Q2. Do calculations to establish what is the permanent action (dead load), G, you should use for design of the pair of main floor beams shown in Figure 5 (the beams are located mid-way between gridlines 1 and 2 and span between timber columns on gridlines A and B1). The main beams consist of two solid timber beams, coupled together with blocking (of negligible weight) to act as a single beam element. Assume that we will use pairs of 300mm x 75mm sawn timber (NZ pine) sections for the main beams, 140mm apart.  Note the information regarding floor loads defined in question 1 is also relevant to this question because the gravity loads can be assumed to be distributed evenly onto the beam by the joists. Combine all dead load contributions and compute a uniformly distributed line load, wG (in kN/m), acting on the pair of main beams.

a) What is the dead load contributed from the beam self-weight? [kN/m] [3 d.p]

c) What is the total dead load acting on the joists? [kN/m] [3 d.p]

b) What is the dead load contributed from other superimposed loads, such as floor, ceiling, and services? [kN/m] [3 d.p]

Q1. Do calculations to establish what is the permanent action (dead load), G, you should use for design of the floor joists. Floor joists are spaced at 300 mm centres and consist of 300mm x 50mm sawn timber (NZ pine) sections (note that Appendix A1 of NZS1170.1 has unit densities of different materials). The mezzanine floor area has 25mm pine plywood screwed on top of the floor joists that can be assumed to weigh 16.2kg/m2 (as per Table 4A of the Ecoply brochure available at (https://chhply.co.nz/assets/Uploads/EcoplySpecificationInstallationGuideCurrent.pdf). There is a 10mm plasterboard (fibrous plaster) ceiling screwed to the underside of the floor joists. Insulation and services within the floor structure can be assumed to add 0.1kPa to the floor dead load. Combine all dead load contributions and compute a uniformly distributed line load, wG (in kN/m), representing the dead load acting on the joists.

a) What is the dead load contributed from joist self-weight? [kN/m] [3 d.p]

Q12. Considering the wind load case W2 acting on the Eastern wall of the building, what should be the tributary width to consider for wind loading of the wall girts? [m]

Q13. Considering the wind load case W2 acting on the Eastern wall of the building, what should be the tributary width to consider for wind loading of the wall posts? [m]

Q10. For the “pair of main timber beams” at mezzanine level, spanning between the columns on grids A and B1, what should be the tributary width to consider for gravity loading? [m]

Q11. Assuming the floor joists at the mezzanine floor are spaced at 300mm centres, what should be the tributary width to consider for gravity loading of the floor joists? [m]

Q6. Considering gravity load on the mezzanine floor, what is the tributary area for the timber column on gridline A, located halfway between gridlines 1 and 2 (refer Figure 5)? [m²]

Q8. Considering gravity load on the roof, what is the tributary area for the steel portal column located at the intersection of grid 2 and grid E? (You can approximate the roof as being flat for this area calculation). [m²]