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Study on the collapse process of the complex structure of the high-rise building under fire[J].计算力学学报,2018,35(5):656~662

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

DOI：10.7511/jslx20161112001

 作者 单位 E-mail 崔铁军 辽宁工程技术大学 安全科学与工程学院, 阜新 123000大连交通大学辽宁省隧道与地下结构工程技术研究中心, 大连 116028 ctj.159@163.com 李莎莎 辽宁工程技术大学 安全科学与工程学院, 阜新 123000 王来贵 辽宁工程技术大学 力学与工程学院, 阜新 123000 马云东 大连交通大学辽宁省隧道与地下结构工程技术研究中心, 大连 116028

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进行建模并实施火灾模拟。建筑为中空-四核心筒-框架结构，根据其特点设置了单侧火场和双侧火场两种方案，模拟温度为1000℃，1200℃，1400℃和1600℃。模拟上述情况下该建筑的坍塌过程，分析其坍塌特点和时间。总结坍塌现象发现，该类建筑在一侧受火灾作用坍塌情况下，较结构简单的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，31 m高变阶位置和火区上部；前期坍塌是由于火灾，后期是由于底部结构破坏而失稳坐塌；双侧火区与单侧相比，坍塌明显较快，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 multi-core tube hollow structure of a complex high-rise building under fire,fire simulation is implemented as particle flow.The building is a hollow four-core barrel frame structure.According to its characteristic,two kinds of fire plans are designed,including fire from one side and fire on both sides,at the simulated temperatures of 1000℃,1200℃,1400℃ and 1600℃.In the above situations,the collapse of the building process is simulated,and its characteristics and collapse time are analysed.The collapse phenomenon can be ummarised as follows:during the collapse of this kind of buildings in a side fire,relatively simple parts of the high-rise buildings are more likely to suffer from sitting collapse, which is advantageous to control the extent of destruction.There are two main locations of sitting collapse:31 m high order position and upper fire area.Early collapse is due to fire;later sitting collapse is due to the structure damage and instability of the bottom of the structure.Compared with one-sided fire,two-sided fire area leads to faster collapse;as a result,the fire collapse stage is shorter and subsequent instability in sitting collapse takes longer.