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     田  穎  錢稼茹  劉鳳閣
    （清華大學(xué)  北京 100084）

[提要]  根據(jù)能力譜方法的基本原理，建立了在用RC框架結(jié)構(gòu)基于位移抗震性能的評(píng)估方法。該方法采用了振型分解法建立的多自由度體系和等效單自由度體系之間的轉(zhuǎn)換關(guān)系，以及由現(xiàn)行《建筑抗震設(shè)計(jì)規(guī)范》的反應(yīng)譜曲線建立的結(jié)構(gòu)抗震要求曲線。用本文方法對(duì)清華大學(xué)主樓10層鋼筋混凝土框架結(jié)構(gòu)進(jìn)行了抗震性能評(píng)估，同時(shí)進(jìn)行了小震和大震作用下的彈塑性時(shí)程分析。本文方法得到的頂點(diǎn)位移角、層間位移角和塑性鉸分布與時(shí)程分析的結(jié)果比較符合。
[關(guān)鍵詞]  鋼筋混凝土  框架結(jié)構(gòu)  位移  抗震性能評(píng)估  能力譜法

By means of basic principle of capacity spectrum method, the displacement-based seismic capacity evaluation method for existing reinforced concrete( RC) frame structures is established.  Basic features of the method are non-linear static analysis (i.e.,push-over analysis), transformation between multi-degree of freedom system( MDOF) and single-degree of freedom system( SDOF), and seismic demand curve in the form of acceleration-displacement spectrum. The relationship between MDOF and SDOF is established by mode analysis and the seismic demand curve according to the response spectrum given in the current Seisn2ic Design Code for Buildings. Seismic performance of l0-story main building of Tsinghua University is evaluated by the developed capacity spectrum method. The results, such as the top displacement, the story drift and the plastic hinge distribution under the minor earthquake and the rare earthquake are verified by non-linear time history analysis.
Keywords: existing reinforced concrete frame structure; displacement-based seismic behavior evaluation; capacity spectrum method