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(同濟(jì)大學(xué)土木工程學(xué)院  上海 200092)
【提要】采用有限元方法分析了火災(zāi)下約束鋼梁隨溫度升高時(shí)的反應(yīng)并與已有的試驗(yàn)結(jié)果進(jìn)行了驗(yàn)證。進(jìn)一步分析了梁的軸向約束、梁端轉(zhuǎn)動(dòng)約束以及荷載比對約束鋼梁受力性能的影響。總結(jié)了約束鋼梁在火災(zāi)下的變形及軸力的發(fā)展規(guī)律。最后提出了約束鋼梁的實(shí)用抗火設(shè)計(jì)方法，可供結(jié)構(gòu)抗火設(shè)計(jì)時(shí)參考。
【關(guān)鍵詞】  鋼結(jié)構(gòu)  約束鋼梁  抗火設(shè)計(jì)  懸鏈線效應(yīng)
Behavior of Restrained Steel Beams Subjected to Fire and Practical Fireresistant Design Method/Guo Shixiong,Li Guoqiang(Dept.of Structural Engineering,Tongji University,Shanghai 200092,China)
Abstract:The behaviour of restrained steel beams subjected to fire is analysed with FEM and verified by experimental results.The effects of axial restraint,rotational restraint and load ratio of the beam are discussed.The development of the deflection and axial force of the restrained beam subjected to increasing temperature is summarized and a practical fireresistant design method for restrained beam is presented.
Keywords:fireresistance;steel structure;catenary action;ultralarge deflection