189 UNIT 8 ROOF TRUSSES Structure 8.1 Introduction Objectives 8.2 Roof Truss : Components and Definitions 8.3 Loads Acting on Roof Trusses 8.3.1 Dead Loads 8.3.2 Live Loads 8.3.3 Snow Loads 8.3.4 Loads Due to Rain 8.3.5 Wind Loads 8.3.6 Earthquake Loads 8.4 Design of Purlins 8.5 Design of Roof Trusses 8.5.1 Selection of the Truss Type 8.5.2 Analysis of Trusses 8.5.3 Design of Truss Members 8.5.4 Design of Joints 8.5.5 Design of Root Truss Bearings 8.6 Summary 8.7 Answers to SAQs 8.1 INTRODUCTION For covering large industrial or residential areas, to protect them against rain, sun, dust or other natural vagaries, we require roofing.
