A 50 mm x 100 mm purlin is used for a roof truss. Spacing of trusses is 3.5 m Weight of roofing sheets is 120 Pa Roof live load is 750 N/m² of roof area and ceiling load is 140 N/m² of roof area Spacing of purlins is 450 mm on centers. Inclination of the top chord is 30° from the horizontal The timber is 80% stress grade yakal. From table, E(yakal)=9780 MPa. Neglect the weight of purlins. 1. Which of the following most nearly gives the total vertical load, in N/m?

Two wood boards, each 18 mm thick, are joined by the glued finger joint shown. The finger joint will fail when the average shear stress in the glue reaches 1080 kPa. Determine the shortest allowable length d of the cuts if the joint is to withstand an axial load of P = 4.2 kN. Use a = 18 mm and b = 144 mm. d Glue b P P Answer: d = i mm

The rectangular doubly reinforcement stress concrete block with the arrangement of reinforcement of 2N28 bars on top and 3N28 bars on bottom. The modulus of elasticity are Ec =23,500MPa and Es = 200,000MPa. Dead load is 18KN/m and live load is 12KN/m. f'c = 25MPa 800 730 N12 ligs (fx.t-500MPa) Ast = 3N28 350 Span = 10m Figure 3 Use the Transformed section approach considering the presence of steel. Calculate the concrete area and transformed steel area in both tension and compression shown in Figure 3. n=Es/Ec Ast=1232mm^2 Use n-1 for the transformed area to do the calculate. Unit: mm^2 with two decimal