Lecture 8 | Eurocode 5 Bending, Shear & Deflection Design of Timber Beams

In Lecture 8, we continue our introduction to timber (wood) structural design using Eurocode 5 and explore the key checks required for the design of timber beams. The lecture begins by explaining the difference between structural analysis and structural design, highlighting how structural analysis provides internal forces and stresses, while design codes provide the methods to determine member capacities. Key topics covered include: ✅ The role of Eurocode 5 in timber design ✅ Structural analysis vs structural design ✅ Bending stress distribution in timber beams ✅ Shear stress distribution and shear failure mechanisms ✅ Differences between timber and steel behavior ✅ Ultimate Limit State (ULS) design checks ✅ Timber bending resistance calculations ✅ Timber shear resistance calculations ✅ Serviceability Limit State (SLS) checks ✅ Deflection limits and code requirements ✅ Bending and shear contributions to timber beam deflection ✅ Creep effects and long-term deformation in timber structures ✅ Timber grades and material properties ✅ Strength parallel and perpendicular to grain ✅ Notched beams and shear reduction factors ✅ Practical timber beam design example By the end of this lecture, students will understand the three essential design checks for timber beams: Bending Capacity Shear Capacity Deflection (Serviceability) These concepts form the foundation of timber structural design and provide a practical application of the limit state design philosophy introduced earlier in the course. Timestamps 00:00 Introduction and recap of timber design 01:03 What does Eurocode 5 provide for timber design? 02:19 Structural analysis vs structural design 05:25 Bending stresses in beams 08:45 Introduction to shear design 11:36 Difference between bending and shear stresses 13:43 Shear cracks and failure mechanisms 15:56 Shear stress distribution in timber beams 20:04 Timber bending and shear design equations 24:30 Timber grades and material properties 25:32 Service classes, load duration and creep effects 27:58 Notched beams and shear capacity reduction 31:16 Timber types and engineered wood products 33:29 Serviceability and deflection requirements 36:42 Deflection limits in Eurocode 5 41:03 Timber beam design procedure 44:30 Timber material properties and grain direction effects 46:49 Modulus of elasticity of timber vs steel 48:28 Bending design example 49:46 Deflection calculations for timber beams 53:25 Long-term creep deflection 55:44 Shear design summary 56:28 Final design checks and conclusion Tags #StructuralEngineering #TimberDesign #WoodStructures #Eurocode5 #CivilEngineering #StructuralDesign #TimberEngineering #BeamDesign #EngineeringEducation #WoodEngineering #BuildingStructures #EngineeringLecture #ConstructionEngineering #LimitStateDesign #StructuralAnalysis #Deflection #ShearDesign #BendingDesign #EngineeringStudents #Eurocode