Fatigue crack reinforcing structure and method for arc-shaped notch of diaphragm plate of steel bridge deck

Abstract

The invention relates to a fatigue crack reinforcing structure and method for an arc-shaped notch of a diaphragm plate of a steel bridge deck, the reinforcing structure comprises a crack arrest hole formed in the diaphragm plate and a shape memory alloy sheet arranged on the side face of the diaphragm plate, the inner end of the fatigue crack is connected with the arc-shaped notch, the outer end of the fatigue crack is connected with the crack arrest hole, and the shape memory alloy sheet covers the fatigue crack and the crack arrest hole at the same time. Compared with the prior art, the reinforcing structure has the advantages that through the cold repair mode of combined action of drilling crack arrest and shape memory alloy sheet pasting, welding residual stress is not introduced, the fatigue life of the arc-shaped notch of the diaphragm plate is remarkably prolonged, and the reinforcing structure has the advantages of being simple in reinforcing mode, relatively low in manufacturing cost, low in construction difficulty, convenient and rapid to install and the like.

Description

technical field [0001] The invention belongs to the technical field of orthotropic steel bridge decks, and relates to a structure and a method for strengthening fatigue cracks at arc-shaped cutouts of transverse diaphragms of steel bridge decks. Background technique [0002] Orthotropic steel bridge decks are often used as the deck structure system of steel bridges because of their outstanding advantages such as light weight, large bearing capacity, wide application range, and short construction period. Fatigue failures of the orthotropic slabs of many early-construction long-span steel bridges have occurred due to the increased traffic generated by the increasingly developed economy. After these fatigue damages occur, not only will it induce various diseases such as bridge deck pavement reflection cracks and pits, but it will also directly affect the safety of the structure when the cracks develop to a certain extent. Therefore, it is of great practical significance to rep...

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Problems solved by technology

[0004] At present, the repair methods for fatigue cracks at the arc-shaped incision of the bridge diaphragm mainly include the crack hole method, the steel plate reinforcement method, and the crack welding method. Although the above methods have repaired or strengthened the damaged part of the crack, grinding is required on site. , drilling and welding operations, the construction process is relatively complicated, and the repair effect is highly dependent on the construction quality of grinding, welding, drilling, etc., the stability is difficult to guarantee, and secondary cracking is prone to occur at welds or bolt holes

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