Week 1 Challenge

1. N form truss is suitable for gravity load beacuse W form truss transfers the forces as shear forces and no bending moment transfers happen between two chords. But there is bending moment produced by graviity load so N form truss is suitable to transfers the gravity load.

4. Load on interior beam=

Tributary width= 1/2*(distance to adjacent beam on right)+1/2*(distance to adjacent beam on left)

=1/2*(2+2)

= 2 m,,

Tributary area = 2*8 square meter

Load on interior beam = tributary area * floor load

=16*10 = 160 KN/sqaure meter

Load on exterior beam

= tributary width= 1/2*(0+2) = 1 meter

= tributary area = 2*1 = 2 square meter

Load on exeterior baem = 2*10

=20 KN/square meter

There is no concerntration loads in the question so NO load acting on interior and exterior girder.

5. Given data

Initial length = 2000 m at temperature = -20 `celsious`

temperature= 40 `celsious`

Change in temperature = -20-(+40) = 60 celsious

`nbsp;Thermal expansion of steel = 12*10^-6 celsious`

Change in length △L= α*L*△T`

= 0.0000012*2000*60

= 0.144m

Total length = length at 20 degree celsious+ change in length

= 2000+0.144

= 2000.144 meters