Reinforcement structure of single-cable-plane cable-stayed bridge

Abstract

The invention relates to a reinforcement structure of a single-cable-plane cable-stayed bridge. The reinforcement structure is equipped with cantilever beams (7) which are symmetrically arranged on two sides of web plates of main beams (1) in front of and behind each bridge tower (3) and vertically extend outwards, wherein the distance between the cantilever beams (7) and a lateral vertical planepassing through the axial line of the bridge tower (3) is 1.1-1.2 times the width of the bridge floor; the distance between the extension ends of the cantilever beams (7) and the edge of the main beams (1) is 150-250 cm; shape memory alloy guy cables (5) are respectively anchored between the external end part of each cantilever beam (7) and the bridge tower (3) as well as a bridge pier (2); the distance between the anchoring point located between one shape memory alloy guy cable (5) and the bridge tower (3) and the upper surface of the main beam (1) is 1-3 times the width of the bridge floor;and the distance between the anchoring point located between the shape memory alloy guy cable (5) and the bridge pier (2) and the lower surface of the main beam (1) is 0.2-1 time the width of the bridge floor. The reinforcement structure provided by the invention can be used for effectively inhibit the torsional vibration of the main beams of the single-cable-plane cable-stayed bridge.

Description

technical field [0001] The invention relates to the reinforcing structure of the existing bridge, in particular to a reinforcing structure of the dynamic performance of the existing cable-stayed bridge. Background technique [0002] The bridge is a kind of permanent building. With the passage of time, the change of the environment and the increase of the traffic volume and the tonnage of the passing vehicles, the weak link of the original structure will appear. Therefore, in the prior art, in order to prolong the service life of the existing bridges and improve the performance, there are mainly two types of reinforcement schemes, one is the repair of structural damage, and the other is the reinforcement of stressed components. For example, the inventors One of the previously applied and authorized invention patent schemes with application numbers 200810219685.3 and 200810219686.8 belongs to the former, and the invention patent application scheme with publication number CN102...

AI Technical Summary

Problems solved by technology

It can be seen from the above description that the structure itself has the following deficiencies: under the action of partial loads caused by earthquakes, wind loads or automobiles, the bridge is prone to torsional vibration centered on the bridge axis, and the larger the bridge width, the greater the torsional vibration. The larger the range, it will affect both the driving comfort and the safety of the bridge itself.

Therefore, for single-cable-plane cable-stayed bridges, it is obviously difficult to solve the problem of torsional vibration if the scheme of reinforcing the stressed members is also used for reinforcement.

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