Iris Publishers- Journals of Civil Engineering

 Iris Publishers- Journals of Civil Engineering


Assessment of TC-Dominated Extreme Wind in the Scenario of Climate Change for Wind-Resistant Design of Super-Tall Buildings

There is a fast development of super-tall buildings during the last decades especially in coastal regions where tropical cyclone (TC) may attack frequently. Owing to their high flexibility, these structures become considerably sensitive to wind, and wind resistant performance has been involved as a critical aspect for the design, construction and maintenance of such civil structures. At TC-prone areas, information of TC wind offers a prerequisite for wind-resistant studies. Previous studies have shown that the greatest uncertainty source for wind-resistant design comes from inaccurate determination of wind information. Therefore, it is of great importance to quantify TC-wind characteristics as accurately as possible. However, wind-related items stipulated in many existing wind load codes/standards are established on the basis of wind measurements for non-TC events in the last century. Meanwhile, these items and many relevant studies account only for the lowest several hundred meters of the atmospheric-boundarylayer (ABL) whose depth has been increasing significantly above ever developing cities. Thus, they can hardly cater for the TCresistant design of super-tall buildings in the future whose heights should exceed one kilometer. Moreover, some detailed features of TC wind should be specially considered for the wind-resistant design of super-tall buildings, although they may be neglected acceptably for the cases of low-to-moderately-high buildings, such as the vertical variation of wind direction (also known as veering/ twisted wind) and air density. Results from field measurements demonstrate that within the ABL, the veering angle of TC wind can accumulate to 20°-45°,and the air density may decrease along height by a factor of ~10% He et al. [1,2]. There is another important issue which has been rarely investigated in the field of wind engineering, i.e., climate-change effect on TC activities and TC dominated extreme wind. It is undoubted that the surface temperature of the earth gets warmer than ever before.

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