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桥式起重机主梁的合理设计必须保证:在允许的工作条件下不致因为丧失强度和稳定性而破坏起重机工作,也不致因为丧失足够的刚度——产生过大的挠度、过长的振动——而妨碍起重机的工作。合理的设计应当在满足使用要求的条件下,使得主梁的自重最轻而且制造上也比较便利。这时必须是强度或刚度中的某一指标达到了许可值,而其他指标则在许可范
The proper design of the girder of a bridge crane must ensure that the crane will not be damaged by the loss of strength and stability under the allowable operating conditions and will not lose its rigidity due to excessive stiffness - excessive vibration and excessive vibration - While hindering the crane’s work. Reasonable design should meet the requirements of the use of conditions, making the owner of the lightest weight and manufacturing is also more convenient. At this point must be a strength or stiffness of an indicator has reached the allowable value, while other indicators are permitted