Analysis of Design Wind Speed Variation above the Gradient Height for Large City Terrain (III)

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Project title

Code/計畫編號

MOST103-2221-E019-008

Translated Name/計畫中文名

都會地況設計風速於梯度高度以上風速變化情形之探討(III)

Project Coordinator/計畫主持人

Jing-Jong Jang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=8356319

Year

2014

Start date/計畫起

01-08-2014

Expected Completion/計畫迄

01-07-2015

Bugetid/研究經費

478千元

ResearchField/研究領域

土木水利工程

"近幾年來拜現代建築技術發達及都市經濟發展迅速所賜，全球各大都會區建築平均高度不停向上增長，日本東京晴空塔(634m)、杜拜哈里發塔(828m)、美國世貿一號大樓(541m)等超高樓層結構物接連完工啟用，此類型建築物已成為都會發展之趨勢，然而超高樓層之結構物大多為高強度及輕質量材質，受到風力之影響更鉅，須更審慎評估風力對超高樓層之結構物的安全性及舒適性威脅。然而，台灣現行風力設計規範所訂定的設計風壓與梯度高度只到500 m 且假設在此高度以上風速採垂直分佈，但實際上，真實自然風場的風速在到達梯度高度以後並非保持等速，而是可能產生內縮或外擴現象，故現行風力設計規範實不符合真實現象。此外，現行風力設計規範僅對地況有所分類，並未考慮整體地理因素所造成的風場影響，亦不能完美的適用於各大都會區。本研究藉由中央氣象局所釋放探空氣球所得之數據，分別板橋測站及花蓮測站之全年數據、秋季風數據、2014年颱風數據，並整合前人研究數據加以比對分析與研究，推求適用於臺灣不同地區的 α 值以及 Z_g 值，預期研究成果將有助於未來高樓結構耐風安全設計的完善。 " "Taiwan locate in the west Pacific Ocean subtropics area where typhoons prevails over the whole area frequently, The impact of wind is too important to be ignored in daily life. In recent years, with the development of modern city, the high floors buildings are completed one by one, such as the Taipai 101 (510m), Khalifa tower (828m), Tokyo Skytree (634m), Makkah Royal Clock Tower Hotel (601m). Above these kind of buildings tend to take light weight and high-strength material, which is more sensitive on the wind pressure force. Therefore, the in-depth knowledge of wind speed profile of Taiwan is a serious need. The current wind design specifications of Taiwan are based on a study of wind speed profile of Taiwan. However, the study didn’t compare the difference between cities with different geographical conditions. In this study, using the wing speed data of the Central Weather Bureau cast by radiosonde to analysis and find the coefficient of α and Z_g in different metro area. In order to provide a reference for specification revisions in the future. "

Keyword(s)

風速剖面
耐風設計
梯度高度
都會地況
wind speed profile
wind resistant design
gradient height
urban terrain

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Analysis of Design Wind Speed Variation above the Gradient Height for Large City Terrain (III)

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