Long-term Beharvior Of Concrete-filled Steel Tubular Arches With Large Slenderness

As a new modern form of bridge structures, the concrete filled steel tube archbridge has a strong competitive advantage in the span of70m-500m of the bridgesbecause of its high bearing capacity, spanning performance, high construction-efficiencyand good appearance. Although the concrete filled steel tube arch bridge has beenwidely used, the understanding of the mechanical properties of concrete filled steel tubearch is so limited that influence the development of this type of bridge. Though thelong-term static properties of concrete filled steel tube arch has got widespread attention,these existing research were carried out only for specific bridges and the relevant testdata is too insufficient to guide the design, there is a strong need for more in-depthstudy of this system.This article will use the ABAQUS finite element model and focus on long-termstatic performance of the concrete filled steel tube arch whose ends are fixed.Thisarticle will analyze the parameters include: steel ratio, slenderness ratio, loading age,holding charge time, the scope of the design parameters based on actual results. Thisarticle will focus on how the aging effect influence the long-term effects of concretefilled steel tube arch under0.5times limit load bearing capacity, and there is a bigdifference between different parameters. Since the slenderness ratio of no wind bracingconcrete filled steel tube arch bridge is quite big, rib-section in the event of instabilitydo not enter the basic plastic material.On this basis, and base on ABAQUS finiteelement model to ensure that before the plane buckling displacement Rib same principle,by adjusting the initial defect Rib, you can consider the establishment of a central rolein the impact of aging concrete pipe concrete arch bearing capacity limit state of planestability simplified analysis. So that it will be feasible to use this method that increasinginitial defect to consider how the aging effect influence the out of the plane stabilitycapacity of CFST arch.Compare the simplified method of analysis results and theanalysis results of the research group of pre-established analytical method, then verifythe reliability of this simplified calculation method. Finally, I will do some preparationfor the design and processing of concrete steel arch long-term static performance pilotprogram to study how aging effect influence the long-term deflection of CFST arch,section of the plane stress distribution and stability.