A Method of Strengthening Steel Beams with Shear Defects Using GFRP

Abstract

The invention relates to a method for reinforcing shear defect steel beams by using GFRP. The method is to symmetrically arrange GFRP members on both sides of the steel beam web to be reinforced, wherein the GFRP members include a bottom plate, a pair of vertically arranged on the bottom plate The vertical ribs on the top and a plurality of horizontal ribs vertically arranged on the bottom plate, the horizontal ribs are distributed between two vertical ribs at intervals, and perpendicular to the vertical ribs, the vertical ribs and the horizontal ribs form a plurality of cuboid cavity structures , the bottom plate is bonded to the steel beam web. With this method, when the steel girder is subjected to excessive shear force and the steel girder web starts to buckle, the section properties of the weak web will change due to the external GFRP members, and the bending stiffness will increase. Re-buckling, so as to make full use of the bearing capacity of the steel beam web itself, and enhance the bearing capacity and shear strength of the steel beam.

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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