CASE STUDY OF WIND-RESISTANT DESIGN AND ANALYSIS OF HIGH MAST STRUCTURES BASED ON DIFFERENT WIND CODES

The high mast structure (HMS) has the characters of light weight and high cost efficiency. Therefore, it is widely used in the modern construction industry. It has a large the ratio of height (H) to least horizontal dimension (D) that makes it a particularly more slender and wind-sensitive than any other structures. Therefore, the purpose of this research is to develop the wind-resistant design (WRD) procedure for the slender, tapered support structures of HMS subjected to wind-induced excitation from vortex shedding and gust buffeting. This paper illustrates the theoretical basis and the analytical development of the WRD; including calculating gust effect factor (GEF) in along-wind respond; lock-in and galloping effects in across-wind respond. The finite element program is used to analyze the natural period and displacement of HMS in this study. The results of this research highlight the following three parts. First, it is a good verification that natural periods of one second can be used in the discrimination of to rigidity and flexible structure in gust effect factor (GEF) analysis procedure for HMS. Second, the across-wind displacement of HMS should be considered in analysis for WRD procedure. Third, the wind-induced vibration and instability behaviors can be avoided by controlling the critical wind velocity in WRD procedure.