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Structural Engineering and Mechanics Volume 63, Number 4, August25 2017 , pages 509-519 DOI: https://doi.org/10.12989/sem.2017.63.4.509 |
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Equivalent static wind loads analysis of tall television towers considering terrain factors of hilltops based on force measurement experiment |
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Shitang Ke, Hao Wang, Yaojun Ge, Lin Zhao and Shuyang Cao
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| Abstract | ||
| Wind field in mountainous regions demonstrates unique distribution characteristic as compared with the wind field of the flat area, wind load and wind effect are the key considerations in structural design of television towers situated in mountainous regions. The television tower to be constructed is located at the top of Xiushan Mountain in Nanjing, China. In order to investigate the impact of terrain factors of hilltops on wind loads, firstly a wind tunnel test was performed for the mountainous area within 800m from the television tower. Then the tower basal forces such as bending moments and shear strength were obtained based on high frequency force balance (HFFB) test. Based on the experiments, the improved method for determining the load combinations was applied to extract the response distribution patterns of foundation internal force and peak acceleration of the tower top, then the equivalent static wind loads were computed under different wind angles, load conditions and equivalent goals. The impact of terrain factors, damping ratio and equivalent goals on the wind load distribution of a television tower was discussed. Finally the equivalent static wind loads of the television tower under the 5 most adverse wind angles and 5 most adverse load conditions were computed. The experimental method, computations and research findings provide important references for the anti-wind design of high-rise structure built on hilltops. | ||
| Key Words | ||
| terrain factors of hilltops; television tower; high-frequency force balance; wind effect; equivalent static wind loads | ||
| Address | ||
| Shitang Kea and Hao Wang : College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China Yaojun Ge, Lin Zhao and Shuyang Cao : State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China | ||