The main roof truss of a resort is to be built using MGP12 grade seasoned radiata pine. The roof truss is shown in Figure 1.
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- DESIGN OF SINGLY REINFORCED BEAMA steel bar is attached to a wood support beam with four 22 mm diameter lag screws, as shown in the figure. The steel bar is 69-mm-wide by 8-mm-thick. For the steel bar, the yield strength is 235 MPa and the ultimate bearing strength is 350 MPa. The ultimate shear strength of the lag screws is 155 MPa. Factors of safety of 1.70 with respect to yield strength and 3.0 with respect to bearing strength are required for the bar. A factor of safety of 2.9 with respect to the ultimate shear strength is required for the lag screws. Determine the allowable load P that can be supported by this connection. (Note: Consider only the gross cross-sectional area of the bar-not the net area.) Support beam Answer: Pallow= 0000 P Steel bar KNQ3: Analysis the composite structure shown in figure. The beam CD has El=40000 kN.m². the member AB has EA BOOKN. T 30kN 3m D -3m -2m-
- A steel bar is attached to a wood support beam with four 21 mm diameter lag screws, as shown in the figure. The steel bar is 66-mm-wide by 9-mm-thick. The yield strength of the steel is 265 MPa and the ultimate bearing strength is 345 MPa. For the lag screws, the ultimate shear strength is 160 MPa. If a factor of safety of 1.85 with respect to yield strength, 3.5 with respect to bearing strength, and 2.8 with respect to shear strength is required, determine the allowable load P that can be supported by this connection. For the yield strength criterion, consider the constant cross-section part of the steel bar.A prestressed T beam shown which is reinforced with a bonded tendon having an area Aps = 1580 mm?, fc' = 34.5 MPa, fpu = 1862 MPa, and the effective stress after losses fse = 1102 MPa, fpy= 1713 MPa. Span of the beam is 6 m. %3! 1220 mm 0.85 fc 804 C NA 600 d-a/2 Aps 60 T=Ape fps 250 Find the live load that can be carry by the beam using USD load combination if the concrete's specific gravity is 2.4. (kN/m)What is the reference stress for bending about the Y -Y axis of a softwood glulam member from the24F-1.8E stress class?Fby= psi
- – A joint is made by gluing two plywood gussets of thickness t to wood boards.The tensile working stresses are 1200 psi for the plywood and 700 psi for the woodboards. The working shear stress of the glue is 50 psi. Determine the dimensions’ b and tso that the joint is as strong as the boards.Determine the minimum dimension a to the nearest mm of the beam's cross section safely support the load.The wood has an allowable normal stress of 10 MPa and an allowable shear stress of 1 MPa.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 shear
- The working stresses for the manufactured wood beam are 10 MPa in bending and 1.4 MPa in shear. Determine the largest allowable value of the load intensity wo. 25 mm Wo 25 mm - 250 mm 25 mm 3 m 6 m - 200 mmQ2 For the composite beam shown, find the moment of resistance of the beam when the maximum bending stress in the timber s (14 MPa). For steel (E = 200 GPa) and for wood (E = 10Gpa) 2 A 7 7 r*Problem2. The compression member is shown in figure. Find the following: a. The Euler stress Fe. b. The buckling stress Fcr c. The design strength d. The allowable strength e. Does the member satisfactorily meet the design requirements? Why? HSS 8x 8x4 ASTM AS00, Grade B steel (Fy = 46 ksi) 15'