PART 1: COLUMN MEMBER COMPRESSION CHECKS

Q2. In assignment 3 we checked the section strength of the SG8 timber studs in the wall along gridline A, with nominal section size 100mm x 50mm (these are rough sawn dimensions and once dried, assume section size is 90mm x 45mm) for a ULS compression load due to 1.2G+1.5Q of N*= 21kN. Now member buckling needs to be checked (i.e. do the checks as per Chapter 3 of reader) noting that the stud height is 3m and blocking is provided at 1m centers, as shown in Figure 8. Report the critical (maximum) ratio of axial force demand to capacity. For the buckling in the out-of-plane wall direction, treat as “studs in light framing” (refer Table 3.1 of reader) whereas for other direction, assume that buckling is not a problem as the wall lining would laterally restrain the post buckling in the line of the wall.

Report the ratio of the axial force demand to capacity (as a %).