(广州大学土木工程学院, 广州 510006)

摘要: 基于某地铁上盖 120m 高超高层结构的工程背景,分别对无桩基础结构、15m 桩周降阻桩基础结构以及30m 无侧摩阻力桩基础结构,进行了 1 ∶30 缩尺振动台试验. 基于白噪声和 7 条地铁振动波不同峰值加速度激励下的结构响应,对比分析了三个振动台试验模型各测点楼层的振动响应. 结果表明:桩基长度的改变可明显改变上盖结构的动力特性,上盖结构 X、Y、Z 三向频率呈现随桩基长度增加而减小的变化趋势,且桩基越长上盖结构的频率越低. 相比于无桩基础结构,15m 桩周降阻基础结构在避免地铁隧道下沉风险的同时,有利于降低上盖结构的振动响应. 同时桩周降阻处理的桩基础改变了上盖结构的动力特性,使上盖结构楼层振动由高频向低频转移;而30m 无侧摩阻力桩基础,对降低上盖结构的振动响应有限,且不影响结构楼层的振动频率分布. 实际工程设计时,应综合竖向振动响应控制、地铁隧道沉降和桩基稳定性,合理设计桩周降阻长度.

关键词: 地铁上盖建筑; 地铁振动波激励; 超高层结构; 桩基长度; 桩周降阻; 振动台试验; 振动响应

中图分类号:TU375,TU317+. 1 文献标志码:A 文章编号:1002-848X(2022)05-0029-07

DOI: 10. 19701 / j. jzjg. ZJ210017

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

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

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

Abstract: Based on the actual engineering background of a 120m height super high-rise structure above subway,the 1 ∶30scale shaking table tests were carried out for structure without pile foundation, structure with 15m resistance-reducing pilefoundation and structure with 30m non-lateral friction resistance pile foundation respectively. According to the structuralresponses of white noise and 7 subway vibration waves excited by different peak accelerations, the vibration responses offloors at each measuring point of three vibration table structures were compared and analyzed. The results show that thechange of pile foundation length can significantly change the dynamic characteristics of the upper cover structure. Thethree-directional frequency of X, Y, and Z of the upper cover structure decreases with the increase of the pile foundationlength, and the longer the pile foundation, the lower the frequency of the upper cover structure. Compared with structurewithout pile foundation, structure with 15m resistance-reducing pile foundation is beneficial to reduce the vibration responseof the upper cover structure while avoiding the risk of subway tunnel sinking. At the same time, the pile foundation treatedwith resistance reduction around the pile changes the dynamic characteristics of the upper cover structure, which makes thefloor vibration of the upper cover structure transfer from high frequency to low frequency. The 30m non-lateral frictionresistance pile foundation has a limited response to reduce the vibration of the upper cover structure and does not affect thevibration frequency distribution of the structural floor. In actual engineering design, the control of vertical vibration effect,settlement of subway tunnel, and stability of pile foundation should be integrated to reasonably design theresistance-reducing length around the pile.

Keywords:building over subway; subway vibration wave excitation; super high-rise structure; pile foundation length;reduced resistance around the pile; shaking table test; vibration response

∗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:丁超,硕士研究生,主要从事结构减振控制研究,Email: 13893276245@ 163. com.

[引用本文] 丁超,汪大洋,周云,等. 地铁上盖超高层结构竖向振动台模型试验———考虑桩长的非振动控制模型研究[ J] . 建筑结构,2022,52(5) :29-35. DING Chao,WANG Dayang,ZHOU Yun,et al. Study on vertical shaking tablemodel test of super high-rise structure over subway: non vibration control model considering pile length [ J ] . BuildingStructure,2022,52(5) :29-35.