A wooden beam is fabricated from one (2 x 10 in) and two (2 x 4 in) pieces of. dimension lumber to form the l-beam cross section shown in Figure. The flanges of the beam are fastened to the web with nails that can safely transmit a force of (120 Ib) in direct shear. If the beam is subjected to a shear force of (500 lb), determine the maximum spacing (s) (along the length of the beam) required for *.the nails. Use l = 748 in4

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12-42 The simply supported beam is built up from three boards by nailing them together as shown. The wood has an alkıwable shear stress of Ta = 15 MP, and an allowable bending stress of a= 9 MPa The nails are spaced at s= 75 mm, and cach has a shear strength of 15 kN Determine the maximum alkowable force Pthat can be applied to the beam. 100 mim 25 mm 25 mm- 200 mm mim

Problem 3: Method of Sections Inputs: ● ● h = 12 ft b = 7 ft F₁ = 2100 lb F₂ = 800 lb 0 = 25° You must use the method of sections as described below. You will not receive credit if you use the method of joints! Take a horizontal section cut through the middle of the truss and keep the top portion for your FBD. That way you don't have to bother with the reactions at A and D. Using the FBD of the top portion of the truss, perform the following steps: F₁ B a) Use EFX = 0 to compute BD. Indicate tension vs. compression. b) Use MD = 0 to compute AB. Indicate tension vs. compression. c) Use [MB = 0 to compute CD. Indicate tension vs. compression. d) Use [Fy = 0 to check all values D F₂

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The Howe truss is subjected to the loading shown in (Egure.11 Suppose that F-75 kN Figure 1of1 DAN Determine the force in member GP and state of the member is in tension or compression Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension. For Value Submit Part B μA O Bequest Answer Fco Value Part C Determine the force in member CD and state if the member is in tension or compression Express your answer to three significant figures and include the appropriate units. Enter negative value in t case of compression and positive value in the case of tension Submit Request A Units Units 2 Determine the force in member GC and state if the member is in lension or compression Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension Pearson G?

2 kN The beam is made of three boards nailed together to form the double-T cross section shown. If the allowable shear force in each nail is 400 N, determine (a) the absolute maximum shear stress in the wood, B (b) the required spacing s, of the nails between A and B, 2 m 1 m (c) the required spacing sy of the nails between B and C. -150 mm- T25 mm 200 mm 25 mm 25 mm

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1.8-12 A plane truss is subjected to loads 2P and P at joints B and C, respectively, as shown in the figure part a. The truss bars are made of two L102 x 76 x 6.4 steel angles [see Table F-5(b): cross-sectional area of the two angles, A = 2180 mm², figure part b] having an ultimate stress in tension equal to 390 MPa. The angles are con- nected to an 12 mm-thick gusset plate at C (figure part c) with 16-mm diameter rivets; assume each rivet transfers an equal share of the member force to the gusset plate. The ultimate stresses in shear and bearing for the rivet steel are 190 MPa and 550 MPa, respectively. Determine the allowable load Pallow if a safety factor of 2.5 is desired with respect to the ultimate load that can be carried. (Consider tension in the bars, shear in the riv- ets, bearing between the rivets and the bars, and also bear- ing between the rivets and the gusset plate. Disregard friction between the plates and the weight of the truss itself.)