Vortex-induced vibration inhibiting device of steel trussed beam cable-stayed bridge

Abstract

The invention discloses a vortex-induced vibration inhibiting device of a steel trussed beam cable-stayed bridge, which aims to effectively inhabit the vortex-induced vibration of a steel trussed beam so as to satisfy the requirements of railways for driving safety and stability. The device comprises two columns of guide plates and installation components, wherein the two columns of guide plates are symmetrically arranged below the bottoms of steel trussed beam lower chords (10) at the left side and the right side, and the guide plates are fixedly connected with a steel trussed beam body through the installation components; and the two columns of guide plates comprise unit guide plates (20) which are arranged in sections and at intervals along the span direction of the bridge, and the plate surface of each unit guide plate (20) is provided with an inclination angle (delta) which is downwards deflected relative to the bottom surfaces of the steel trussed beam lower chords (10). The invention effectively, economically and conveniently solves the problem of the vortex-induced vibration of the steel trussed beam cable-stayed bridge, and the guide plates which are arranged in sections enable the vortex shedding frequencies of the adjacent beam sections to be inconsistent, thereby greatly reducing or completely inhibiting the vortex-induced vibration of the steel trussed beam, avoiding the safety problem caused by the vortex-induced vibration in the construction and the bridge completion processes of the steel trussed beam bridge and satisfying the requirement of the railways ondriving stability.

Description

technical field [0001] The invention relates to a vortex-induced vibration suppression device suitable for steel truss girder cable-stayed bridges. Background technique [0002] Cable-stayed bridge is the main type of long-span railway bridge. Many railway cable-stayed bridges have been built abroad, such as the road-rail cable-stayed bridge across the Oresund Strait in Denmark, with a main span of 490 meters; the heavy-duty railway cable-stayed bridge across the Sava River in Belgrade, Yugoslavia, with a span of 254m; Japan's second Senkugawa Railway Bridge, with a main span of 134m. There are not many independent large-span railway bridges in China. For example, the Hongshuihe Bridge on the Xianggui Line with a span of 96m is the first railway cable-stayed bridge in my country. The Wuhu Yangtze River Bridge (with a span of 312m ), Wuhan Tianxingzhou Yangtze River Bridge (main span 504 meters). [0003] Under the action of natural wind, the wind-induced vibration phenomen...

AI Technical Summary

Problems solved by technology

However, these measures are all aimed at box girders, and the research on the suppression of vortex-induced vibration of steel truss bridges is still blank.

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