Study On The Structural Characteristics Of Cable-stayed Continuous Cooperative System And The Optimization Method Of Its Reasonable Completion State

The design and construction of bridges should be adapted to local conditions.It’s usually very hard for four kinds of traditional basic bridge types(beam bridge,arch bridge,cable-stayed bridge,suspension bridge)which still have some limitations of application scope to meet different construction requirements in different places directly.One explicit and effective way to satisfy this diverse demand of bridge constructions is to combining multiple basic bridge types into a new cooperative system.Cable-stayed continuous cooperative system is made up of cable-stayed bridge and continuous beam bridge,which can not only improve the spanning ability of bridges,optimize structural integrality,beautify the structural pattern,but also enrich the bridge types.At present,there are few theoretical and practical studies on the bridge of cable-stayed continuous cooperative system.Based on a proposed bridge project in Guangzhou,this paper analyzes the structural characteristics of the cable-stayed continuous cooperative system bridge,and studies the optimization method of the reasonable finished dead state by combining the intelligent optimization algorithms and the finite element method.Main works are as follows:(1)This paper briefly describes the background engineering and research objects,summarizes the similarities and differences between the cable-stayed continuous cooperation system bridge and the conventional single system bridge,makes a simple analysis of the cable-stayed continuous cooperation system,and qualitatively understands the structural characteristics.(2)The finite element calculation model of the proposed bridge is established,and the similarities and differences between the joint section and the double element section model are discussed.This paper also presents a simulation approach to define the integral temperature rise and drop of the joint section by the temperature of the beam section,which provides a new idea for temperature simulation of finite element modeling.According to the loading characteristics of the structural system,and after comparing the finite element models of cable-stayed continuous cooperative system and the normal cable-stayed bridge,the static and dynamic mechanical characteristics of the system are studied,and the advantages and disadvantages of the two structural systems are analyzed.(3)The structural parameters of the proposed project are analyzed by the method of combining finite element and theoretical analysis.Considering the flexural rigidity ratio of beam tower and the axial rigidity of stay cable,the parameters of the length of cable free zone are analyzed and studied systematically,and the reasonable range of value is put forward;the flexural rigidity ratio of beam tower,the rigidity of auxiliary body,the tower span ratio and the axial rigidity of stay cable are respectively selected to analyze the parameters of the cable-stayed continuous cooperative system,and the influence coefficient concept is used to analyze the parameters of the structure The influence degree is sorted,and the influence rule of each parameter on the structure is obtained,which provides reference for the design and optimization of the proposed bridge engineering and similar bridges.(4)Aiming at the sum of the minimum bending energy of the tower and the main beam of the cable-stayed continuous cooperation system,the paper uses swarm intelligence optimization algorithms(particle swarm optimization algorithm,artificial fish swarm algorithm,global edition artificial fish swarm algorithm,optimized global edition artificial fish swarm algorithm)to determine the reasonable completion state of the cable-stayed continuous cooperation system.Introducing the particle update strategy of the particle swarm algorithm into the global edition artificial fish swarm algorithm to optimize the global edition artificial fish swarm algorithm,the effectiveness of the optimized algorithm is demonstrated,and as the caculated core of cable force optimization,this paper optimizes the cable force of cable-stayed continuous cooperative system,discusses the performance of each algorithm in the optimization of cable force;for the optimization of cable force,comparison analysis of bridge formation states determined by each intelligent optimization algorithm and unconstrained cable force optimization method is carried out,and the results show that the difference in bridge formation state obtained by each intelligent optimization algorithm is small,the intelligent optimization algorithms and the unconstrained method require similar bridge-building states,but the main beam shape of the bridge-building state is smoother;At the same time,the optimized global version of artificial fish swarm algorithm is used as the core of the calculation,and the analysis of the influence of the changes of constraints on the bridge formation state is carried out.The intelligent optimization algorithm is used to optimize the reasonable completion state,which can avoid the blindness and arbitrariness of artificial cable adjustment,provide a reliable theoretical goal for a reasonable construction state,and provide a reliable and efficient calculation method for the proposed bridge and similar bridge.From the background of the whole engineering structure,the research and conclusions are mainly to provide reference and methods for the design of the proposed bridge,and contribute to the design and development of similar bridge types.