A Study on the Wind Resisting Capacity of Traditional Roofing System

Abstract

Widespread and repeated failures of roof systems due to windstorms have become a frequent occurrence in Bhutan. Records show that traditional roofing systems are the most and worst affected structures. The research aims to determine the reasons for the poor performance of the traditional roofing system and explore measures for improvement. The study is focused on two of the most common traditional roofing systems: the Drangmik roof and the Janthok roof. The capacity of these roofs for wind loading as per the prevailing codal requirement will be assessed. For a more conservative analysis, a basic wind speed of 47 m/s is considered, and the resultant pressure acting on the roofs is determined. The adequacy of the member sections and joineries of this system will also be assessed. Mitigation measures, both passive (non-intrusive) and active (intrusive) in nature, to improve the performance and protect the roof system from the harmful effects of wind load are proposed.