Damage Identification Research Of Variable Height Reinforced Concrete Continuous Beam

Based on integrative stiffness model of continuous beam as the first condition,using the second difference of reactions constitute evaluation index,the static and finite element theory,the simulation of continuous beam damage status,to establish three span continuous beam damage location identification theory of the static response model.Calculation results using the theory of the established model,the evaluation index of variation under different damage state,according to the properties of static response evaluation index,to identify the damage location accuracy and sensitivity of request.Using the data from the static response of the structure before and after damage research between the evaluation index and the damage structure new static damage identification method,taking other static damage identification methods can not meet the accuracy of the results.(1)The paper structure finite element analysis software MIDAS,according to the reinforced concrete continuous beam of variable height,three spans continuous beam MIDAS finite element model is set up.Professional qualification method according to the structure of the force,the establishment of three spans continuous beam force method equation,lay a theoretical basis for study of this article after the damage identification.(2)To solve the traditional mechanics analysis of the stiffness of discontinuous distribution encountered the problem,on the basis of the theory of static and Fourier series theory,based on the reinforced concrete continuous beam of variable height,stiffness of continuous beam integration model is established.The stiffness model of reinforced concrete continuous beam structure can be random discrete cracks or defects using the unified integration stiffness model,said three span continuous beam damage mechanics model is set up,calculation under moving load,the key control section of counteracting force influence line,and use the accuracy of MIDAS software model checking.(3)Based on continuous beam stiffness model integration,research ofreinforced concrete continuous beam after the occurrence of injury of counteracting force influence line of quadratic differential change value,according to different damage state of counteracting force influence line of quadratic differential curve of reinforced concrete continuous beams damage location,identification and bearing capacity estimation,complete the damage identification.