kN

In case the design load had been calculated to be 1.25 kN/m2, the following procedure would have to be applied:

7 WORKED EXAMPLE STEEL TRUSS 1999

We assume the load as commended in this guide for an MCR roof: 1.0 kN/m2

7 WORKED EXAMPLE STEEL TRUSS 1999

Concentrated load ( "man load") due to foot traffic for fixing and maintenance, typically 0.8 kN.

2 PRINCIPLES OF ROOF TRUSS DESIGN 1999

In case the design load had been calculated to be 1.10 kN/m2, the following procedure would have to be applied:

5 WORKED EXAMPLE OF A TIMBER TRUSS 1999

· Single shear plane (kN) 0.25 0.35 0.45 0.55 0.70 0.85 1.0 1.3 1.5

4 TIMBER TRUSSES 1999

The steel truss samples presented in this manual are not heavier than 3 kN (300 kg) per individual truss.

2 PRINCIPLES OF ROOF TRUSS DESIGN 1999

Standard total load (as per given sample) = 1.00 kN/m2

2 PRINCIPLES OF ROOF TRUSS DESIGN 1999

For a typical slope of 30°, the increase in load per horizontal surface area is 15%; hence, an MCR roof would weigh 0.31 kN/m2 of area covered.

2 PRINCIPLES OF ROOF TRUSS DESIGN 1999

Snow load (according to climatic zones, typically 0.03 kN/m2 for each 10 mm of snow)

2 PRINCIPLES OF ROOF TRUSS DESIGN 1999

· Double shear plane (kN) 0.50 0.70 0.90 1.10 1.40 1.70 2.0 2.6

4 TIMBER TRUSSES 1999