9. CALCULATION EXAMPLES OF LVL STRUCTURES 9.2 LINTEL OVER A WINDOW OPENING Single span lintel beam over a window opening in a one family house is LVL 48 P beam 45x300 mm. Span length is L = 2300 mm and the lintel is carrying load from 5000m wide roof area. Support length is 150mm. Snow load sk is 2,75 kN/m2 and own weight of the structure is 1,0 kN/m2. Service class SC1. Beam properties: Bending strength edgewise fm,0,edge,k = 44 N/mm2 Shear strength edgewise fv,0,edge,k = 4,2 N/mm2 Compression perpendicular to grain edgewise fc,90,edge,k = 6 N/mm2 Modulus of elasticity E0,k = 11 600 N/mm2 Modulus of elasticity E0,mean = 13 800 N/mm2 Modulus of rigidity G0,edge,k = 600 N/mm2 Modulus of rigidity G0,edge,mean = 400 N/mm2 Area of cross section A = b∙h = 13500 mm2 Section modulus Wy = b∙h2/6 = 6,75∙105mm3 Moment of inertia Iy = b∙h3/12 = 1,01∙108 mm4 Moment of inertia Iz = h∙b3/12 = 2,28∙106 mm4 Torsion moment of inertia Itor = 0,3∙h∙b3 = 8,20∙106 mm4 Moment stiffness of the joist EIy = 13800 N/mm2 ∙ 1,01∙108 mm4 = 1,40∙1012 Nmm2 Shear rigidity of the joist GA = 600 N/mm2 ∙ 13500 mm2 = 8,10∙106 N Modification factor kmod for medium-term, SC1 = 0,8 Modification factor kdef for SC1 = 0,6 Material safety factor γM (default value in EC5) = 1,2 Size effect factor kh = (300/300)0,15 = 1,00 184 LVL Handbook Europe
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