地鐵運(yùn)行誘發(fā)建筑物振動(dòng)的豎向基礎(chǔ)隔振現(xiàn)場(chǎng)模型試驗(yàn)分析*
張暉1,盛濤2
- 摘 要
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張暉1,盛濤2(1 上海建筑設(shè)計(jì)研究院有限公司, 上海 200041; 2 同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所, 上海 200092)[摘要]地鐵運(yùn)行誘發(fā)建筑物的振動(dòng)以豎向振動(dòng)為主,而現(xiàn)階段關(guān)于降低此類(lèi)振動(dòng)的基礎(chǔ)隔振技術(shù)研究較少。在上海地鐵某線路隧道上方制作了一個(gè)兩層磚混結(jié)構(gòu)的房屋模型,采用橡膠支座和疊層橡膠滑板支座并聯(lián)作為隔振層。通過(guò)不同型號(hào)和不同數(shù)量隔振支座的組合來(lái)改變隔振頻率。在對(duì)基礎(chǔ)固定和不同隔振頻率下模型的基礎(chǔ)、一層及二層樓板的加速度現(xiàn)場(chǎng)實(shí)測(cè)的基礎(chǔ)上,對(duì)比分析了模型的峰值加速度響應(yīng)和峰值隔振率,研究了模型豎向振動(dòng)的主要頻率成分及其變化規(guī)律,從1/3倍頻程分頻振級(jí)的角度評(píng)價(jià)了不同隔振頻率的隔振效果。研究結(jié)果表明,在適當(dāng)?shù)母粽耦l率下,地鐵引發(fā)結(jié)構(gòu)的豎向振動(dòng)可以控制在滿(mǎn)意的范圍內(nèi),但過(guò)低的隔振頻率會(huì)放大結(jié)構(gòu)的低頻振動(dòng),應(yīng)加以注意。[關(guān)鍵詞]地鐵振動(dòng); 豎向隔振; 現(xiàn)場(chǎng)模型試驗(yàn); 1/3倍頻程分頻振級(jí)中圖分類(lèi)號(hào):TU352.1,TU317+.1 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1002-848X(2013)13-0022-05Site model test analysis on vertical base isolation under subway-induced building vibrationsZhang Hui1, Sheng Tao2(1 Shanghai Institute of Architectural Design & Research Co., Ltd., Shanghai 200041, China; 2 Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China)Abstract: Subway-induced vibration is basically vertical vibration, which is rarely studied in the field of vertical base isolation. A two-story masonry model structure, which was built above a subway tunnel in Shanghai, was equipped with rubber bearings and laminated rubber sliding bearings. Different vibration isolation frequencies were obtained by using different types and different numbers of bearings. According to the vibration test data of the basement, the first floor and the second floor of the model under fixed base and different isolation frequency cases, the peak acceleration and isolation rate were compared, the main frequency components and their varying pattern were analyzed, and the vibration isolation performance was appraised in view of the 1/3 octave frequency vibration level. Results show that the subway-induced structural vertical vibration can be controlled effectively under certain isolation frequency, but it should be noticed that low isolation frequency will amplify low frequency vibration of the structure.Keywords: Subway-induced vibration; vertical vibration isolation; site model test; 1/3 octave frequency vibration level*上海市科學(xué)技術(shù)委員會(huì)科研項(xiàng)目(09dz1207800),上海市城鄉(xiāng)建設(shè)和交通委員會(huì)科研項(xiàng)目(重科2010-002)。作者簡(jiǎn)介:張暉,博士,高級(jí)工程師,一級(jí)注冊(cè)結(jié)構(gòu)工程師,Email:zhanghui@siadr.com.cn。參考文獻(xiàn)[1]唐家祥,劉再華. 建筑結(jié)構(gòu)基礎(chǔ)隔震[M].武漢:華中理工大學(xué)出版社,1993:495-503.[2]樓夢(mèng)麟,賈寶印,陸秀麗,等. 地鐵振動(dòng)下基礎(chǔ)隔振效應(yīng)的實(shí)測(cè)與分析[J].同濟(jì)大學(xué)學(xué)報(bào):自然科學(xué)版,2011,39(11):1622-1628.[3]樓夢(mèng)麟,賈旭鵬,俞潔勤.地鐵運(yùn)行引起地面的振動(dòng)實(shí)測(cè)及傳播規(guī)律分析[J].防災(zāi)減災(zāi)工程學(xué)報(bào),2009,29(3):282-288.[4]樓夢(mèng)麟,李守繼. 地鐵引起建筑物振動(dòng)評(píng)價(jià)研究[J].振動(dòng)與沖擊,2007,26(8):68-71.[5]CHOPRA A K. Dynamics of structures: theory and applications to earthquake with emphasis on earthquake engineering[M]. Berkley: Computers and Structures Inc., 2004.[6]李亞明,施衛(wèi)星. 一種組合隔振(震)支座力學(xué)性能試驗(yàn)研究[J]. 建筑結(jié)構(gòu),2013,43(13):17-21.[7]王田友,丁潔民,樓夢(mèng)麟,等. 地鐵運(yùn)行所致建筑物振動(dòng)的傳播規(guī)律分析[J]. 土木工程學(xué)報(bào),2009,42(5):33-39.[8]JGJ/T 170—2009 城市軌道交通引起建筑物振動(dòng)與二次輻射噪聲限值及其測(cè)量方法標(biāo)準(zhǔn) [S]. 北京:中國(guó)建筑工業(yè)出版社,2009.
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