主梁作为桥架式起重机起吊载荷的主要受力构件,将载荷传给端梁,然后传给轨道及厂房基础,起着至关重要的作用,因此主梁性能的好坏直接影响起重机的寿命。影响主梁性能有多方面的因素,如材质本身的性能、材料规格的选择、制作工艺的合理性、主梁上拱度、正常合理的使用等。对于桥架式起重机的主梁设置一定的上拱值,其主要目的是改善主梁的受力情况、抵抗主梁在载荷作用下的向下变 As the main load-lifting component of bridge crane, the main beam plays a vital role in transmitting the load to the end beam and then to the track and foundation. Therefore, the performance of the main beam directly affects the life of the crane. There are many factors affecting the performance of the main beam, such as the material itself, the choice of material specifications, the production process of the rationale, the main beam camber, the normal and reasonable use. For the overhead girder of a bridge crane, a certain upper arch value is set, and its main purpose is to improve the force condition of the main girder and to resist the downward change of the girder under the load