Mechanical Analysis On Composite Arch Bridge

With the rapid economic development, China’s bridge construction has also beendeveloping rapidly. In modern bridge construction, bridge type selection not only requires thereasonable force, structural safety, easy construction, but also attractive appearance. Throughcontinuous bridge construction practice, there has been more and more bridge type, and thisarticle focuses on the composite arch bridge.Started from the introduction of the development profile of the composite arch bridge,this paper firstly introduces the difference of the major component of the composite archbridge,classifies the composite arch bridge and introduces their mechanical characteristics.Then the research progress of calculation theory of the composite arch bridge and archcalculation theory based on the finite element theory and stability theory are introduced indetail.The composite arch bridge, combined by arch and other bridge types,is a developmentfrom the traditional arch and integrate their merits. It is sleek, reasonable structure, easyconstruction, and with the application of new materials in the arch, the composite arch bridgehas been widely applied in China. As a new structural system, the composite arch bridge iscomplex in mechanical characteristics, compared with the bridge construction, its calculationmethod are a little backward.There are more and more problems in the construction processand stability.According to the features of design and construction of the composite arch bridge, to athrough tied-arch bridge as an example, it is analyzed from these aspects in detail:(1)The project profile, overall arrangement of the whole bridge, calculation model andcalculation load are firstly introduced, then the construction phases division, closed schemecomparison and construction process are stated, at last, the construction phases are analyzedand analysis results are given.(2)Based on the basic theory of the stability and calculation theory of arch stability, twoclasses of arch stability, instability criterion and stability evaluation index and the calculationmethod of stability of arch in our specification are introduced.According to these theories, the stability of this bridge are analyzed and analysis results are given.(3)The through tied-arch bridge are analyzed in some aspects,and the main contentincludes: diaphragm calculation, derrick beam calculation and bridge deck calculation.Atlast,it presents analysis results.