Sectional dimensions of story steel structure housing the roof purlins is how provisions?

Sectional dimension story steel structure roof purlins should follow to purlin section height, width, size of the selection requirements.

1. The section height h

Sectional solid abdominal purlin high h, typically span of 1 / 35-1 / 50; sectional truss purlin height h, typically span of 1 / 12-1 / 20.

2. The cross-sectional width b

Sectional solid abdominal purlin width b, the cross-section height h chosen to determine the specifications of steel; space truss purlin winding total width b, taking the total height of the cross-section of 1 / 1.5-1 / 2.0.

Section 3. Inter chord truss purlin length and the webs

Chord panel length truss purlins. According winding moment value is determined by calculation; the general desirability of inter-section under a tensile rod length 400-800mm webs of manufacturing conditions and the size of the force, continuous bent round the whole of serpentine or curved segments. fold v-shaped, w-shaped bar. Angle oblique web members and chords of 40 ° -60 ° when the load is large. Webs can be used angle.