Damage Analysis Of Bridge Structure Based On Response Surface Method

Nowadays,earthquakes are frequent,landslides,floods and other natural disasters often occur,as well as some behaviors of artificial overloading have brought great challenges to the safe use of bridge structures.Bridge in the process of its design life,under the action of various environmental factors,human factors,will gradually accumulate to form a certain damage,especially the damaged Bridges after the earthquake,the damage it is often difficult to observation through external monitoring,these internal hidden trouble often inadvertently threaten the national economy and people's life.Therefore,it is necessary to judge the structural state through damage identification analysis of bridge structures to meet the needs of social development and protect the interests of the public.Due to the complexity of bridge structure by its own internal defect factors and external environmental factors of comprehensive influence,the damage of bridge internal can't positioning and quantitative analysis,need a kind of effective method to judge the structural internal damage.At present,the health of the structure of the bridge detection system under the attention of scholars around the world,also emerged many identification methods,but there are still many imperfections,need further research,has the very broad space for development.The main research results of this paper can be summarized as follows:(1)The paper summarizes the damage identification methods of bridge structures using relatively mature finite element model optimization in engineering,as well as the principles and steps of various finite model correction methods.(2)By comparing and analyzing finite element model correction technology,the steps of finite element model optimization are discussed and its advantages and disadvantages are compared.And then summarized the response surface method in the application of finite element model updating,based on the theoretical basis of the response surface method,put forward suitable for model identification of the structure of the bridge correction steps and matters needing attention.(3)The finite element model of steel truss bridge structure is established,and the response surface model is established by collecting the frequency domain data.The validity of response surface model based on frequency information in structural damage identification is validated,and it is shown that the response surface model can be used in bridge damage monitoring.(4)The damage response of a railway bridge under earthquake is analyzed by using the finite element software MIDAS.According to the damage location and the modulus of elasticity,established based on the frequency information of bridge damage response surface model,the method is verified the feasibility and reliability in engineering application,has realized the damage location identification of a bridge.(5)In view of the analysis of the possibility of injury and its possible failure modes,put forward some concrete reinforcement scheme,to quickly recover and improve the strength of the bridge damage,ensure the normal working operation.