According to the Qiantang River Bridge project, the pile structures are adopted as protection devices for bridge piers. Because the pile structures are not contact with bridge piers, the traditional design method of impact force control is no longer applicable. Therefore, this paper studies on the large deformation characteristics of piles, takes the interaction between the piles and soil into account by “m” method, puts forward a new anti-collision design method, and at last determined the form and dimension of pile structures. LS-DYNA, a nonlinear explicit dynamic finite-element code, was used for analysis. The protection devices are used to Qiantang River Bridge, and then some useful conclusions were achieved.

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