Study Of The Design Theory Of Long Span Steel-concrete Composite Arch Bridge

According to the trend of the construction of long-span arch bridge across thevalley terrain, to reasonable use of material properties, simplifying the constructionprocedure, shorten the construction period, lower the project cost as the main startingpoint, the exploratory put forward a kind of based on tower cable stayed cantileverconstruction combined with the cables section with concrete construction technologyof arch foot, using new steel structure of large span steel arch section-mixed concretecombination arch bridge. Construction method based on combination of steel andmixed combination arch bridge as a new structural type, its mechanical properties willhave different traditional reinforced concrete arch bridge, have to the study of themechanical performance of system. Around this topic, this paper conducted thefollowing research works:①To collect related arch bridge cantilever casting construction and cablehoisting construction at home and abroad research data and research results, on thebasis of analyzing the existing two kinds of the cantilever construction method andLanSuoDiao method with the advantages and disadvantages, in wanxian municipalityYangtze river bridge as the prototype, using the ANSYS parametric programmingtechnique, using APDL language preparation of steel-concrete composite arch bridgethe arch axis coefficient and mixing optimization program.②Based on the practical project, designing a large span steel-concrete compositeArch bridge, afterthe analysis model of the whole bridge is established, going on theanalysis of the basic force, and the bearing capacity of the whole bridge checking andstability checking.③On the bridge example for whole bridge bearing capacity test design checkingand stability checking, based on the piecewise point location coefficient as parameter,multi-group analysis model is established to study the effect of piecewise pointposition on the coaxial coefficient, comparative analysis of different segmented pointposition on the internal forces of the arch ring, the influence of the stress anddeformation, provides the reasonable basis for the selection of piecewise pointlocation.④To investigate changes in variable cross section form, change law of structuralinternal force onvariable cross section, and the influence of the deformation change rule, from the aspect of the structure and technical and economic index is higher, forthe steel concrete bridge main arch ring and mixed form of section design is putforward reasonable design proposals.