Method for reducing hogging moment of composite beam at cable-stayed bridge auxiliary pier under action of live load

Abstract

A method for reducing the hogging moment of a composite beam at an auxiliary pier of a cable-stayed bridge under the action of live load relates to the technical field of composite beam cable-stayed bridge construction, and comprises the following steps: S1, placing an elastic support on a support padstone, installing a temporary pier above the auxiliary pier, and hoisting the composite beam to enable the elevation of the composite beam to be H0 + L1; wherein H0 is the designed elevation of the finished bridge; l1 is the arching elevation of the composite beam; S2, the upper portions of the elastic supports are fixed to the composite beam through bolts, and the lower portions of the elastic supports are fixed to support padstones through foundation bolts; S3, grouting a gap between the elastic support and the support padstone to form a grouting layer; S4, the temporary piers are dismantled, and the elastic supports are subjected to compressive deformation L1 under the action of the composite beams; in an auxiliary pier support system of the composite beam, under the live load effect of the composite beam, the elastic support generates downward vertical displacement, and the problemthat the composite beam generates hogging moment under the live load effect is solved.

Description

technical field [0001] The invention relates to the technical field of construction of a composite beam cable-stayed bridge, in particular to a method for reducing the negative bending moment of a composite beam at an auxiliary pier of a cable-stayed bridge under the action of a live load. Background technique [0002] For composite girder cable-stayed bridges, the setting of auxiliary piers plays an important role in increasing the overall stiffness and stability of the cable-stayed bridge system; but also because of the auxiliary piers, under the action of dead load and live load, the composite beam Negative bending moments often occur near the pier support. This is very unfavorable to the concrete bridge deck on the upper part of the composite beam, and even makes the concrete bridge deck there crack. [0003] Therefore, in the construction process of the composite girder cable-stayed bridge, people have come up with various methods to reduce the negative bending moment ...

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Problems solved by technology

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a method for reducing the negative bending moment of the composite beam at the auxiliary pier of the cable-stayed bridge under the action of live load, so that the elastic support of the composite beam under the action of live load will The downward vertical displacement solves the problem of negative bending moment of the composite beam under live load

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