Analysis Of Stiff Skeleton Arch Bridge Characteristics

In China, concrete filled steal tubular(CFST) has a wide utilization in bridge construction building and sharped arch bridge is one traditional deck bridge type. However, currently there are less quantity of actual example of foundation of sharped arch bridge by concrete filled steal tubular stiff skeleton. Therefore, study of construction features and forces action analysis play an important role on designing and development of stiff skeleton arch bridge and shaped arch bridge.Combined with the second Feng Huang bridge in Nansha, Guangzhou, the paper introduces the full framing foundation project and stiff skeleton foundation project. Study on the construction program simulating the two methods, it proposes a simulation method to simulate full framing wet weight status and a new stiff skeleton calculation method of the combination of three traditional analog methods. The different stiffness of stiff skeleton’s impact on the main arch force is analyzed. By comparing the two project’s construction stage calculation results of Midas/C ivil frame model, some conclusion of sharped arch bridge using stiff skeleton construction. Initially, the sequence of surrounding concrete building directly influences displacement and stress of main arch during the construction period. And the earlier one’s displacement and stress is larger than the later one. Then stiff skeleton construction project has to build the surrounding concrete of main arch by several times, so its stress distribution is less uniform than full framing construction main arch. Moreover, both two main arch’s displacement and stress distribution are similar and the values are close when ten year after finishing the whole bridge. Finally, the construction conditions determine the project of building sharped arch bridge.Using Midas FEA analysis software to build a solid model of a main part of the second Feng Huang bridge, this paper analyzes the stress of binding segment of the main arch and the main podium as well as the cross-section of large changing stiffness. Besides, transverse stress analysis of arch cross-section is studied. By solving the nonlinear solid model, further it calculations stiff skeleton arch stress and crack distribution. Comparison of the solid model and frame model shows that the value of top tensile stress of binding segment of the main arch and the main podium calculated by the latter is bigger than the former ’s, so arch bridge designed by frame model is somewhat safe. Furthermore, Stress concentration is most possibly appear on the same cross-section of support cushion stone. Somewhere of the bridge cracks which ful y the norm.The effect of the concrete main arch’s displacement and stress is calculated and analyzed when the arch is under the gradient temperature or system temperature of China newest norm.The results showed that the temperature effect level is as high as the dead weigh effect. Consequently, neither of two temperature effects can be ignored for sharped arch and bridge structure designer should pay great attention to them.