Mechanical Performance Of Inclined And Arched Concrete-filled Rectangular Steel Box Tower In A Cable-stayed And Self-anchorage Suspension Composite Bridge

Cable-stayed-self-anchored suspension combination structure shape characteristic isbright, fine and good-looking structure, the outstanding landscape effect, and is thecombination of a novel architecture appeared in recent years. Because this article puts forwardthe three towers cable stayed-self-anchored suspension bridge has no a mature bridge exampleat home and abroad, so the lack of design experience, design theory and method, need to befurther research. On the basis of the whole bridge system research, this article exploreddiagonal steel box arch concrete deputy mechanical properties of the tower. According to thestructure design, parameter analysis, and the process of the plane-space-fine analysis, thisarticle carried out detailed study about mechanical properties of the tower got the followingmain conclusions:(1)In diagonal steel-box concrete inclined arched tower structure parameter studies, mainstructure parameters are determined primarily deputy tower; On the basis of overall analysisof a bridge, in view of the structure size, thickness of steel plate and concrete contribution tocarry out the parameter analysis and research, this article preliminary understand themechanical characteristics of tower structure.(2)Ignoring the problem of local stress of upper vice tower anchorage area, for thepurpose of examining the overall stress state of the vice tower, this article worked at thedeputy tower integral space finite element analysis. The calculation results show that in thenormal service condition, deputy tower steel box the most unfavorable control section of themaximum principal tensile stress is37.7MPa, the maximum principal compressive stress is85.5MPa; The maximum principal tensile stress of concrete of vice tower is1.34MPa, themaximum principal compressive stress is8.05MPa. These value are less than the standarddesign.(3)In order to fully grasp the vice tower top the mechanics properties of main cable andcable anchor back area, select deputy tower C section steel box maximum cable force forlocal refinement finite element analysis, the results show that the maximum peak principaltensile stress of anchorage is199MPa, maximum principal compressive stress is287MPa,belong to the plate hole stress concentration phenomenon, the range is very small; Maximumprincipal tensile stress value of anchor box is56.3MPa, the maximum principal compressivestress is108MPa, steel allowable stress value is less than the standard regulations.The results show that, the structure parameter design of the deputy tower of the threetowers cable stayed-self-anchored suspension composite bridge is reasonable, the global orlocal stress can satisfy the requirements of specification, can ensure the safe operation ofrelying on the bridge engineering.