The principal rafter of roof truss is inclined at an angle of 15°. No access is provided except maintenance. The roof is subjected to imposed load of 0.75 kN/m2, the design imposed load is

1
1.50 kN/m2
2
0.75 kN/m2
3
0.65 kN/m2
4
0.40 kN/m2

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