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    周向明  李國(guó)強(qiáng)  丁  翔
    （同濟(jì)大學(xué)建筑工程系  上海 200092）

[提要]  將高層鋼-混凝土混合結(jié)構(gòu)分為外部鋼框架和內(nèi)部混凝土核心筒兩部分。外部鋼框架進(jìn)一步簡(jiǎn)化為半剛架和相應(yīng)的彈性階梯形等效彎曲桿的串聯(lián)體系，這種簡(jiǎn)化模型能考慮柱軸向變形對(duì)結(jié)構(gòu)動(dòng)力反應(yīng)的影響；內(nèi)部混凝土核心筒則采用彎剪兩彈簧墻單元模型，簡(jiǎn)化后的框架和混凝土芯筒之間通過(guò)位于樓面標(biāo)高處的水平剛性連桿連接?？紤]到幾何非線性對(duì)高層結(jié)構(gòu)動(dòng)力反應(yīng)的影響，再用一豎向受載桿與上述簡(jiǎn)化結(jié)構(gòu)并聯(lián)，從而得到了高層混合結(jié)構(gòu)簡(jiǎn)化動(dòng)力分析模型。對(duì)。個(gè)25層混合結(jié)構(gòu)的1/20試驗(yàn)?zāi)Ｐ瓦M(jìn)行了理論分析，并與模擬地震振動(dòng)臺(tái)試驗(yàn)結(jié)果進(jìn)行對(duì)比。分析表明，提出的簡(jiǎn)化模型能反映混合結(jié)構(gòu)主要的動(dòng)力特征，可大大減少計(jì)算自由度和降低計(jì)算工作量，且具有較好的計(jì)算精度。
[關(guān)鍵詞]  鋼框架  核心筒  混合結(jié)構(gòu)  彈塑性  地震反應(yīng)分析  半剛架模型  彎剪兩彈簧墻單元模型

The modeling of hybrid structures comprising external steel frames and core concrete tube is simplified for nonlinear seismic analysis. The external steel frames are simplified as a series of half frames and the core-tube is modeled as a bending and shearing two-spring system. The two parts mentioned above are connected with horizontal rigid bars at the level of the floors. To verify the effectiveness and reliability of the proposed simplified model for analysis of elasto-plastic response of hybrid structures subjected to earthquakes, shaking table tests were conducted on a small-scale model of 25-story hybrid structure building. Comparing with the data obtained from the shaking table test, it is found that the theoretical analysis by employing the proposed analytical model can predict the response of the moclel building with satisfactory precision.
Keywords:  hybrid structures; tall building; elasto-plastic analysis; seismic response