Investigation on wind tunnel experiment of oval-shaped arch-supported membrane structures

Abstract

This paper presents wind pressure distribution characteristics of oval-shaped arch-supported membrane structures based on the wind tunnel experiments. Distribution of mean and fluctuating wind pressure coefficient is presented meticulously using pressure maps. Influence of different factors including rise-span ratio, wind direction, and terrain category, on the distribution of mean, fluctuating and peak wind pressure coefficient is discussed. Both enclosed and open structures are considered. Results show that structure experiences critical suction pressure at immediate downslope of arch axis under oblique wind direction. The significant influence of rise-span ratio and wind direction on the distribution of mean and peak wind pressure coefficient is observed. Variations of wind pressure coefficient, due to change in key parameters, are distinct in windward area but changes are insignificant in leeward area. Relatively larger area of roof of open structure is loaded with positive wind pressure coefficient, as compared to an enclosed roof. Moreover, clustering analysis is performed to divide the roof surface into different zones, then mean and peak wind pressure coefficient are proposed for corresponding zones of roof surface considering different rise-span ratios under different wind directions. The outcomes are expected to be useful to engineers and researchers to understand similar type of structures.