| 崔 旺,秦洪悦,张建飞.火灾作用下钢筋混凝土基础隔震结构连续倒塌分析[J].水泥工程,2023,36(6):79-85 |
| 火灾作用下钢筋混凝土基础隔震结构连续倒塌分析 |
| Progressive collapse analysis of base isolated structures under fire |
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| DOI： |
| 中文关键词: 基础隔震结构,火灾,ABAQUS,连续倒塌 |
| 英文关键词: base isolated structure, fire,ABAQUS,progressive collapse |
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| 摘要点击次数: 63 |
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| 中文摘要: |
| 为了得到火灾发生后基础隔震结构倒塌性能, 先进行了铅芯橡胶隔震支座在高温下力学性能的研究。通过ABAQUS有限元软件，建立了铅芯橡胶隔震支座和基础隔震框架的有限元模型并进行热力耦合分析。分析了火灾高温下橡胶隔震支座竖向刚度变化规律以及基础隔震框架结构的倒塌机制、应力状态、变形规律和塑性铰分布规律。结果表明：铅芯橡胶隔震支座的竖向刚度随受火时间的增长而逐渐降低，受火75 min时完全失去承载力；基础隔震框架不同位置支座受火时，框架呈现不同的应力、变形状态；边支座和内部双支座受火时，框架发生连续倒塌。 |
| 英文摘要: |
| In order to obtain the collapse performance of base isolated structure after fire, the mechanical properties of lead rubber bearing at high temperature were studied. The finite element model of the lead rubber isolation bearing and the base isolation frame are established by ABAQUS finite element software, and the thermal mechanical coupling analysis is carried out. The vertical stiffness changes of rubber bearings under high temperature are analyzed, and the collapse mechanism, stress state, deformation law and plastic hinge distribution law of base isolated frame structures are analyzed. The results show that the vertical stiffness of the lead rubber bearing decreases gradually with the increase of the fire time, and the bearing capacity is completely lost when the fire 75 min;The frame presents different stress and deformation states when the different bearing of the base isolation frame is subjected to fire; The frame collapses continuously when the side support and the internal double support are subjected to fire. |
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