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Research on Mechanism of Collapse by Aero-elastic Instability of a Tall Building

高层建筑气弹性失稳倒塌机理研究

基本信息

批准号：
12650586
负责人：
KAWAI Hiromasa
金额：
$ 2.11万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650586/
关键词：
Tall building Wind loads Aero-elatic instability Wind tunnel test Elastic-plastic behavior Vortex shedding Galloping Flutter 空力不安定振動

项目摘要

The objective of this research is to investigate the process of collapse of a tall building by occurrence of an aero-elastic instability like vortex induced vibration, galloping and torsional flutter. In order to achieve the objective, wind tunnel tests have been performed to investigate the dynamic behaviors of tall buildings in smooth and turbulent flows using conventional gimbals vibrating in locking modes. From the tests, the critical velocity of the instability and the response at the initial stage of the instability hardly affected by structural damping, but affected by mass of the building.The analytical model for predicting the above behavior of the instability has been developed by the assumption that any instability of buildings is accompanied by the vortex shedding at the early stage and the frequency of the vortex shedding can be determined by the effective width considering the amplitude of the vibration. The model can predict the various dynamic behaviors in the wind tunnel tests.The new device is developing in order to investigate the elastic-plastic behaviors of the building in the instability. The device can control the gimbals by giving the feed-back force to realize the elastic-plastic behaviors of the building in the system. By the comparison of the response of the instability between the new device and the conventional gimbals, the device can be used in the investigation of the elastic-plastic behaviors of the building.

本研究的目的是研究高层建筑因涡激振动、奔腾和扭转颤振等气动弹性不稳定性的发生而倒塌的过程。为了实现这一目标，我们使用传统的锁定模式振动万向节进行了风洞试验，以研究高层建筑在平滑和湍流中的动态行为。从试验来看，失稳的临界速度和失稳初期的响应几乎不受结构阻尼的影响，而是受建筑物质量的影响。假设建筑物的任何失稳都伴随着早期的涡旋脱落，涡旋脱落的频率可以通过考虑涡旋振幅的有效宽度来确定，从而建立了预测上述失稳行为的分析模型。振动。该模型可以预测风洞试验中的各种动态行为。正在开发的新装置是为了研究建筑物在不稳定状态下的弹塑性行为。该装置通过给出反馈力来控制万向架，实现系统中建筑物的弹塑性行为。通过比较新装置与传统万向节的不稳定性响应，该装置可用于建筑物弹塑性行为的研究。