Mechanical Performance Analysis Of Rigid Frame-Continuous Structure System Beam Bridge With Combined Piers

Based on the theory of bridge structure stability,this paper studies the mechanical properties of the rigid frame-continuous structure system bridge with combined pier,including critical load,stable characteristic value,deformation,bending moment and other related issues.The main research contents are as follows:(1)Based on the structural characteristics of rigid frame-continuous composite structure system bridges and composite piers,the problems that need to be solved in the analysis of combined bridge piers,rigid frame-continuous structure system bridge structure were clarified through the inductive analysis of existing research results on bridge structure stability,and the corresponding research goals and contents were determined.The corresponding research objectives and content were determined.(2)Based on the structural stability theory,this paper analyzes the content and application scope of the bridge structural stability problem,analyzes the characteristics of the stability problem research method,and clarifies the appropriate research method for studying the stability analysis of the rigid frame-continuous structure system bridge with combined pier.(3)Based on the the static method and energy method from structural stability theory,the problem of critical load of the combined pier was analyzed.Based on Rayleigh-Ritz method,a formula that can estimate the first type of stable critical load of the combined pier under different boundary conditions was derived.The rigid frame stability theory was used to analyze the critical load of the bridge pier in the rigid framecontinuous structure system,and the stability equation,applicable scope and solution method of the bridge pier in the rigid frame-continuous structure system were obtained.(4)Through the finite element numerical analysis of the engineering example,the stability safety factor of the bridge pier of the rigid frame-continuous structure system bridge pier under the different working conditions of each construction stage was clarified.The factors influencing the mechanical performance of the combined pier rigid framecontinuous structure system were discussed,and the influence of factors such as the height ratio of the boundary point,the height of the pier,the wall thickness of the pier body on the critical load of the pier and the stability eigenvalue,deformation,bending moment and stress of the structure were obtained.The proposed value of the parameters of the rigid frame-continuous structure system bridge combined piers was put forward,and the scheme design method of the combined pier in the rigid frame-continuous structure system bridge was formed.