| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 106 === Surrounding with oceans, Taiwan is located at the region where West Pacific Ocean tropical cyclone prevails over the whole area. The typhoon hit Taiwan at least 3 times a year,so wind can’t be ignored and pose a threat to daily life.In recemt year,thanks to the development of global economy and traffic, the population has increased year by year and limited land of the world, forcing the buildings of metropolitan area to grow upwards, such as Taipei 101 (510 meters), Khalifa (828 meters), Tokyo Skytree (634 meters) and other skyscraper was completed and opened, and now Saudi Arabia announces construction of a 1000-meter-high Jeddah Tower. It will become the first skyscraper standing 1000 meters in the world.The Council on Tall Buildings and Urban Habitat published The Tallest 20 in 2020, people will enter the Era of the Megatall. these materials of skyscrapers are mostly high strength and light weight, therefore, the impact will be more significant by the wind, so we must be attention to the comfort and security of living high-floor structure.
The current wind design specifications of Taiwan are based on the gradient height up to 500 meters, above the height, assuming the gradient wind speed to maintain a uniform velocity, however, the wind speed of real natural wind field is not maintained constant after reaching the gradient height, and it occurs shrink phenomenon or external expansion phenomenon. It is different from design specifications, besides, the classification of existing wind design specifications is only for conditions, without considering the natural factors and geographical factors of the wind field, it can’t be suitable for each metropolitan area.
Selecting single typhoon or maximum wind speed in most typhoon is the majority of the former sampling of the wind speed. This study is about using the wind speed higher than 10(m/s) of typhoons. Using the wind speed data of the Central Weather Bureau cast by radiosonde, this research includes the data of Banciao station and Hualien station for 2015 typhoon Dujuan、2016 typhoon Nepartak、typhoon Meranti、typhoon Malakas、typhoon Megi、typhoon Aere、2017 typhoon Nesat and typhoon Haitang. It can accurately obtain average wind speed profile’s parameters in Taiwan area by increasing the number of samples.The research results will help to provide more references for revising the wind design specifications of Taiwan in the future.
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