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［摘要］結(jié)合汶川地震中樓梯間的震害表現(xiàn)，根據(jù)樓梯的數(shù)量與布置方式以及主結(jié)構(gòu)規(guī)模與布局構(gòu)建了18個(gè)計(jì)算模型，對(duì)鋼筋混凝土框架結(jié)構(gòu)中樓梯構(gòu)件的影響效果進(jìn)行分析研究。結(jié)果表明：樓梯構(gòu)件參與結(jié)構(gòu)整體計(jì)算分析后，鋼筋混凝土框架結(jié)構(gòu)的側(cè)向剛度、周期、振型、地震作用、層間位移、框架梁柱的地震內(nèi)力等技術(shù)指標(biāo)均有明顯的變化，這種變化與樓梯構(gòu)件的數(shù)量與布置方式以及主體結(jié)構(gòu)的側(cè)向剛度大小等因素密切相關(guān)。計(jì)算分析還表明，樓梯相關(guān)構(gòu)件（斜板、平臺(tái)梁、平臺(tái)柱等）在地震作用下的受力非常復(fù)雜，結(jié)構(gòu)設(shè)計(jì)時(shí)應(yīng)對(duì)此有充分的考慮。
［關(guān)鍵詞］汶川地震；框架結(jié)構(gòu)；樓梯構(gòu)件；影響效果；抗震設(shè)計(jì) 
中圖分類號(hào)： TU375.4 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)11-0088-06
Analysis on action effects of stairs in RC frame structures under earthquake
Luo Kaihai, Wang Yayong, Zuo Qiong(CABR Technology Co., Ltd., China Academy of Building Research, Beijing 100013, China)
Abstract: Combined with the damage of stairs during the Wenchuan Earthquake, the 18 structural analysis models were made up, according to the quantity and distribution manner of stairs and the lateral stiffness of main structures, to study the action effects of stairs in RC frame structures. The analysis results indicate that, when the stairs are considered in the whole structural analysis model, there are some evident changes in the technical indexes of RC frame structures, such as lateral stiffness, period, mode, earthquake action, interstory drift, seismic internal forces of structural elements, and so on. Furthermore, there are well correlations between those changes and the factors such as the quantity and distribution manner of stairs, the lateral stiffness of main structures, and so on. The analyses also show that the elements of stairs, such as the slope slabs, the flat beams and the flat columns, are in very complex states under seismic ground motions, so the seismic behaviors of stairs should be considered correctively in the phase of structural design.
Keywords: Wenchuan Earthquake; frame structure; stairs; action effect; seismic design
*“十一五”國(guó)家科技支撐計(jì)劃項(xiàng)目（2009BAJ28B03）。
作者簡(jiǎn)介：羅開(kāi)海(1973-),男，博士，副研究員，研究方向：工程抗震，Email：kailuo@263.net。
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