A simply supported timber beam spans 4.2 m and supports a floor system with a total dead load of
1.8k(N)/(m)
and a live load of
2.5k(N)/(m)
. The beam is spaced at 600 mm intervals and is made of SG3, dry timber. a) Calculate the design moment and shear force. (5 marks) b) Design the beam cross-section to satisfy bending strength. Hand-draw the beam crosssection with dimensions, labelling all key properties. (10 marks) c) If the beam spacing increases to 750 mm , recalculate the bending stress and propose a modification to maintain structural performance. (5 marks) (CLO2-PLO3:C5)8