PART 1: COLUMN MEMBER COMPRESSION CHECKS

 Q1. Do calculations to check whether the 6.5m long columns on grid B5 (shown as a post in Figure 7), with nominal section size 250 x 50mm (these are rough sawn dimensions and once dried, assume section size is 240mm x 45mm) are able to sustain a ULS compression load due to 1.2G+1.5Q of N*= 30kN. Assume that the timber is SG8 and note that both the section strength and member buckling needs to be checked (i.e. do the checks as per Chapter 3 of reader). Report the ratio of demand to capacity. For the column end restraint conditions, assume that for buckling in the major axis direction (i.e. that involves major-axis bending), the foundation provides restraint in position only and the roof level restrains the top of the column in position only too. For buckling in the minor-axis direction (i.e. that involves minor-axis bending), note that the wall girts shown in Figure 7 act as positional restraints. Report the axial force demand to capacity ratio (as a %) for both the major- and minor-axis directions.

Q1a. What is the axial force demands to capacity ratio (as a %) for the major-axis direction. [%]