Show calculations for the section properties of a 2 x 8 sawn lumber member. Use stan- dard net sizes for dressed (S4S) lumber, and verify the section properties in NDS Table 1B.
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- Q#1: Differentiate between the following: One way beam supported Slab & One way Joist Slab Subject: RCD 2Determine the largest axial force P that can be carried safely by the rectangular wood panel if the working stress for the wood is 1120 psi, and the normal and shear stresses in the glue are limited to 700 psi and 450 psi, respectively and the angle of seam is 30-degree with respect to the horizontal, 1.0 in 4 in 30 Match each item to a choice: PMAXSIZED-BOND PAPER. 1. A center-point bending test was performed on a 2 in x 4 in wood lumber according to ASTM D198 procedure with a span of 4 ft. and the 4 in side is positioned vertically. If the maximum load was 240 kips and the corresponding deflection at the mid-span was 2 in, calculate the modulus of rupture and the apparent modulus of elasticity
- Required information A composite beam is made by attaching the timber and steel portions shown with bolts of 12-mm diameter spaced longitudinally every 200 mm. The modulus of elasticity is 10 GPa for the wood and 200 GPa for the steel. The vertical shear is 4.4 kN. 12 mm 250 mm 12 mm 150 mm- Determine the average shearing stress in the bolts. (Round the final answers to two decimal places.) The average shearing stress in the bolts is MPa.A center-point bending test was performed on a 2 * 4 wood lumberaccording to ASTM D198 procedure with a span of 4 ft and the 4 in. sideis positioned vertically. If the maximum load was 240 kips and the corre-sponding deflection at the mid-span was 2.4 in., calculate the modulus ofrupture and the apparent modulus of elasticity. See Experiment No. 30 forequations.11-1. Determine whether the W14 x 34 beam shown in Figure 11-43 is adequate for flexural rupture and flexural yielding at the cope. The steel is ASTM A992, grade 50. 1/½/2" 4" W14x34 R₁ = 40kips FIGURE 11-43 Detail for Exercise 11-1
- The built-up beam wooden above is subjected to a horizontal shear force, V, as shown. Assume that the beam dimensions are drawn to scale. Also assume that the nails attaching the three pieces of the cross-section allow it to act as a single member. Which of the following best explains why we cannot analyze the shear stresses in this beam with the techniques covered in this class (at least, so far)? The shear force is not "transverse" O Wood cannot be loaded perpendicular to the grain The shear force is not acting along a line of symmetry of the cross-section We can only deal with vertical shear forcesIf the timber section is made from Kamagong (80% VSG), what are the following reference design values? (a) Reference Bending Design Value, Fb (b) Reference Tensile Design Value (Parallel to Grain), Ft (c) Reference Shear Design Value (Parallel to Grain), Fv (d) Reference Compressive Design Value (Parallel to Grain), F. (e) Reference Compressive Design Value (Perpendicular to Grain), FCL (f) Reference Modulus of Elasticity, EThe two pieces of wood, 2.94in. by 4.76 in., are glued together along the 48ᴼjoint. Determine the maximum safe axial load P (in lb) that can be applied if the shear stress in the glue is limited to 275 psi. Round off the final answer to three decimal places.
- Determine the largest safe value of the load intensity w0 carried by the Ibeam if the working stresses are 3500 psi in bending and 260 psi in shear The wood beam has a square cross section. Find the smallest allowable cross-sectional dimensions if the working stresses are 8 MPa in bending and 1.0 MPa in shearP01 : What does the grade stamp on the lumber identifies? a. Species of lumber b. The mill that produced the piece c. Inspection agency d. Moisture content at the time of surfacing e. Dimension of the lumbar f. All of the above P02: A 4x16 (green) DF-L swan timber beam and a 3.5x15 DF glulam beam are considered for use in a structure with an expected moisture contnet of 10%. Find the expected shrinkage of each membeer through the depth assumiong the initial moisture content is 30% for the swan lumber and 14% for the glulam.Calculate the maximum allowable load that a nominal 203.2x 203.2 mm (8”x8”) sawn lumber column, 4.0m long, can carry. The applied loading is for 20-year duration and the wood used is visually graded sawn Apitong (E = 7.31 GPa, Fc = 9.56 MPa). The column is both pin at ends. Consider actual size of 7.25”x 7.25” and CD = 1.0.