As for the wind resistance design for building structures on hilly terrains, the fundamental issue is to
establish the wind topographic acceleration effect. Since the hill slope plays an important role in the wind flow around
hilly terrains, its influence on the wind topographic acceleration effect needs further investigation. In this study, the
large eddy simulation (LES) was carried out to study the influence of slope variation on the wind topographic
acceleration effect around a three-dimensional hill. The results indicate that the hill slope significantly affects the
distribution of the wind topographic acceleration effect over the hill. The coverage of the wind topographic acceleration
effect increases with the slope increase. At the hill windward, the mean wind topographic acceleration effect is
suppressed with the increasing slope and reaches its maximum at the hilltop, while it shows the opposite for the
fluctuating counterpart. On the hill leeward, the mean wind topographic acceleration effect gradually reduces with the
increase of slope. Moreover, a critical slope of 25° for the fluctuating wind topographic acceleration effect can be found
near the hill surface on the leeward side. The fluctuating wind topographic reduces with the slope increase when α
25°, while exhibits an opposite trend when 25° > 25°. A mathematical model, which incorporates the slope, height and
topographic influence factors, was then proposed to depict the distribution of the mean and fluctuating wind
topographic acceleration effect coefficients. Compared to different national load codes, the proposed model presents a
good performance not only in predicting the mean wind topographic acceleration effect, but also in possessing the
capability in the prediction of the fluctuating wind topographic acceleration effect.
Key Words
Wind topographic acceleration effect; Large eddy simulation; Three-dimensional hill;
Mathematical model; Hill slopes
Address
Liang Li — School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China
Deqian Zheng — School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China Guixiang Chen:School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China Wenyong Ma:Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Pingzhi Fang — Asia-Pacific Typhoon Collaborative Research Center, Shanghai 201306, China
PDF Viewer
Preview is limited to the first 3 pages. Sign in to access the full PDF.
