蔓延火災(zāi)下混凝土框架連續(xù)倒塌數(shù)值分析
發(fā)布時間:2018-12-13 20:21
【摘要】:為分析和模擬多層混凝土框架結(jié)構(gòu)在蔓延火災(zāi)下的反應(yīng)規(guī)律及其破壞過程,基于纖維梁模型和樓板簡化建模方法,建立了一個8層鋼筋混凝土框架整體結(jié)構(gòu)數(shù)值模型,分析對比了最不利位置處發(fā)生靜止火災(zāi)和蔓延火災(zāi)時整體結(jié)構(gòu)的力學響應(yīng)。模擬結(jié)果表明,不論是靜止還是蔓延火災(zāi)作用,結(jié)構(gòu)短邊受火工況均由于結(jié)構(gòu)內(nèi)力重分布能力不足發(fā)生了局部倒塌,而長邊工況由于荷載傳力路徑較多,并未引發(fā)倒塌。相比于靜止火災(zāi),蔓延火災(zāi)作用時受火構(gòu)件內(nèi)力重分布次數(shù)增多,延長了整體結(jié)構(gòu)的耐火極限時間。
[Abstract]:In order to analyze and simulate the response law and failure process of multi-story concrete frame structure under the spread of fire, a numerical model of 8-story reinforced concrete frame structure is established based on the fiber beam model and the simplified modeling method of floor slab. The mechanical response of the whole structure is analyzed and compared when the fire occurs at the most unfavorable position. The simulation results show that both static and spreading fire, the short edge of the structure is subjected to fire due to the lack of internal force redistribution capacity of the local collapse, but the long side of the load due to more load transfer path, did not cause collapse. Compared with the rest fire, the internal force redistribution times of the fire affected by the spreading fire increased, and the fire resistance limit time of the whole structure was prolonged.
【作者單位】: 北京工業(yè)大學建筑與工程學院;清華大學土木水利學院;
【基金】:國家自然科學基金項目(51578018) 國家重點研發(fā)計劃項目(2016YFC0701400)
【分類號】:TU375.4
[Abstract]:In order to analyze and simulate the response law and failure process of multi-story concrete frame structure under the spread of fire, a numerical model of 8-story reinforced concrete frame structure is established based on the fiber beam model and the simplified modeling method of floor slab. The mechanical response of the whole structure is analyzed and compared when the fire occurs at the most unfavorable position. The simulation results show that both static and spreading fire, the short edge of the structure is subjected to fire due to the lack of internal force redistribution capacity of the local collapse, but the long side of the load due to more load transfer path, did not cause collapse. Compared with the rest fire, the internal force redistribution times of the fire affected by the spreading fire increased, and the fire resistance limit time of the whole structure was prolonged.
【作者單位】: 北京工業(yè)大學建筑與工程學院;清華大學土木水利學院;
【基金】:國家自然科學基金項目(51578018) 國家重點研發(fā)計劃項目(2016YFC0701400)
【分類號】:TU375.4
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