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工程力学  2014 

三肢钢管混凝土格构式柱耐火性能分析

, PP. 207-212

Keywords: 钢管混凝土,格构式柱,火灾,耐火性能,荷载比,升温时间比

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Abstract:

采用有限元法对三肢钢管混凝土格构式柱在ISO834标准升、降温火灾下的耐火性能进行了模拟。分析了该类构件在全过程火灾作用下达到极限状态时的破坏形态、轴向变形-时间关系曲线和各柱肢受力情况,并研究了升温时间比和荷载比对三肢钢管混凝土格构式柱是否在火灾降温阶段达到极限状态的影响规律。分析表明,三肢钢管混凝土格构式柱不仅会在火灾升温阶段达到极限状态,而且在火灾降温阶段也可能达到极限状态,且荷载比相同时升温时间比越大,或升温时间比相同时荷载比越大,柱越有可能在火灾降温阶段达到极限状态,且降温破坏时间越小。

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