Method for shearing defect steel bridge strengthening by employing GFRP

Abstract

The present invention relates to a method for shearing defect steel bridge strengthening by employing a GFRP. The method comprises the steps that: GFRP members are symmetrically arranged at two sidesof a steel bridge web to be strengthened, the GFRP member comprise bottom plates, vertical ribs vertically arranged on the bottom plates and a plurality of cross ribs vertically arranged on the bottomplates, each cross rib is distributed between each two vertical ribs at intervals and is perpendicular to one vertical rib, the vertical ribs and the cross ribs form a plurality of cuboid cavity structures, and the bottom plates are pasted on the steel bridge web. According to the method, when the shear of the steel bridge is too large and when the steel bridge web starts to bend, the GFRP members are externally pasted at the web at the weak position to change to section features and increase the anti-bending rigidity, and the wed cannot be bent under the shear effect so as to fully utilize the bearing capacity of the steel bridge web itself and enhance the bearing capacity and the anti-shearing intensity of the steel bridge.

Description

technical field [0001] The invention relates to the technical field of building components, in particular to a method for reinforcing steel beams with shear defects by using GFRP. Background technique [0002] When the steel structure is subjected to compression, bending, shearing or under complex stress, if the width-to-thickness ratio of the plate is too large, local instability will often occur. After local instability, some plates buckle and withdraw from work, causing The reduction of the effective section of the component will accelerate the overall instability of the component and lose its bearing capacity. The traditional method of strengthening steel members to avoid local instability is often achieved by setting stiffeners, and the division of plate divisions is changed by setting stiffeners. Stiffeners provide greater rigidity outside the web plane and form support conditions for the enclosed plate domain to change the width-to-thickness ratio and length-to-width...

AI Technical Summary

Problems solved by technology

[0003] However, stiffeners are often added to the web by welding, which often leads to fatigue damage of components due to stress concentration

In the prior art, it is relatively common to use composite materials to reinforce concrete and masonry structures. The higher uniaxial tensile strength in the plane is used to constrain the concrete or masonry structures and enhance their bearing capacity. See the report on the strengthening of steel beams with shear defects by using GFRP

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