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Study on the collapse process of the complex structure of the high-rise building under fire

DOI：

 作者 单位 E-mail 崔铁军 辽宁工程技术大学 ctj.159@163.com

为了探究具有多核心筒和中空结构的复杂高层建筑受火灾后的坍塌特征，采用颗粒流方法对建筑建模并实施火灾模拟。建筑为中空-四核心筒-框架结构，根据其特点设置了两种火场方案，包括单侧火场和双侧火场，模拟温度为1000℃、1200℃、1400℃、1600℃。模拟上述情况下该建筑坍塌过程、分析其坍塌特点和时间。总结坍塌现象得到如下结论：该类建筑在一侧受火灾作用坍塌情况下，较结构简单高层建筑更易出现坐塌破坏，有利于坍塌范围控制。主要坐塌位置为两处，31m高变阶位置和火区上部。前期坍塌由于火灾，后期由于底部结构破坏而失稳坐塌。双侧火区与单侧相比，出现明显坍塌时间较快，因火灾坍塌的阶段时间较短，后期失稳坐塌时间较长。

In order to explore the collapse characteristics of a more core tube and hollow structure of the complex high-rise building under fire, the building is model with particle flow and fire simulation is implemented. The building is hollow - four core barrel - frame structure. According to its characteristic, two kinds of fire plan are designed, including one side fire and both side fire, for the simulated temperature 1000℃、1200℃、1400℃、1600℃. Under above situation, the collapse of the building process is simulated, and analyzes its characteristics and collapse time. Summarizes the collapse phenomenon get the following conclusion: the class building in a side fire collapse cases, relatively simple structure high-rise buildings are more likely to sitting collapse destroyed, is advantageous to the collapse range control. There are two main sitting collapse position, 31 m high order position and upper fire area. Early collapse is due to fire; later sitting collapse is due to the bottom of the structure damage and instability. Compared with one side fire, two side fire area apparent collapse time quickly; For fire collapse stage time is shorter; Late instability sitting collapse is a long time.
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