蔓延火灾下混凝土框架连续倒塌数值分析
发布时间：2018-12-13 20:21
【摘要】：为分析和模拟多层混凝土框架结构在蔓延火灾下的反应规律及其破坏过程,基于纤维梁模型和楼板简化建模方法,建立了一个8层钢筋混凝土框架整体结构数值模型,分析对比了最不利位置处发生静止火灾和蔓延火灾时整体结构的力学响应。模拟结果表明,不论是静止还是蔓延火灾作用,结构短边受火工况均由于结构内力重分布能力不足发生了局部倒塌,而长边工况由于荷载传力路径较多,并未引发倒塌。相比于静止火灾,蔓延火灾作用时受火构件内力重分布次数增多,延长了整体结构的耐火极限时间。
[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.
【作者单位】： 北京工业大学建筑与工程学院;清华大学土木水利学院;
【基金】：国家自然科学基金项目(51578018) 国家重点研发计划项目(2016YFC0701400)
【分类号】：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.
【作者单位】： 北京工业大学建筑与工程学院;清华大学土木水利学院;
【基金】：国家自然科学基金项目(51578018) 国家重点研发计划项目(2016YFC0701400)
【分类号】：TU375.4
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