Study On Formula Of Collision Force For Cumulative Impact Damage Of Reinforced Concrete Bridge Piers

In recent years,the transportation industry has achieved unprecedented development.The frequent occurrence of collision accidents between bridges and bridges has also caused serious damage.After the bridge collision accidents have been detected and repaired,they will often continue to be put into use,which will cause damage to the bridge belt.How to determine the damage state of a bridge and the magnitude of the collision force when it encounters an impact again has important guiding significance for the anti-collision design of the bridge.This paper analyzes the existing ship-bridge impact studies both at home and abroad,and finds that China's ship-bridge collision problem needs further study,especially the research on ship-bridge collision under cumulative impact conditions is rarely reported.In this paper,under the condition of cumulative collisions between bridges and bridges,considering the damage of bridge piers,the analysis is based on the conservation of energy,and the numerical analysis method is used to study the impact force of bridges and bridges and the damage of bridge piers.The collision force considering the damage of bridge piers is proposed.The formula is calculated.Finally,the horizontal cumulative impact test of the pier is performed to analyze the applicability of the formula.The main work of this paper includes the following aspects:1.Analyze the existing ship-bridge collision related research,summarize the calculation and test methods for ship-bridge impact force,and propose that the research on ship-bridge cumulative collision needs to be further improved.2.In order to explore the applicability of ultrasonic damage detection technology in the damage detection of reinforced concrete bridge piers,analyze the effect of different reinforcement ratios on the detection results,design and manufacture 13 short column specimens for ultrasonic testing,and obtain ultrasonic testing.Based on the reliability of the damage and some laws,it provides a basis for the study of the impact strength of the cumulative impact damage of the pier.3.Analyze and study the cumulative collision of ship bridges and consider the damageof bridge piers.Based on the principle of conservation of energy,the collision force formula is deduced.Through the introduction of damage factors and numerical analysis methods,the cumulative collision of ship bridges is further studied,and the damage caused by ship bridge under cumulative impact conditions is proposed.The collision force calculation formula.4.Applicability analysis of cumulative impact force formula based on pier damage.The test plan was designed and six pier specimens were made for horizontal cumulative impact tests under different conditions.Finally,the results of the test were compared with the standard formula and the results of the collision force formula.It was proved that the piers were subjected to cumulative collisions and the formulas were calculated.The collision force is closer to the actual situation and has certain applicable value.