针对某500 t全地面H型支腿形式的起重机部分工况出现支腿翘腿的问题，建立了下车结构的有限元简化模型，研究了车架、支腿的刚度对支腿抬腿量的影响，分析得出下车各部分结构的刚度对支腿抬腿量的影响规律，为起重机下车结构的合理设计提供一定的参考依据。%Aiming at the problem of leg-upturning of the crane with 500t full-ground H-leg in certain working condi-tions, the simplified finite element model is built for the chassis structure, to study the effect of stiffness of frame and leg on leg upturning amount, and work out such effect rule, hence to provide certain reference for reasonable design of crane's chassis structure.
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