Reinforcement method of anti-arch structure based on reduction of negative bending moment at arch foot of arch bridge

Abstract

The invention provides an inverted-arc structure reinforcing method based on decrement of the hogging moment of arch feet of an arch bridge. According to the inverted-arc structure reinforcing method based on decrement of the hogging moment of the arch feet of the arch bridge, an inverted arch is arranged below an arch rib of a main arch ring, and the inverted arch and the arch rib are connected through a vertical rod; then the arch feet of the inverted arch and the arch rib are connected through anti-bending embedded parts and anti-shear anchor bolts, so that the inverted arch structure used for reinforcing and the original main arch ring form a rigid restrained supporting system; and the decrement degrees of the hogging moment of the arch feet of the arch bridge in the rigid restrained supporting system have a close relation with seven parameters of a to-be-reinforced arch and the inverted arch. By setting different variable values of the seven parameters, the ratio of the hogging moment of the arch feet of the original arch to the hogging moment of the arch feet after reinforcement is used as the change characterization of the bending moment, and a relational expression between the seven parameters and the change characterization of the bending moment is obtained based on a finite element parameter analysis fitting method. By adoption of the inverted-arc structure reinforcing method based on decrement of the hogging moment of the arch feet of the arch bridge, the structural characteristic internal force value can be solved based on the relational expression, and thus the optimal scheme is selected for inverted-arch reinforcement.

Description

technical field [0001] The invention belongs to the technical field of arch bridge reinforcement, and in particular relates to a reverse arch structure reinforcement method based on the reduction of the negative bending moment of the arch foot of the arch bridge. Background technique [0002] Arch bridge is a bridge structure type that is widely used on highways in my country and has a long history, especially in Guangxi. However, with the aging of materials and increasing traffic volume, most bridges can no longer meet the operational needs. Some concrete arch bridges have heavy self-weight, and the main arch ring is mainly under pressure. The lack of pressure often causes more cracks in the arch ring, and a few have obvious downward deflection in the mid-span, which reduces the bearing capacity and comfort; if it is demolished and rebuilt, it will take time and effort, but There is no good reinforcement method at present. [0003] Common reinforcement methods for concret...

AI Technical Summary

Problems solved by technology

A large number of examples show that the effect of the original method of reinforcement is very little, and the degree of adhesion of the old and new materials directly affects the effect of the reinforcement. Soon after the bridge is reinforced, the old and new materials will be detached, and the bonding force will decrease. Common faults such as cracks caused by excessive negative bending moment at the arch foot of the main arch ring of the bridge cannot be well improved

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