The Stability Analysis And Construction Monitoring Of Long-span And High-pier Continuous Rigid Frame Bridge

Based on the finite element analysis method, the paper takes Chuankouhe River Bridge(53.15+385+53.15) which is located in a new building railway LinYou mine to railwaydedicated line of BaoJi second power plants as the engineering background. This large-spanand high-pier continuous rigid frame bridge is created the finite element model by theprofessional large-scale bridge finite element software MIDAS/CIVIL, discussing geometricnonlinear analysis method and solution method of the bridge structure. The paper analyzesimportantly forces and stability of the long-span and high-pier continuous rigid frame bridgein the construction and using phase, studies construction monitoring of the bridge,anddiscusses the linear and stress monitoring of this bridge in the construction process. Finally,the paper concludes that the stability coefficient and construction monitoring of thiscontinuous rigid frame bridge.Taking this continuous rigid frame bridge as a example. Firstly, the paper discussesself-stability of the piers under longitudinal and transverse wind loads. Secondly, paperdiscusses stability of the bridge in the most unfavorable construction stage, such as: themaximum cantilever state, under wind loads,hanging basket normal work and falling. Finally,after building the bridge, the stability of the whole bridge is discussed by considering the roleof traction or braking force in the role of dynamic load on e ach span. These analysis showthat the bridge stability is the worst in the maximum cantilever state, especially when hangingbasket does not normally work. After building the bridge, the overall stability of the bridgeimproves, which is because the overall contact become stronger. The biggest cantilever stateand hanging basket stability should be paid special attention, after building the bridge, theload should be symmetrical balance to ensure that the stability of the bridge. Since stability ispoor under load combination1and full-bridge full load, so this two phases are choose to dobridge nonlinear analysis, it can be drawn that stability of nonlinear analysis is down, but theoverall meet the stability design requirements.The last chapter of the article analyzes the significance, necessity, content and methodsof construction monitoring, and taking Kawaguchi River Bridge as an example to carryingout a detailed description for the construction monitoring, detailed list the cumulativedisplacement and cumulative stress of the bridge in various construction process. Theconclusion is that because of applications of the construction monitoring, in the constructionprocess and after building the bridge, the linear and stress deviation of the bridge are amongthe reasonable range, all kinds of indicators meet the design requirements.