering, Guangzhou University, Guangzhou 510006, China)

Abstract: Taking a 120m height super high-rise structure over subway as the research object, in view of the situation of notconsidering the pile foundation, considering the 15m resistance-reducing pile foundation and the 30m non-lateral frictionresistance pile foundation, three vibration control structural models of pileless foundation, 0. 5m and 1m pile foundation(TD, TE, TF model, respectively) were designed according to the 1 ∶30 shrinkage ratio. Shaking table tests were carriedout under 21 working conditions of 7 subway vibration waves, and the influence of pile length effect on the vibration controleffect of the vibration control layer of the upper cover structure and the vertical dynamic response of the upper floor werediscussed. The results show that after considering the pile foundation, the structure cycle is extended and the verticalfrequency is reduced. The main frequency distribution of the vibration control layer and the upper floor of different pilelength models is consistent, and the dynamic response of the upper cover structure decreases first and then increases alongthe height. The vibration control effect of the vibration control layer of the TE model is the best, and the vertical dynamicresponse of the upper floor of the TE model is close to that of the upper floor of the TD model, while the vertical dynamicresponse of the upper floor of the TF model shows an amplification trend. It is recommended that when using a similarvibration 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 atthe same time can reduce the impact of the pile foundation design on the operation of the tunnel and subway.

Keywords:building over subway; super high-rise structure; shaking table test; pile length effect; vertical vibrationresponse; vertical vibration control effect

∗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) .

第一作者:凌海媚,硕士研究生,主要从事结构减振控制研究,Email: 2111916024@ e. gzhu. edu. cn.

[引用本文] 凌海媚,汪大洋,周云,等. 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[ J] . 建筑结构,2022,52 ( 5) :36-42. LING Haimei,WANG Dayang,ZHOU Yun,et al. Study on vertical shakingtable model test of super high-rise structure over subway: vibration control model considering pile length [ J] . BuildingStructure,2022,52(5) :36-42.