Optimization study on ice sheet size of influence region in simulation of collision force on ice and pier

Adopting solid164, beam161, and the measured constitutive relationship of stress-strain of river ice, the finite element analysis model of percussive force of river ice and pier is established, using the explicit dynamical analysis software package LS-DYNA. The reasonable values of X and Y directions size of ice sheet in influence region are studied. Some measures for the collision force analysis of river ice and pier are proposed as follows: the ice sheet is divided into three regions, such as influence region, transition region and non-influence region; the smaller grid is adopted in influence region, the bigger grid is used in non-influence region, and the transition grid is adopted to achieve the transition from smaller grid to bigger grid in transition region; the X-length of influence region should be 10% of the total length of the ice sheet, while the Y-length of influence region should be 25% of the total length. The simulation results have the advantage of high precision through comparing the measured and simulated data. The results can be for reference in collision force study on river ice and pier.