考虑热-机械耦合作用的无拱度桥式起重机主梁挠曲分析

Deflection analysis on arch-free main girder by bridge crane considering thermal-mechanical coupling

无拱度桥式起重机主梁的研发对于起重行业的创新发展具有重要的意义。在复杂多变的多物理因素耦合工况下,无拱度主梁的荷载与挠度之间的关系较为复杂。在考虑温度荷载作用下,搭建了无拱度主梁桥式起重机的挠度与应力理论分析模型,并给出了相应的计算公式,探讨了在温度、跨度、起质量、宽度和高度的多物理耦合因素作用下,无拱度桥式起重机的主梁挠度与应力的变化影响规律。同时以32 t-25.5 m无拱度桥式起重机主梁为研究对象,在热-机械耦合工况下,通过理论与有限元模型仿真对比分析,验证了其理论公式的合理性。研究成果对于无拱度桥式起重机的设计研发和拱度取消安全范围制定标准提供理论指导。

The development of arch-free main girders characterized by bridge cranes are of great significance to innovation and progress of the lifting industry.The relationship between load and deflection of arch-free main girders is vitally complex under multiple physical coupling conditions.In this article,with the temperature load taken into account,the theoretical model of the arch-free main girder characterized by bridge cranes’deflection and stress is set up,and the calculation formula is worked out.The changing rule of deflection and stress with multiple physical coupling factors of temperature,span,lifting weight,as well as width and height is explored.At the same time,with the 32 t-25.5 m arch-free main girder characterized by bridge cranes taken as the research object,rationality of this theoretical formula is verified with the help of comparison among the related theories and the finite-element stimulation with thermal-mechanical coupling.These results provide theoretical guidance for design and development of arch-free bridge cranes and formulating the safety range of arch-free main girders.