The effects of Turbulent Boundary Layer on high-rise building’s design wind load

• Main Authors: Hsien-Fu Chen, 陳信甫
• Other Authors: Chii-Ming Cheng
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/98914086204457156999

碩士 === 淡江大學 === 土木工程學系 === 91 === High-rise building plays a important role in development city under the finite land. Wind force is an important lateral design load other than earthquake force for high-rise buildings. At present, building code tends to adopt quasi-static approach, and can not represent the complex random nature of wind load. So, high-rise buildings’ wind tunnel experiment is a better method to estimate the wind load. This paper is to study the effect fo flow field on design wind load. Four types of turbulent boundary layers were generated in wind tunnel to represent flow fields developed over different terrains, namely, coastal area, open land, suburban area and large city. Two goupes of building models were tested in these flow fields: (1) sqaure shaped model with different aspect ratio, (2) different geometric cross-section. Force balance technique was used to aquire the wind loads and then the design wind load at each floor were calculate through dynamic anaylsis. Based on the wind tunnel measurements, empirical models to consider the influence of terrain on design wind load were derived. The experimental results indicate that, coastal terrain has higher mean wind velocity and city has greater turbulent intensity. Most models have less design wind load in city flow field. The predicted design wind load based on the empirical model agrees reasonably with the experimental data.