- 摘 要
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(同濟大學(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的反應(yīng)并與已有的試驗結(jié)果進行了驗證。進一步分析了梁的軸向約束、梁端轉(zhuǎn)動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用抗火設(shè)計方法,可供結(jié)構(gòu)抗火設(shè)計時參考。
【關(guān)鍵詞】 鋼結(jié)構(gòu) 約束鋼梁 抗火設(shè)計 懸鏈線效應(yīng)
Behavior of Restrained Steel Beams Subjected to Fire and Practical Fireresistant 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 fireresistant design method for restrained beam is presented.
Keywords:fireresistance;steel structure;catenary action;ultralarge deflection