| In the nearly 10 years, some collapse accidents occasionally happened due to bearing capacity deficiency of the bridge-crane structure in service. Especially in recent years, a great part of the bridge-cranes be produced before 1980's are step into the stage of aging, but for reason of the cost, some of them are still in used as before. In order to evaluate the bearing capacity correctly for the sake of production safety, this paper developed a method based on the tested data and the theory of reliability to evaluate the bearing capacity of the bridge-crane structures. The paper firstly simulates the real bearing conditions of the bridge-crane, and establishes the finite element analysis model of the crane structure, and get the stress distribution and the weak bearing capacity points of the bridge-crane structure. In order to fully get the real bearing conditions of bridge-crane and get the correct data for the bearing capacity reliability evaluation, develop a method on testing the bearing capacity of weak points of the bridge-crane structure, including the methods of no destruction test and stress test. On the base of finite element analysis and testing on the bearing capacity, set up reliability evaluate model based on the bearing capacity of the bridge-crane structure. The model fully considers the random of the factors that affect the bearing capacity, and evaluate the bearing capacity in certain evaluate norms. In order to conveniently use the method in practice, developed a bearing capacity evaluation software. Furthermore, this paper firstly put the theory of random and fuzzy reliability theory into the evaluate research of the bearing capacity of the bridge-cranes. Both consider the random and fuzzy factors of the bearing capability of the bridge-cranes, setup a evaluate model based on the above theory. At the end, summarize the theory of the bearing capacity evaluation method for the bridge-crane structures, and foretell the advanced research.
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