Design Points of Long-span T-shaped Rigid Frame in Mountain Area
Taking Houxi river long-span T-shaped rigid frame bridge of Wuxi-Zhenping Expressway as the research object,the calculation model of the main bridge is established by finite element program midas Civil.The bearing capacity of the main bridge,the height of the compression zone,the stress of the main beam,the construction stability of the main pier and the calculated length are analyzed and discussed.The results showed that:1)The structure size and prestress configuration of the main beam are reasonable,and the bearing capacity has high redundancy;2)The thickness of the bottom plate of the box girder can be appropriately reduced,without forcing to meet x≤ξbh0,so as to achieve the purpose of reducing the weight of the structure;3)The stiffness of the main pier is suitable and has good stability in the construction of large cantilever stage;4)When checking the strength and crack of the main pier,the calculation length should be calculated by the finite element buckling analysis and the Euler critical force.
long-span T-shaped rigid frameheight of compression zonecalculated length
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