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

A technology of composite beams and auxiliary piers, which is applied in the direction of cable-stayed bridges, bridges, bridge parts, etc., can solve the problem of negative bending moment of composite beams, and achieve the effect of enhancing the flexibility characteristics

Inactive Publication Date: 2020-03-24
CHINA RAILWAY BRIDGE SCI RES INST LTD +2
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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 und

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

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 , Figure 5 and Figure 6 As shown, the invention discloses a method for reducing the negative bending moment of the composite beam at the auxiliary pier of a cable-stayed bridge under the action of live load, which reduces the negative bending moment of the composite beam at the auxiliary pier attachment under the action of live load, the method Contains the following steps:

[0034] S1: Place the elastic support on the support pad 22, install the temporary pier 14 above the auxiliary pier 21, and hoist the composite beam 20 so that the elevation of the composite beam 20 is H 0 +L 1 ; among them, H 0 Design elevation for the bridge; L 1 Arch the elevation for the composite beam 20.

[0035] S2: Fix the upper part of the elastic support to the composite beam 20 through bolts; fix the lower part of the elastic suppor

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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

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Claims

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Application Information

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Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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