Vibration control device and method for a suspension bridge suspension cable

Abstract

The invention discloses a vibration control device and a vibration control method for slings of a suspension bridge. The vibration control device is arranged between the two abreast slings; one end of each sling is fixedly arranged on a main beam through a moving hinge; dampers are sequentially arranged along each sling; two ends of each damper are fixed with the corresponding sling through a sling clamp respectively. The vibration control method comprises the following steps: firstly, adjusting the frequency of one of the two abreast slings to achieve that the two slings are different in frequency; secondly, arranging a plurality of dampers between the two slings; finally, optimizing the mounting position of each damper according to the vibration mode control requirements of the slings. According to the device and the method, in-phase vibration generated by the double abreast slings is eliminated, and inverse phase vibration is restrained.

Description

technical field [0001] The invention relates to the technical field of vibration control of suspension bridge suspension cables, in particular to a vibration control device and method for suspension bridge suspension cables. Background technique [0002] The dead load and live load of the suspension bridge are transmitted to the main cable through the suspension cable, and then transmitted to the bridge tower and anchorage by the main cable, so the structural importance of the suspension cable is beyond doubt. Since the slings of modern suspension bridges are slender and flexible structures, their initial damping ratio is very small, and large vibrations are prone to occur under the action of wind load and traffic load. Long-term vibration of slings will cause fatigue damage to the steel wires at the anchor heads of the slings. The service life of the sling is greatly reduced. Generally speaking, the cable force and cable type of side-by-side double slings are the same, and...

AI Technical Summary

Problems solved by technology

It plays the role of rigid restraint when the double suspension cables vibrate in anti-phase, so that the free vibration length of the suspension cables becomes 1 / n of the original, and the frequency increases to n times of the original, which is beneficial to reduce the wind-induced vibration of the suspension cables. However, since the vibration damping frame does not produce energy dissipation, once the sling vibrates, the vibration will last for a long time and attenuate slowly, resulting in fatigue damage to the cable body, anchor head and vibration damping frame of the sling

[0004] In addition, there are some reports and applications of vibration control by dampers. Among them, the patent No. ZL201420222127.3 is a damping and vibration-reducing frame for slings. When multiple slings move together, the damping and vibration-reducing frame can provide certain Damping, but when the sling moves in the opposite phase mode, this damping shock mount is equivalent to a rigid shock mount and cannot provide damping and vibration reduction

The patent No. ZL201020161536.9 is a large-span suspension bridge suspender cable shock absorber, which uses a shock absorber to control the vibration of the suspension. High damping rubber, prone to aging and poor durability in harsh real bridge environments

Therefore, there is currently no vibration-damping structure that can simultaneously control in-phase vibration and anti-phase vibration

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