基于推覆分析的輸入地震動加速度記錄核定準(zhǔn)則
扶長生 張小勇
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扶長生，張小勇(上海長福工程結(jié)構(gòu)設(shè)計事務(wù)所，上海 200011)［摘要］反應(yīng)譜理論的數(shù)學(xué)模型是平穩(wěn)高斯隨機(jī)過程，反應(yīng)譜法確定的線性地震反應(yīng)具有統(tǒng)計意義上平均的數(shù)學(xué)意義。推廣到非線性分析，推覆分析得到的目標(biāo)位移及層位移曲線等物理量同樣具有統(tǒng)計意義上平均地震反應(yīng)的數(shù)學(xué)意義。由于地面運(yùn)動的不可預(yù)測性及其動力非線性分析結(jié)果的離散性，對于標(biāo)準(zhǔn)設(shè)防類和重點(diǎn)設(shè)防類建筑物，筆者認(rèn)為核定1，2條使結(jié)構(gòu)非線性行為能滿足統(tǒng)計平均意義的地震動記錄作為輸入地震動是可以接受的。按此設(shè)防原理，提出應(yīng)用推覆分析的層位移或?qū)娱g位移曲線作為準(zhǔn)則來核定輸入地震動加速度記錄的理論，并成功地應(yīng)用于超限高層建筑的抗震性能評估中。［關(guān)鍵詞］反應(yīng)譜理論； 推覆分析； 統(tǒng)計意義上的平均； 輸入地震動加速度記錄核定中圖分類號：TU3982文獻(xiàn)標(biāo)識碼：A文章編號：1002848X(2012)11001108Push over based criteria for identifying input seismic accelerogramFu Changsheng, Zhang Xiaoyong(Shanghai ChinaFu Structural Design Inc., Shanghai 200011, China)Abstract: The spectral theory is based on Gauss stationary random process, and the linear seismic responses obtained by the spectral method are statistical mean values. As an extension to non linear analysis, it is consensus that the physical measures such as target displacement and story drift patterns along the height of a building determined by the Push over analysis are also the mean of the seismic responses in the statistical meaning. Owing to un prediction of the ground motion for specific site and dispersion of the results by dynamic non linear analysis, it may be reasonable that identification of one or two accelerograms of ground motion from the carefully selected set of seismic records as the system input, which will enable the non linear behaviour of the structure to meet the requirement of statistical mean value. Following such design philosophy, authors present the Pushover based identifying seismic wave theory, upon which the input seismic waves for dynamic nonlinear analysis of seismic categories B or C buildings are identified by using the displacement or story drift pattern obtained by Push over analysis. As an example, the seismic performance of an irregular tall building was successfully estimated by using the identification criteria presented here.Keywords: spectral theory; Push over analysis; statistical mean; input seismic accelerogram identification作者簡介：扶長生，教授級高級工程師，Email：cfstruct@vip.sina.com。參考文獻(xiàn)［1］ 王亞勇, 劉小第, 程明憲. 建筑結(jié)構(gòu)時程分析法輸入地震波的研究［J］. 建筑結(jié)構(gòu)學(xué)報, 1991, 12(2): 5160.［2］ 謝禮立, 馬玉宏, 翟長海. 基于性態(tài)的抗震設(shè)防與設(shè)計地震動［M］. 北京: 科學(xué)出版社, 2009.［3］ ATC 306. Tentative provisions for the development of seismic regulations for buildings［S］. Applied Technology Council, 1978.［4］ 扶長生, 張小勇. 推覆分析的原理和實(shí)施［J］. 建筑結(jié)構(gòu), 2012, 42(11): 110.［5］ FAJFAR P. Capacity spectrum method based on inelastic demand spectra［J］. Earthquake Engineering and Structural Dynamics, 1999, 28: 979993.［6］ FEMA 440. Improvement of nonlinear static seismic analysis procedures［S］. Federal Emergency Management Agency, 2005.［7］ 扶長生, 張小勇, 鞠進(jìn), 等. 高層建筑合理性能目標(biāo)的選取和實(shí)現(xiàn)［J］. 建筑結(jié)構(gòu), 2011, 41(S1): 18.［8］ ASCE/SEI 4106. Seismic rehabilitation of existing buildings ［S］. American Society of Civil Engineers, 2007.［9］ JAN T S, LIU M W， KAO Y C. An upperbound pushover analysis procedure for estimating the seismic demands of highrise buildings［J］. Engineering Structure, 2004, 26: 117128.
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