- 摘 要
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(1 蘭州理工大學(xué)甘肅省土木工程防災(zāi)減災(zāi)重點(diǎn)實驗室, 蘭州 730050; 2 蘭州理工大學(xué)防震減災(zāi)研究所, 蘭州 730050)
［摘要］由于長周期地震動記錄相對缺乏，國內(nèi)外對長周期地震動作用下高層結(jié)構(gòu)的地震響應(yīng)研究尚不充分。選取2008年汶川地震和2011年日本東北地震中長周期分量明顯的3組地震動記錄，首先對其絕對加速度放大系數(shù)譜和相對位移反應(yīng)譜的特性進(jìn)行研究；進(jìn)一步以某超限高層結(jié)構(gòu)為研究對象，同時以這3組地震動記錄為輸入，分別進(jìn)行了8度多遇地震作用下的彈性分析和罕遇地震作用下的彈塑性時程分析，提取了結(jié)構(gòu)的主要地震響應(yīng)指標(biāo)，并與相應(yīng)水準(zhǔn)El Centro地震動記錄輸入下的分析結(jié)果進(jìn)行了比較。對比結(jié)果表明，長周期地震動輸入下結(jié)構(gòu)的地震響應(yīng)指標(biāo)如水平最大位移和最大層間位移角明顯大于普通地震動記錄輸入下的響應(yīng)指標(biāo)，因此長周期地震動對超限高層結(jié)構(gòu)的影響應(yīng)引起足夠的重視。
［關(guān)鍵詞］長周期地震動; 超限高層; 時程分析; 地震響應(yīng); 汶川地震; 日本東北大地震
中圖分類號：TU352.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)18-0059-04
Seismic response analysis of an out-of-code high-rise building under long-period ground motion: case studies of Wenchuan Earthquake and Japan Tohoku Earthquake records
Han Jianping1,2, Su Yanbing1,2
(1 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China; 2 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China)
Abstract: Due to the lack of long-period ground motion records, the influence of long-period ground motion on seismic performance of high-rise buildings is not studied sufficiently. Three suites of ground motion records with obvious long-period components from 2008 Wenchuan Earthquake and 2011 Japan Tohoku Earthquake were selected. The characteristics of their absolute acceleration amplification factor spectra and relative displacement spectrum were discussed. Furthermore, an out-of-code high-rise building was taken as case study. These suites of ground motion records were taken as inputs to carry out elastic time-history analysis under the frequent earthquake and elastic-plastic time-history analysis under the rare earthquake of the seismic fortification intensity zone 8. Main seismic response indicators were obtained and also compared with the results under the corresponding El Centro ground motion input cases. Comparison of the results shows that seismic responses such as maximum horizontal displacement and maximum story drift under long-period ground motion are apparently higher than the seismic responses under normal ground motion, which indicates that enough attention should be paid on the influence of long-period ground motion on the seismic performance of out-of-code high-rise buildings.
Keywords: long-period ground motion; out-of-code high-rise building; time-history analysis; seismic response; Wenchuan Earthquake; Japan Tohoku Earthquake
*國家自然科學(xué)基金項目(51268036)。
作者簡介：韓建平，博士，教授，博士生導(dǎo)師，Email：jphan@lut.cn。
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