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焰流效应下混凝土空心薄壁墩热力耦合形差与层剥分析

, PP. 46-54

Keywords: 桥梁工程,混凝土空心薄壁墩,有限元分析,形差,层剥,火灾

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Abstract:

?为了明确火灾后混凝土薄壁墩的爆裂机理,考虑流固体间的高温压力差、质量元结晶水的影响,进行了不同流速下混凝土空心薄壁墩的时空形差研究,采用热力耦合法和有限元法,给出了焰流效应下混凝土空心薄壁墩热力学模型,设计了焰流效应力学工况,分析了焰流效应下迎火面混凝土层剥机理。研究结果表明:无流速状态下混凝土空心薄壁墩迎、背火面墩顶竖向变形随延火时间呈非线性变化;随荷载比增大,迎火面墩顶火温与荷载的叠加变形曲线回至空载高度的延火时间逐渐向后推移,至延火终时的上抛值逐渐减小,背火面墩顶荷载变形由延火初时至终时的下降幅度有所增大;随气流流速增大,迎火面墩顶火温与荷载的叠加变形曲线回至空载高度的延火时间相对应各荷载比有所提前,至延火终时的上抛值有所减小,受背火部位墩身反向变形和迎火面材料高温劣化的双重影响,迎火面混凝土沿外层纵向钢筋产生竖直分层剥离;气流流速大小对空心薄壁墩迎、背火面形差及迎火面混凝土层剥影响显著。

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