Study On Mechanical Behavior Of Composite Beam Cable-stayed Bridge Of Rigid Fixity System With Two Unequal-height Pylons

Cable-stayed bridges can be classified into different structural systems according to different connection modes of towers,beams and piers,and the structural characteristics and mechanical behaviors of different structural systems are significantly different.Therefore,the applicability of structural systems is considered when designing bridges at the beginning.It is especially important.In this paper,the Chongqing Lingshui Jialing River cable-stayed bridge is taken as the engineering background,and the finite element simulation analysis is carried out based on the characteristics of the high and low tower consolidation system.Firstly,the Midas/civil bar system model is established to analyze the stress characteristics of the asymmetric towers.Secondly,the cable-stayed bridge models with different structural systems are constructed to simulate and analyze the mechanical properties of cable-stayed bridges with different structural systems.The advantages and disadvantages of the system;finally,through the Midas/FEA refinement model,the complex stress characteristics of the consolidation zone of the rigid frame system are discussed and the optimization suggestions are put forward.The main research contents of this paper are as follows:(1)Reviewing the development history of cable-stayed bridges in domestic and foreign literatures,introducing engineering examples,research status at home and abroad,and briefly describing the analysis theory of cable-stayed bridges,and proposing the use of solid element finite element models for localized consolidation areas.The need for detailed simulation analysis.(2)Based on the actual project,the integral bar system model was established by Midas/civil finite element software.The asymmetric structural characteristics of the high and low tower cable-stayed bridge were studied.The cable-stayed bridge of the system was summarized in the construction stage and the bridge stage.The characteristics of internal forces and displacements are also discussed.The characteristics and laws of the cable-stayed bridges under temperature effects are also discussed.(3)Further study on the characteristics of high-low tower composite girder cablestayed bridges in consolidation system,and construct a support system,semi-floating system and original structure cable-stayed bridge model for finite element comparative analysis,and cable-stayed bridges with different structural systems under temperature loading The law of influence is studied.At the same time,the applicability and mechanical characteristics of the structural system of the cable-stayed bridge under the specific load combination are discussed.The good applicability of the cable-stayed bridge of the original structure under the load is explained.(4)Based on the above-mentioned research content arguments,the characteristics and laws of the consolidation of the tower pier beam of the rigid-stayed bridge are further studied.The finite element simulation analysis is carried out by constructing the Midas/FEA refined solid element model.Explore the structural characteristics of the consolidation zone and propose optimization measures...