Week 2 Challenge

1. a) An=(b-ndh)t

=(260-2x22)x20

= 4320mm2

b)sectio A-D=260-(2X22)+0)X20 =4320MM2

SECTIONA-C-E-G=(260-(4X22)+1X60X60X5/4X60)X20=1940 MM2

c)section 1-2-3 =(200-12/2)-1x22 = 172mm

section 1-2-3-4 =2x(200-12/2)-2x22+60x60/4x90 = 354mm

2.a.gravity load on the purlin=560kg.

b.wind load -399 kg

3.a. factored load = 1.5x500=750 kn.

b) angle section required 750x1000/250/1.1=3300mm2.

isa 200x100x12= 3459 mm2.

c)strength due to yielding.=3459x250/1.1x1000 =786 kn.