耦合橋梁結構之等值靜力風載重

DEVELOPMENT AND WIND TUNNEL EXPERIMENTAL APPLICATION OF MULTI-HOLE TYPE DIRECTIONAL IRWIN WIND SENSOR

黃明慧(Ming-Hui Huang) ； 林堉溢(Yuh-Yi Lin) ； 傅仲麟(Chung-Lin Fu) ； 蔡明樹(Ming-Shu Tsai)

《中國土木水利工程學刊》 31卷8期 (2019/12) Pp. 711-719

https://doi.org/10.6652/JoCICHE.201912_31(8).0004

摘要

現代橋梁著重於美學設計，特殊幾何線型往往導致橋梁結構耦合特性更加顯著。常見的等值靜力風載重計算方式在共振部分大都不考慮振態間相關性，較不適用。本文旨在為耦合結構提供一合適的風載重計算方法。文章包含兩部分，第一部分介紹本研究所提出之靜力風載重計算方式，該方法以單一特定位置的位移極值反應為目標，是一基於散漫振動理論之率域方法，亦可方便的藉由顫振導數考慮橋梁之氣彈影響。第二部分為驗證部分，本文中依據結構耦合程度高低選定兩座橋梁結構做為分析案例，兩案例結果均顯示，本文所提出等值靜力風載重可以良好重現橋梁的動態極值位移反應。

關鍵字

橋梁 ； 等值靜力風載重 ； 結構耦合 ； 力學能

並列摘要

The special geometry makes structural coupling prominent because the appearance of modern bridges has become more complex due to the aesthetics design. Most of the traditional methods of equivalent static wind load are not suitable for this kind of structures because the modal correlation is ignored when dealing with the resonance parts. This study aims at developing an ideal way to calculate the equivalent static wind load for complex structures with significant structural coupling. The article consists of two parts, first part introduces the proposed theory of equivalent static wind load, which is, directed to the extreme displacement at a single specific degree of freedom. The method is an extension of the traditional bridge buffeting analysis so that the aero-elastic behavior can be taken into account by flutter derivatives if needed. And the second part is the verification that two bridges were selected as the examples, which is according to the level of structural coupling. Both results show that the equivalent static wind load calculated by proposed method, which is able to reproduce the dynamic extreme displacement of bridge perfectly.

並列關鍵字

bridge ； equivalent static wind load ； structural coupling ； mechanical energy