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The frame analysis program by using a stress-fiber model is employed to the impact response analysis. The members are modeled by beam-column elements with a cross section consisting of stress fibers. ...The collision model is developed to consider that Tsunami flotsam collides with the CFT specimens. The gap element is employed to model the contact and separation between Tsunami flotsam and CFT specimens. The precision of analytical models of the frame analysis is confirmed by the comparison with the impact test results. Being based on a parametric numerical study by the analysis, it is discussed the influence of axial load on an energy absorption capacity of a CFT member under impact loading. Furthermore, the ultimate capacity of a CFT member taking the account of the potential energy release by axial load, which is equal to the upper bound of input energy by impact load, is theoretically introduced. The concept of the ultimate impact capacities of CFT members is expected to construct the evaluation method of impact capacity of CFT structures.続きを見る
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