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Portal crane is indispensable to modern industrial production equipment,used in lifting,transportation,loading and unloading of materials and so on,what has greatly raised labor productivity.The gantry structure bearing rotating platform and all of the above structure,the stability of the gantry decides the stability of the crane.This article through to different gantry structure of the portal crane stress test,analysis of force of the gantry structure,and get the gantry typical state of stress distribution.