豎向基礎隔振模型建筑在地鐵激勵下的振動響應研究*
李江寧1，張暉2，虞煒2
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李江寧1，張暉2，虞煒2（1 同濟大學結(jié)構(gòu)工程與防災研究所， 上海 200092； 2 上海建筑設計研究院有限公司， 上海200041）［摘要］為研究采用豎向基礎隔振技術(shù)的建筑在地鐵激勵下的響應，在上海地鐵某線路隧道正上方制作了一個兩層磚混結(jié)構(gòu)房屋模型，采用橡膠支座與疊層橡膠滑板支座并聯(lián)作為隔振層。建立了該房屋模型的有限元模型，通過不同型號和不同數(shù)量隔振支座的組合來改變隔振頻率，以不同隔振工況下的實測基底振動加速度記錄為輸入激勵，計算了結(jié)構(gòu)在時域內(nèi)的響應。將結(jié)構(gòu)的時域響應轉(zhuǎn)換為振動加速度級，評價了不同隔振頻率的隔振效果，并與實測結(jié)果進行了比較。研究表明，建立的有限元模型能夠較真實地反映地鐵激勵下基礎隔振建筑物的振動響應，能夠?qū)Φ罔F激勵下擬建建筑的振動進行預測，為其隔振設計提供理論依據(jù)。［關(guān)鍵詞］地鐵振動； 基礎隔振； 有限元模型； 振動加速度級中圖分類號：TU352.1, TU317+.1 文獻標識碼：A 文章編號：1002-848X(2013)13-0027-04Study on subway-induced vibration response of vertical base isolated model buildingLi Jiangning1, Zhang Hui2, Yu Wei2(1 Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China; 2 Shanghai Institute of Architectural Design & Research Co., Ltd., Shanghai 200041, China)Abstract: To study the subway-induced vibration response of vertical base isolated structure, a two-story masonry model structure, equipped with rubber bearings and laminated rubber sliding bearings, was built above a subway tunnel in Shanghai. Finite element model of the structure was established. Different vibration isolation frequencies were obtained by using different types and different numbers of bearings. Time-domain vibration acceleration response of the model structure was obtained by the dynamic elastic finite element calculation of the model with the input acceleration which can be conveniently measured on the site ground. The vibration isolation performance was evaluated by converting the time-domain vibration acceleration response into vibration acceleration level. Calculated results were compared with the measurement results. Results show that the established finite element model can properly reflect the actual subway-induced building vibration and provide a basis for subway-induced vibration isolation design of buildings.Keywords: Subway-induced vibration; base isolation; finite element model; vibration acceleration level*上海市科學技術(shù)委員會科研項目（09dz1207800），上海市城鄉(xiāng)建設和交通委員會科研項目（重科2010-002）。作者簡介：李江寧，碩士，Email: 1130568@#edu.cn。參考文獻［1］BALENDRA T, CHUA H, LO K W, et al. Steady-state vibration of subway-soil-building system［J］. Journal of Engineering Mechanics, 1989,115(1):145-162.［2］洪俊青, 劉偉慶. 地鐵對周邊建筑物振動影響分析［J］.振動與沖擊, 2006,25(4):142-145.［3］張暉，盛濤. 地鐵運行誘發(fā)建筑物振動的豎向基礎隔振現(xiàn)場模型試驗分析［J］.建筑結(jié)構(gòu)，2013，43（13）：22-26.［4］LAI CARLO G, CALLERIO ALBERTO, FACCIO LIEZIO, et al. Prediction of railway-induced ground vibrations in tunnels［J］. Journal of Vibration and Acoustics, 2005, 127: 503-514.［5］王勖成,邵敏.有限單元法基本原理和數(shù)值方法［M］.北京:清華大學出版社,1997.［6］王田友, 丁潔民, 樓夢麟.關(guān)于軌道交通所致建筑振動的計算方法和阻尼矩陣的討論［J］.振動與沖擊,2008,27(11):77-79.［7］王田友. 地鐵運行所致環(huán)境振動及建筑物隔振方法研究［D］.上海：同濟大學,2008.［8］GB/T 50355—2005住宅建筑室內(nèi)振動限值及其測量方法標準［S］.北京:中國建筑工業(yè)出版社,2005.［9］李守繼，樓夢麟，丁潔民，等. 地鐵環(huán)境中房屋浮置地板隔振分析［J］.結(jié)構(gòu)工程師，2007,23(5)：10-14.［10］DEGRANDE G, CLOUTEAU D, OTHMAN R, et al. Anumerical model for ground-borne vibrations from underground railway traffic based on a periodic finite element-boundary element formulation［J］.Journal of Sound and Vibration, 2006, 293(3-5): 645-666.
