基于ANSYS的钢管混凝土拱桥吊杆受火力学性能研究

The Thermal Performance of Steel Tube Concrete Arch Bridge Based on ANSYS

高温下钢管混凝土拱桥力学性能易发生变化而丧失承载力。为对探求合理的防火设计方法提供支持,运用ANSYS热分析模型开展钢管混凝土拱桥吊杆受火力学性能研究。通过数值模拟与试验数据对比验证ANSYS热分析模型的合理性,在此基础上分析吊杆受火对钢管混凝土拱桥桥面、拱肋线形及吊杆内力影响。研究表明:吊杆受火对距其30 m以内的桥面变形及吊杆轴力影响较大。本文研究可为此类桥梁防火设计及灾后修复提供借鉴与参考。

The mechanical properties of CFST arch bridges tend to change and lose their bearing capacity at high temperature. In order to seek reasonable fire protection design method, Studing on mechanical behavior under fire of concrete filled steel tubular arch bridge is studied with ANSYS thermal analysis model. Rationality of ANSYS thermal analysis model is verified by the comparison between numerical sinmlation and experimental data. On this basis, the influence of suspender fire on the deck, arch rib shape and suspender internal force of CFST arch bridge is analyzed. Result shows that deck deformation and suspender axial force within fire Boom 30 m cannot be ignored. The study can provide reference for fire protection design and rehabilitation for such bridges.