Based On The Stiffness Vessel-bridge Collision Force Research By Numerical Simulation And Experimental Methods

With the rapid development of China’s road and rail transport networks, in recent years, China have built a large number of bridges across the busy shipping lanes. The bridge across the waterway as the buildings of ship navigation is undoubtedly an obstacle, with the step-by-step increase in the number of ships in the event of domestic and foreign ship hit the bridge is also a frequent occurrence. This article is precisely under such background, research on bridge ship collision force. This stage,there are a lot of domestic and foreign ship collision force formulas, there is a big difference and each impact force formula, factors affecting the consideration are also different The impact stiffness is the most important factor in the impact force formula,which has not been well represented., Based on this, this article in the "Three Gorges Reservoir area of Chongqing City River Bridge ship collision force of ship collision design guide" in the foundation for further research. In this study, the research work undertaken are as follows(1) Using numerical simulation method to simulate the the1000DWT ship hit pier and cap of single column bridge and double-column bridge, in accordance with the same reinforcement ratio, different concrete strength and the same concrete strength, different reinforcement ratio and different forms of analysis,based on a large number of numerical calculation,the guidelines formula amended(2)Base on the amendment proposed formula, design a test program. Using the same type of percussive quality and variable collision height can get different impact energy, which has reached the purpose of loading the test beam. The context were set in three different conditions, first,the model of impact were raised to the desired height, and then released so that the drop hammer make the gravity acceleration to impact test beam. Condition1will improve debris to1.8m from the top of the test beam,then release from high position, impact rectangular test beam,Condition2will improve debris to1.8m from the top of the test beam,then release from high position, impact cylindrical test beams, Condition3will improve debris to1.8m from the top of the test beam,then release from high position,impact rectangular test beams(3)On the statistical analysis in acceleration and displacement of the key parts of the test proceeds, the the cylindrical beam impact resistance is stronger than rectangular beam.Under the same impact energy, the energy of the cylindrical beam can be reduced by34.2%(4)The comparative analysis of the test simulation data with the measured data from the analysis results, the simulation data on average is a large close to2.2times than the measured acceleration, them analyze the influencing factors which causes the results. In this paper, analyzing in the form of different concrete dynamic constitutive and adjust the bearing vertical stiffness.In the end,make the outlook of ship collision research,sum up the content of which needs further study.