Study On Dynamic Response And Anti-collision Facilities Of Continuous Beam Bridge Under Ship Collision

With the development of land and sea transportation system in our country,more and more bridges will face the risk of ship collision.The collision will cause irreversible damage to the bridge,and will grievously detriment the benefits of the people.Therefore,the related research springs up recently.In this paper,a bridge in Guangzhou is taken as an example to analyze the full bridge response under the action of ship impact pier,and several anti-collision schemes are compared.The related details are as follows:(1)In this paper,the major ship collision accidents are summarized,the research status and its shortcomings are sorted out,the necessity of the research are clarified.The classical calculation theory of ship collision and the existing calculation formula of ship collision force are presented,and the maximum force under 12 working conditions are calculated by using the existing formula.(2)The key points of establishing models are listed,after discussing the contact setting,the interaction of pile and soil,and the influence of water flow,the simulation models are established,and the energy transformation characteristics and the stress wave transmission law in the structure are analyzed.The high-risk stress area of the whole bridge and the position with large displacement are identified,and the stress difference of pile foundation at different positions is explored.(3)Parametric analysis is carried out to discuss the effects of ship tonnage,initial velocity and impact height on the dynamic response of the bridge.The maximum force under each working condition is worked out and compared with the calculated results of empirical formula.The influences of three factors on pile top displacement,pier top displacement and girder displacement are analyzed.(4)From the aspects of working principle,advantages and disadvantages and practical application,the commonly used bridge anti-collision facilities are expounded,and two schemes for this bridge are designed.By establishing finite element models,the anti-collision effects of the two schemes are compared from the perspectives of weakening impact force and resisting self-deformation.