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• Q2: Assessment task 3: Timber design- Design of a bolted truss connection An exposed roof truss is to be fabricated from kiln-dried Blackbutt for a restaurant in Bathurst, NSW. A sketch of the truss geometry is shown in Figure below. The truss is one of a number of trusses supporting 20 m² of roof that will be fabricated from stained seasoned hardwood and connected with galvanised bolts. The architect is keen to express the structural form. An analysis of connection load cases indicates that the critical loads for the strength limit state will be the construction imposed load combination: Nominal permanent load G = 9 KN axial compression in the top chord and Nominal imposed load Q = 9 KN (with a duration of load of 5 days) axial compression in the top chord Using 140 x 45 mm timber for the top chord and two 140 x 35 mm pieces for the bottom chord, design a bolted heel connection using M12 bolts. (The heel connection is at the junction of the top chord and the bottom chord (see Figure (a) below) and is supported by the wall top plate.) Inclined member, top chord Heel joint Horizontal member - bottom chord - 2 x 140 x 35 (a) Roof truss Inclined member, top chord Bolt force 30 Design load in top chord Horizontal member, bottom chord (c) Forces on connection Inclined member, top chord, 140 x 45 Horizontal member, bottom chord - 2 x 140 x 35 (b) Detail of connectionSee Answer
• Q3: Assessment task 3: Timber design- Design of a bolted truss connection An exposed roof truss is to be fabricated from kiln-dried Blackbutt for a restaurant in Bathurst, NSW. A sketch of the truss geometry is shown in Figure below. The truss is one of a number of trusses supporting 20 m² of roof that will be fabricated from stained seasoned hardwood and connected with galvanised bolts. The architect is keen to express the structural form. An analysis of connection load cases indicates that the critical loads for the strength limit state will be the construction imposed load combination: Nominal permanent load G = 9 KN axial compression in the top chord and Nominal imposed load Q = 9 KN (with a duration of load of 5 days) axial compression in the top chord Using 140 x 45 mm timber for the top chord and two 140 x 35 mm pieces for the bottom chord, design a bolted heel connection using M12 bolts. (The heel connection is at the junction of the top chord and the bottom chord (see Figure (a) below) and is supported by the wall top plate.) Inclined member, top chord Heel joint Horizontal member - bottom chord - 2 x 140 x 35 (a) Roof truss Inclined member, top chord Bolt force 30 Design load in top chord Horizontal member, bottom chord (c) Forces on connection Inclined member, top chord, 140 x 45 Horizontal member, bottom chord - 2 x 140 x 35 (b) Detail of connectionSee Answer
• Q4: FIBROUS STRUCTURES ASSIGNMEMT 6x6 col. 2x12@4'-0"- O.C., typ. douglas fir larch sel. struct. -2x12@4'-0" O.C., typ. Calculate the span 2. Calculate the beam bending moment. Le=, RB= 3. Provide all the load factors. 4. What is the Bending Stress? Is this acceptable? 5. What is the Shear Stress? Is this acceptable? 6. What is the total deflection? Is this acceptable? 7. What is the live load deflection? Is this acceptable? 8. What is the bearing stress? Is this acceptable? PARTIAL PLAN FLOOR SECTION 6x6 col. A 20 foot long 6 x 12 beam supports floor joists in the interior of a residence spaced every 8 feet. Assume the DL=10 psf, LL=40 psf 1.See Answer
• Q5:A 20 foot long 6 x 12 beam supports floor joists in the interior of a residence spaced every 8 feet. Assume the DL=10 psf, LL=40 psf 1. Calculate the span. 2.Calculate the beam bending moment. Le=, RB= 3 Provide all the load factors. 4. What is the Bending Stress? Is this acceptable? 5.What is the Shear Stress? Is this acceptable? 6. What is the total deflection? Is this acceptable? 7. What is the live load deflection? Is this acceptable? 8. What is the bearing stress? Is this acceptable? See Answer

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