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(廣州大學(xué)土木工程學(xué)院, 廣州 510006)

摘要: 以廣州某地鐵上蓋 120m 高超高層結(jié)構(gòu)為研究對(duì)象,通過(guò)振動(dòng)臺(tái)模型試驗(yàn)測(cè)試和其有限元分析,系統(tǒng)對(duì)比分析了試驗(yàn)和有限元分析的加速度響應(yīng)、豎向頻譜響應(yīng)和振動(dòng)控制效果,探討了頻率相似常數(shù)輸入差異的對(duì)豎向振動(dòng)傳播規(guī)律的影響. 結(jié)果表明:振動(dòng)臺(tái)試驗(yàn)測(cè)試結(jié)果和有限元分析結(jié)果具有很好的吻合度,模型的豎向加速度沿樓層高度方向表現(xiàn)出放大的傳播規(guī)律;非振動(dòng)控制和振動(dòng)控制模型在豎向第一階頻率處都出現(xiàn)了豎向共振放大響應(yīng),振動(dòng)控制模型通過(guò)降低結(jié)構(gòu)豎向第一階頻率和改變結(jié)構(gòu)豎向動(dòng)力特性,可有效減小地鐵振動(dòng)波核心頻段 40 ~70Hz 范圍的豎向振動(dòng),能減小上部結(jié)構(gòu)約 30%的豎向加速度響應(yīng),且呈現(xiàn)樓層越高減振效果越明顯的趨勢(shì). 振動(dòng)臺(tái)試驗(yàn)測(cè)試結(jié)果較按頻率相似常數(shù)輸入的有限元模型計(jì)算結(jié)果偏大,試驗(yàn)結(jié)果不會(huì)低估結(jié)構(gòu)豎向振動(dòng)響應(yīng),基于實(shí)測(cè)地鐵振動(dòng)波輸入的振動(dòng)臺(tái)試驗(yàn)測(cè)試結(jié)果能反映結(jié)構(gòu)豎向振動(dòng)傳播規(guī)律.

關(guān)鍵詞: 地鐵上蓋建筑; 超高層結(jié)構(gòu); 豎向振動(dòng); 振動(dòng)臺(tái)試驗(yàn); 有限元分析

中圖分類號(hào):TU375,TU317+. 1,TU352. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗廣州市科技計(jì)劃項(xiàng)目(202032866、202102010459) ,廣東省科技創(chuàng)新戰(zhàn)略專項(xiàng)資金( pdjh2020a0452) .

第一作者:梁秋河,博士研究生,主要從事結(jié)構(gòu)振動(dòng)控制研究,Email: 1475462366@ qq. com.

[引用本文] 梁秋河,汪大洋,周云,等. 地鐵上蓋超高層結(jié)構(gòu)豎向振動(dòng)臺(tái)模型試驗(yàn)———試驗(yàn)結(jié)果與數(shù)值計(jì)算對(duì)比驗(yàn)證研究 [ J] . 建 筑 結(jié) 構(gòu), 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.