| Summary: | 碩士 === 國立暨南國際大學 === 土木工程學系 === 102 === Structural steel design allows steel members subjected to cyclic loading caused by the earthquake generated a large number of plastic deformation. However, the experiment was found beam-column joints already generated a large amount of fatigue cracks before plastic deformation. To deal with metal fatigue problem, the steel members behavior of cyclic loading must be understood. Numerous studies in the past have been analyzed by elastic-plastic finite element calculation of its force and displacement of the loop, but these analyzes assume that steel components do not contain cracks. In this paper, by a two-dimensional cantilever beam and three-dimensional damping steel plate finite element analysis of the introduction of fatigue cracks in the model to calculate the force - displacement loop. The key of this problem is how to prevent the two crack surfaces crossed, and the two-dimensional beam controls crack surface nodes to achieve the goal, and three-dimensional damping steel plate crack surfaces add spar elements to avoid crack surfaces crossed. The finite element analysis result can effectively simulate the trend of force-displacement loops decay with crack growth, and the effect of the force - displacement loops to the size of the element size and the size of the divided displacement are no significant.
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