Week 3 Challenge

1.braced frame and shear wall - effective length of column -0.65L

 unbraced frame with a pinned frame -1.0L

unbraced frame with a fixed base - 0.85 L

2.radius gyration of compound section -ryy -4.44 cm

b.kl =1.2 l=1.2 x3 =3600/44.4 =81 ans =149n /mm2 

c. ans 149 x 10426 =1553474n-mm2

3. a) area 400 x1000/120 =3333.33 mm2