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       時(shí)旭東  過(guò)鎮(zhèn)海
    （清華大學(xué)土木系  北京 100084）

[提要]  通過(guò)對(duì)6根鋼筋砼兩跨連續(xù)梁進(jìn)行高溫試驗(yàn)，分析了連續(xù)梁的破壞特征、機(jī)構(gòu)以及內(nèi)力重分布情況。結(jié)果表明，在升溫過(guò)程中，不但連續(xù)梁內(nèi)力要發(fā)生劇烈的重分布，而且可能改變其破壞機(jī)構(gòu)，與常溫下具有顯著的差異，塑性鉸是一個(gè)可變鉸。
[關(guān)鍵詞]  高溫 破壞機(jī)構(gòu)  內(nèi)力重分布 鋼筋砼連續(xù)梁

The behaviors of reinforced concrete continuous beams of two spans are investigated at elevated temperature. From the test results of six specimens, the failure modes, mechanism and internal force redistribution of the continuous beams are analysed. It is shown that the internal forces of the continuous beams are rapidly and considerably redistributed at elevated temperature. And, the failure mechanism of the specimens differs from that at the room temperature. It is also concluded that the ultimate strengths of the plasticity hinges vary as the temperature elevated.
Keywords: high temperature; failure mechanism; internal force redistribution; reinforced concrete continuous beam