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Study on Suspension Type Bridges Multi-Strand Cable with Economical and Aerodynamic Performances

悬索式桥梁经济气动多股缆索研究

基本信息

批准号：
12555137
负责人：
KUBO Yoshinobu
金额：
$ 4.74万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The present study aims at the development of multi-strand cable for a long suspension type bridge from viewpoint of both economical and aerodynamic performances. Stay cables of cable-stayed bridges and hanger cables of suspension bridges are known to have various types of vibration under wind action. In order to suppress the aerodynamic vibrations, many researches have been conducted. In the present study, multi-strand cable with helical wire is proposed from viewpoint of aerodynamic stability and of cost performance of manufacture, transportation and erection. The multi-strand cable is composed of small strands, therefore adding to the manufacturing small strands in the factory, small capacity is needed for transportation and erection devices regardless of required cable capacity. The outer shape of the multi-strand cable is uneven and the shape gives good performance to suppress the aerodynamic vibrations such as vortex-excited vibration and rain-wind-induced vibration. The experiments were conducted in the wind tunnel with test section 1780 x 790 mm of Kyshu Institute of Technology. The models used in the experiments were rigid models made by the aluminum pipe. And the model was elastically supported in heaving motion by four coil-springs. The observation of response and measuring surface pressure were conducted. It was clarified by measuring surface pressure of the cable that the multi-strand cable with helical wire can suppress the various aerodynamic vibrations. The mechanism of suppressing aerodynamic vibrations is seemed that the gap between grooves on multi-strand and helical wire makes the surface pressure appropriately smooth for suppressing vibrations.

本研究旨在从经济性与空气动力性能的观点出发，开发长悬索桥用多股缆索。众所周知，斜拉桥的斜拉索和悬索桥的吊索在风的作用下会产生各种形式的振动。为了抑制气动振动，已经进行了许多研究。本文从空气动力稳定性和制造、运输、安装的经济性角度出发，提出了多股螺旋钢丝缆索。多股电缆由小股组成，因此在工厂中添加制造小股，无论所需的电缆容量如何，运输和架设设备所需的容量都很小。多股电缆的外形是不均匀的，并且该形状提供了良好的性能来抑制空气动力学振动，例如涡激振动和风雨诱发振动。实验在Kyshu Institute of Technology的风洞中进行，试验段为1780 x 790 mm。实验中所用的模型是由铝管制成的刚性模型。模型在垂荡运动中由四个螺旋弹簧弹性支撑。进行了响应观测和表面压力测量。通过对拉索表面压力的测量，证实了螺旋钢丝多股拉索能够有效地抑制各种气动振动。抑制空气动力振动的机理似乎是多股线和螺旋线上的凹槽之间的差距使得表面压力适当地平滑以抑制振动。