Comparison And Model Research Of Typhoon Wave Force Calculation Methods On Offshore Bridge Superstructures

After entering the 21 st century,with the rapid and vigorous development of economic level and science and technology,a large number of offshore bridges have been built or planned in coastal areas of China.However,China is located in the coast of the West Pacific coast,which is one of the countries with the most serious typhoon disasters in the world.Most of the offshore bridges are facing the threat of typhoon disasters.The combined effect of typhoons and storm surges is one of the main reason for the damage of offshore bridges.Although scholars around the world have proposed many different wave force calculation methods in recent years,issues such as the applicability of each model and the accuracy under the same applicability range have not been studied.Therefore,the comparison of existing wave force calculation methods for offshore bridge superstructures and the development of wave force models for offshore bridge superstructures can clarify the scope of application and accuracy of each calculation model,which has important engineering value and social significance to ensure the safety of offshore bridges under wave action.This paper summarized and compared the existing wave force calculation methods for wave action on offshore bridge superstructures.According to the applicable clearance,bridge configuration and incoming wave characteristics of wave force calculation method,the calculation methods were classified and sorted.Summarized the evaluation of the advantages,disadvantages and applicability of each wave force calculation method in the public literature,this paper made a brief comparison.Chose two typical bridge types and used various wave force calculation methods to calculate typical bridge wave forces.Based on the results of the comparative analysis,a new wave force model was proposed and the accuracy of the wave force model was verified by using multiple model test data.The results of the study show that in most cases,the horizontal and vertical wave forces increase with increasing wave height and wave period.When the wave period and wave height are the same,the larger the clearance,the smaller the wave force,but when the superstructure is more submerged,the vertical wave force will decrease.The greater the thickness-to-width ratio of the bridge deck,the greater the horizontal force on the bridge but the smaller the vertical force.The greater the ratio of beam rib height to width,the greater the horizontal force on the bridge but the vertical force is basically unchanged.The slamming force varies with the wave height and period and is consistent with the overall wave force.By comparing the test results and the calculation results,it is found that the calculation results are greater than the test results in most cases.According to the comparison results,the recommended wave force model under different conditions is given.