The following pictures were taken from a site that is undertaking a redevelopment. The original structure was a storage facility, constructed using a steel portal frame system. The frames are the only remaining part of the original structure, which allows for a close up look at the portal frame system, which spans a distance of approx 60m.
The below images show the knee joint connection between the stanchion, and the 'I' beam. Due to the large span of the portal frame, the beams have been haunched (made deeper) at the supports, to stiffen the beams and reduce mid-span deflection.
Cross- bracing between the two frames and between the frames and 'Z' purlins is also evident in the photo. The 'Z' purlins, which are spaced at either 1200 or 1800 centres are used as an alternative to 'C' purlins to fix the roof cladding to.
At the apex of the portal frame, the two beams are butted and bolted together to form a rigid connection.
1 comment:
Great photo of 'Z' purlins being used opposed to the more traditional 'C' purlin.
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