Strengthening structure for fatigue cracked steel bridge deck

Abstract

The invention discloses a strengthening structure for a fatigue cracked steel bridge deck. According to the technical scheme, the strengthening structure is characterized by comprising the cracked steel bridge deck, carbon fiber reinforced battens, metal reinforced battens, shear connecting pieces, reinforcing meshes, an ultrahigh-performance concrete layer and a wearing layer. The carbon fiber reinforced battens are arranged on the cracked steel bridge deck; the shear force connecting pieces are welded to the metal reinforced battens; the metal reinforced battens with the shear force connecting pieces are arranged above the carbon fiber reinforced battens; the reinforcement meshes are placed on the cracked steel deck; the ultrahigh-performance concrete layer is poured on the cracked steelbridge deck; the carbon fiber reinforced battens, the metal reinforced battens, the shear force connecting pieces and the reinforcing meshes are arranged in a covering manner to be connected with thecracked steel bridge deck; and the wearing layer is arranged on the top face of the ultrahigh-performance concrete layer in a covering manner.

Description

technical field [0001] The invention relates to a bridge structure for reinforcing orthotropic steel bridge decks, in particular to a reinforcement structure for fatigue-cracked steel bridge decks. Background technique [0002] Since its inception, orthotropic steel decks have been favored by bridge designers for their light weight, large ultimate bearing capacity, quick construction, and beautiful shape, especially for long-span bridges. However, the local stiffness of the steel bridge deck is too low, and it is prone to fatigue cracking problems in long-term operation. The Guangdong Humen Bridge, which has been built in China, uses orthotropic steel bridge decks, and fatigue cracks appear during operation. In response to the above-mentioned diseases, various reinforcement schemes have been proposed, among which the patent "A Lightweight Composite Reinforcement Structure Without Repairing Fatigue-Cracked Steel Bridge Deck (Patent No.: ZL201721470446.6)" proposes spot weldi...

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Problems solved by technology

[0003] However, the patented technology still has the following problems: 1. The steel strips are spot welded to the cracked bridge deck, and cannot be tightly combined with the cracked bridge deck. There is a gap between the two, and there is a risk of corrosion. 2. The density of steel slats is relatively high, and using too many steel slats will increase the self-weight of the bridge and reduce the safety reserve of the bridge; 3. Welding a large number of studs on the cracked steel bridge deck will introduce welding residual stress. Risk of new cracks forming, further weakening the load-bearing capacity of steel bridge decks

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