In this paper, according to the relative provisions of several important load codes/specifications in the world, estimation of the speed-up ratios of wind speed or wind pressure profile considering topographical effect has been discussed based on a practical important tall building being built on an island, and the effect of topography on the gust factor of wind speed has also been analyzed according to the related provisions of the new load code in Japan. Then, with an escarpment model and a ridge model, topographical effects on the estimated wind load for designing the main structural system and the maintenance components of this practical project were analyzed, respectively. Based on these investigations, the difference of the estimated values of the speed-up ratios due to topographical effect among these codes/specifications, including china load code, is presented, and the tendency in current revision of the corresponding provisions is discussed. The results can offer a convincible reference to wind load analysis in wind-resistant design for the practical tall building, as well as of other similar projects in the future.
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