Steel Lattice Girder Roof

For span up to about 20 00 m the spacing of steel trusses is likely to be about 4 00m i e.

Steel lattice girder roof.

For spans of up to 20 m it is sufficient to use angles tees and lighter hollow sections. Geotec lattice girder systems are lightweight three dimensional curved steel frames which are composed of main bars secondary bars connection plates foot plates and stiffeners. However for flatter roof pitches lattice girders with a sloping top chord can also be used efficiently. The main uses are.

For very long spans uc or heavier hollow sections may be required. The lattice girder was used prior to the development of larger rolled steel plates. Lattice girder an immediate roof support for tunneling systems. Trusses are frequently used to span long lengths in the place of solid web girders and such trusses are also referred to as lattice girders.

The lattice girder can provide immediate support for tunneling environments. For economic spacing of roof trusses the cost of truss should be equal to twice the cost of purlins the cost of roof covering. We deliver our solutions alongside a complete range of support services that are delivered by industry experts and backed by a combined 200 years of experience. It has been supplanted in modern construction with welded or bolted plate girders which use more material but have lower fabrication and maintenance costs.

This means that the axial forces in these members due to loading on the vertical truss and those due to loads on the wind girder loading must be added together for an. The belfast truss is a cross between the town s lattice truss and the bowstring truss it was developed in ireland as a wide span shallow rise roof truss for industrial structures. Steel members subjected to axial forces are generally more efficient than members in flexure since the cross section is nearly uniformly stressed. A slope of 22ø degree is common for corrugated steel and asbestos roofing sheets.

Space frame is formed when the members lie in three dimensions. The truss or lattice girder is a triangulated framework of members where loads in the plane of the truss or girder are resisted by axial forces in the individual members. The terms are generally applied to the planar truss. Mctear co of belfast ireland began fabricating these trusses in wood starting around 1866 by 1899 spans of 24 metres 79 ft had been achieved and in the 20th century shipyards and airplane hangars demanded.

Lattice girders are generally associated with long span beams in which the top and bottom chords are usually horizontal. Our lightweight quality products include long span steel beams roof beams floor beams green roof systems cantilevers and a wide choice of lattice beam systems.