多塔斜拉桥承受电缆融冰雪温度荷载的数值模拟方法

Numerical Simulation Method of Multi-pylon Cable-stayed Bridges under Melting Ice-snow Temperature Load Induced by Electric Cables

热力融冰雪技术随着工程应用的进展得到较为广泛的应用,由于其温度场的特殊性和多塔斜拉桥结构的复杂性,关于该温度荷载对多塔斜拉桥力学性能影响的研究还较少。分析实体单元通过施加节点温度来模拟温度场的可行性,研究了约束方式和横隔板对温度荷载作用的影响,由此提出建立混合单元并施加节点温度来模拟温度场的数值模拟方法。最后分析了一座多塔斜拉桥在电缆融冰雪温度荷载作用下的力学性能。

The technology of melting ice-snow through heating method has been used widely with engineering applications. Due to the particularity of the temperature field and the complexity of the multi-pylon cable-stayed bridges, a few researches have been reported on the influences of the temperature load on the mechanical properties of multi-pylon cable-stayed bridges. In this paper, the feasibility of simulating temperature field is analyzed with the method of applying node temperature on the solid element. The impacts of constraint modes and diaphragm on the temperature load are studied. Thus, the numerical simulation method of building mixed element and applying node temperature to simulate temperature field is proposed. Finally the mechanical properties of a multi-pylon cable-stayed bridge under melting ice-snow temperature load induced by electric cables are analyzed.