Some Modification on the High-Rise Building''s Design Wind Load

• Main Authors: Chiang, Kuang-Chin, 姜光晋
• Other Authors: Cheng, Chii-Ming
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/04723682392257614773

碩士 === 淡江大學 === 土木工程學系 === 92 === For high-rise buildings, wind force is an important lateral design loading besides earthquake force. Especially for flexible and dynamically sensitive structure, wind effects are likely to be the dominant factor on buildings’ lateral design loading. Due to the lower structural frequencies, flexible structures are more likely to be resonated with dynamic wind loads that exerted on tall buildings, and resulted in an even higher buildings’ design wind load. Therefore, it’s necessary for structural engineering to evaluate buildings’ design wind load with care. The wind load provisions of major countries’ builidng codes have been gone through several upgrading in the last two decades. With the progress of the late wind engineering researches, there could be a few more modifications on those wind codes.This paper conducted studies mainly on the Taiwan wind code, discussing the inadequacy in the current wind load provisions and proposing revisions. Most standards of major countries use Gust Loading Factor Method to evaluate the alongwind design wind load. But this calculation procedure has some illogicalities, especially in the spatial distribution of wind load. In this paper, the alongwind load is decomposed into three parts: the mean, background and resonant components, each part evaluated individually and then combined. The spatial distribution of each part is addressed separately. The acrosswind design wind load is mainly induced by vortex shedding in the wake of building. The acrosswind design wind load is also decomosed in to three parts and treated similar to the alongwind design wind load for the uniformity in the wind code. Two prototype buildings were use to compare the design wind load based on the proposed modification model and the current Taiwan wind code, buildings’ design wind loads were also calculated based on the wind tunnel data for reference. The proposed model produces better results than the current wind code, especially on the wind load distribution.