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（1 南京長江都市建筑設(shè)計股份有限公司， 南京 210006； 2 南京工業(yè)大學(xué)土木工程學(xué)院， 南京 211816）
［摘要］基于基礎(chǔ)阻抗與黏彈性阻尼器頻率相關(guān)的動力特性，在頻域中建立了考慮土-結(jié)構(gòu)動力相互作用的黏彈性框架減震結(jié)構(gòu)的動力模型, 采用隨機振動理論對結(jié)構(gòu)體系進行抗震研究?？紤]地基-土體運動相互作用對輸入地震動的影響，對自由場地功率譜進行修正得到了基礎(chǔ)底部水平有效輸入功率譜和回轉(zhuǎn)有效輸入功率譜。以結(jié)構(gòu)層間位移角作為控制參數(shù)，基于首次穿越原則，定義了結(jié)構(gòu)的失效概率。根據(jù)工程實例選取了10層及20層典型框架結(jié)構(gòu)體系，數(shù)值分析了結(jié)構(gòu)在不同初始附加阻尼比、基礎(chǔ)埋深比及土體剪切波速下的隨機地震反應(yīng)及其失效概率。研究表明，隨著土體的變軟，阻尼器對結(jié)構(gòu)層間位移角的控制效果將有所減弱，對于高寬比較大的20層結(jié)構(gòu)，其控制效果的下降幅度更為明顯。對于軟土地基上高層建筑的消能減震設(shè)計，SSI效應(yīng)的影響不容忽視。
［關(guān)鍵詞］黏彈性阻尼器； 土-結(jié)構(gòu)相互作用； 附加阻尼比； 位移角； 失效概率
中圖分類號：TU352-1， TU973-31文獻標(biāo)識碼：A文章編號：1002-848X(2020)01-0112-06
Parametric study on failure probability of structures with viscoelastic dampers considering SSI effect
Zhao Xuefei1, Jiang Han1, Wang Shuguang2
(1 Nanjing Yangtze River City Architectural Design Co., Ltd., Nanjing 210006, China；2 College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China)
Abstract:Based on the dynamic characteristics of the foundation impedance and the frequency of the viscoelastic dampers, the dynamic model of the viscoelastic frame damping structure considering soil-structure interaction (SSI) was established in the frequency domain, and the seismic behavior of the structural system was studied by using random vibration theory. Considering the influence of foundation-soil interaction on the input ground motion, the effective input power spectrum at the bottom of the foundation and the effective input power spectrum at the bottom of the foundation were obtained by modifying the power spectrum of the free site. Based on the principle of the first crossing, the failure probability of the structure was defined by taking the interlayer displacement angle as the control parameter. According to the engineering examples, 10-story and 20-story typical frame structure systems were selected, and the random seismic response and failure probability of the structures under different initial additional damping ratios, foundation buried depth ratios and shear wave velocities of the soil were analyzed. The results show that the control effect of the damper on the interlayer displacement angle is weakened with the softening of the soil. For the 20-story structure with large height width ratio, the decrease of the control effect is more obvious. For the energy-dissipated design of high-rise buildings on soft soil foundation, the influence of SSI effect can not be ignored.
Keywords:viscoelastic damper; soil-structure interaction; additional damping ratio; displacement angle; failure probability
作者簡介：趙學(xué)斐，博士，工程師，Email:zhaoxuefeinjut@163.com。
