Problem 1 A simply supported rectangular wooden beam has a span of 6 m. and carries a total uniform load of 25 kN/m including its own weight. The beam is made up of 50% stress grade Agoho. (Refer to table for the allowable stresses) a. If the beam width is 200mm and beam depth is 400 mm. What is the maximum flexural stress of the beam? Is it safe? b. What should be the area of the beam that will not exceed the allowable shearing stress? Species I. High Strength Group Agoho Liusin Malabayabas Manggachapui Molave Narig Sasalit Yakal Table TMBR-2: Properties of Philippine Wood at 50% Grade Modulus of Compression Parallel to Elasticity in Bending Grain Bending and Tension Parallel to Grain MPa 16.40 15.60 17.90 16.10 15.00 13.60 19.60 15-30 GPa 5-14 5.85 5.19 6.02 4.09 5.20 6.08 3.11 MPa 9.06 9.76 9.90 10.0 9.60 8.59 13-5 9-55 Compression Perpendicular to Grain MPa 3.69 2.69 5-44 3-77 3-96 3.11 6.40 3-92 Shear Parallel to Grain MPa 1.84 1.65 1.89 1.74 1.80 1.63 2.12 1.55

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Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.