(广州大学土木工程学院, 广州 510006)

摘要: 以广州某地铁上盖 120m 高超高层结构为研究对象,通过振动台模型试验测试和其有限元分析,系统对比分析了试验和有限元分析的加速度响应、竖向频谱响应和振动控制效果,探讨了频率相似常数输入差异的对竖向振动传播规律的影响. 结果表明:振动台试验测试结果和有限元分析结果具有很好的吻合度,模型的竖向加速度沿楼层高度方向表现出放大的传播规律;非振动控制和振动控制模型在竖向第一阶频率处都出现了竖向共振放大响应,振动控制模型通过降低结构竖向第一阶频率和改变结构竖向动力特性,可有效减小地铁振动波核心频段 40 ~70Hz 范围的竖向振动,能减小上部结构约 30%的竖向加速度响应,且呈现楼层越高减振效果越明显的趋势. 振动台试验测试结果较按频率相似常数输入的有限元模型计算结果偏大,试验结果不会低估结构竖向振动响应,基于实测地铁振动波输入的振动台试验测试结果能反映结构竖向振动传播规律.

关键词: 地铁上盖建筑; 超高层结构; 竖向振动; 振动台试验; 有限元分析

中图分类号:TU375,TU317+. 1,TU352. 1 文献标志码:A 文章编号:1002-848X(2022)05-0022-07

DOI:10. 19701 / j. jzjg. ZJ210015

Study on vertical shaking table model test of super high-rise structure over subway:comparison and verification of test results and numerical calculation

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

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

Abstract: Taking a 120m height super high-rise structure over the subway in Guangzhou as the research object, through theshaking table model test and its finite element analysis, the acceleration response, vertical spectrum response and vibrationcontrol effect of the test and finite element analysis were systematically compared and analyzed, and the influence offrequency similarity constant input difference on vertical vibration propagation law was discussed. The results show that thetest results and finite element analysis results of the vibration table have a good fit, the vertical acceleration of the modelshows an enlarged propagation law along the floor height. The non vibration control model and the vibration control modelhave the vertical resonance amplification response at the vertical first-order frequency. By reducing the vertical first-orderfrequency of the structure and changing the vertical dynamic characteristics of the structure, the vibration control model caneffectively reduce the vertical vibration of the subway vibration wave core frequency range of 40 ~ 70Hz, and can reduce thevertical acceleration response of the superstructure by about 30%, and the higher the floor, the more obvious the vibrationreduction effect is. The test results of the shaking table test are larger than those of the finite element model based on thefrequency similarity constant. The test results do not underestimate the vertical vibration response of the structure. The testresults of the shaking table test based on the measured subway wave input can reflect the vertical vibration propagation lawof the structure.

Keywords:building over subway; super high-rise structure; vertical vibration; shaking table test; finite element analysis

∗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:梁秋河,博士研究生,主要从事结构振动控制研究,Email: 1475462366@ qq. com.

[引用本文] 梁秋河,汪大洋,周云,等. 地铁上盖超高层结构竖向振动台模型试验———试验结果与数值计算对比验证研究 [ J] . 建 筑 结 构, 2022, 52 ( 5) : 22-28. LIANG Qiuhe, WANG Dayang, ZHOU Yun, et al. Study on verticalshaking table model test of super high-rise structure over subway: comparison and verification of test results and numericalcalculation[ J] . Building Structure,2022,52(5) :22-28.