| With the rapid development of water transportation in my country,the contradiction between the gradual increase of bridge projects across rivers and the large-scale and high-speed ship structures has become increasingly prominent,which has led to frequent collisions of ship and bridge accidents,which has brought significant traffic safety,life and property.Therefore,it is of great practical significance to carry out in-depth research on the mechanism of ship-bridge collision effects and dynamics.This paper establishes an overall finite element model of the collision between a bulk carrier and a continuous rigid frame bridge.In this paper,an integral finite element model of the collision between a bulk carrier and a continuous rigid frame bridge is established,and the influence of the substructure,superstructure and ship parameters of the bridge on the collision effect is calculated and analyzed systematically considering the different boundary conditions of the bridge and various factors affecting the collision.Based on the results of the finite element simulation analysis,the collision force simplified time-history method and the ship-bridge collision design response spectrum analysis method were studied,and a statistically significant ship-bridge collision force simplified model and ship-collision design response spectrum were proposed,and the ship-collision design response spectrum was realized.Quick prediction of bridge impact response during bridge collision.The main research contents of this paper are as follows:First of all,ship bridge collision is briefly described the research background and significance,enumerates the typical collision of ship and bridge at home and abroad,summarizes the research status at home and abroad,summarizes the experience of ship collision bridge calculation formula and related regulations,and the finite element numerical analysis method of ship bridge collision and high precision,simplified calculation method and response spectrum analysis methods are expounded.Secondly,the finite element models of 162m+162m equal-span prestressed reinforced concrete continuous rigid frame bridge and bulk carrier are established.The important structural geometrical parameters and material constitutive parameters are analyzed in detail.Hyper Mesh and LS-Pre Post were used as the front and rear processors respectively,and LS-DYNA was used as the solver to analyze the influence of pile soil and bridge superstructure on the dynamic response of ship-pier collision.Based on the ship-pier collision mechanism and considering the three main factors of ship mass,impact speed and impact water level height,the influence of the selected factors on the ship-bridge collision force and the dynamic response of the bridge is systematically explored.Thirdly,considering different ship mass and impact velocity,a total of 42 calculation conditions are set up.The corresponding collision force time history curve is obtained by finite element calculation.The collision force simplified time history method is adopted,and the appropriate function model is selected.Through the statistical analysis of the numerical calculation results and parameter fitting,the simplified ship and bridge collision dynamic load model with statistical significance is proposed.Finally,the reaction spectrum analysis method was used to establish the analysis process and steps of ship-to-bridge collision effect,and the response spectrum calculation program was compiled and verified according to the Newmark-β theory.The reliability of the program was verified by an example of half sine pulse load.The effects of ship mass,speed and bridge damping ratio on dynamic response coefficient are analyzed.The impact force was calculated by considering factors such as ship mass and impact velocity,and the dynamic response characteristic curves of the system under different conditions were obtained.The response spectrum of ship and bridge collision design was obtained based on mathematical statistics and parameter fitting method. |
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