Method for setting longitudinal stiffening rib of high web of elastic rotation constrained boundary steel-concrete composite beam

Abstract

The invention relates to a method for setting a longitudinal stiffening rib of a high web of an elastic rotation constrained boundary steel-concrete composite beam. The method comprises the following steps: firstly building a displacement function equation with the elastic rotation constrained boundary and the boundary condition, deriving buckling stress calculation expression of the stiffening rib under two states of the rigid stiffening and flexible stiffening based on an energy method, and obtaining a calculation formula of the elastic rotation constrained boundary longitudinal stiffening rib critical rigidity; and then, considering external work and a minimum potential energy principle, presenting a critical buckling stress calculation formula of a non-uniform pressing plate under the elastic rotation constrained boundary; and finally, according to a buckling safety degree equal principle, obtaining the optical position of setting the longitudinal stiffening rib under the elastic rotation constrained boundary. The method is capable of, according to the actual stress situation, accurately setting the longitudinal stiffening rib of the high web of the steel-concrete composite beam, solving the problems of the current steel-concrete composite bridge bream stiffening rib that the design is conservative and the amount of the steel products is large, and remarkably improving the rationality and economy of the stiffening rib setting of the high web.

Description

technical field [0001] The invention relates to the field of bridge and culvert engineering in the transportation industry, in particular to a method for arranging the longitudinal stiffeners of the high web of a steel-concrete composite girder bounded by elastic rotation constraints. Background technique [0002] Steel-concrete composite bridges have good mechanical performance and economy, and have been gradually applied in engineering in recent years. With the continuous increase of bridge span and height-to-thickness ratio of its web, high web stability has become an important issue in bridge design. The stiffness of longitudinal stiffeners and their position settings that affect high web stability It has also become a key issue in design. [0003] At present, the stability analysis of high webs of steel-concrete composite beams often adopts the classical elastic stability theory, and its boundary conditions are simply supported on four sides, but the web boundary of st...

AI Technical Summary

Problems solved by technology

The boundary stiffness of the steel-concrete composite beam has a great influence on the stiffening design of the high web, ignoring the boundary stiffnes

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