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<blockquote data-quote="designanddetail" data-source="post: 7719343" data-attributes="member: 43530"><p>If your building a grain store or something similar then the actual steel frame isn't going to more than 20% of the project cost.</p><p></p><p>If you are going for a wide span shed then getting a specific design done by an experienced engineer who does a lot of structural work is essential. We recently did a relatively small project that had the steel sizes given by the original generic consultant engineers they were structural engineers but covered everything from block walls to floor slabs and glulam beams etc, we suggested a re-design and sourced it for the client at a cost of £1400. The new design came in with a 6 tonne saving in the main steel frame, that's about £10k saved.</p><p></p><p>A lot of the large warehouses going up are designed to the very limit. It is quite common to see some steel elements at 98-99% capacity in the calculations. To the extent that the roof pitch is usually kicked up half a degree in manufacturing to allow for the sagging that will occur in the rafters once erected. This is one reason why a lot of industrial building don't have and never will have PV panels. There just isn't any spare capacity in the steel frame to take them if they were not specified in the original build document. Its quite common that we have to change the rafter sizes midway through the drawing process as the end user (not usually the building owner) states they need them to meet some green criteria in their industry etc.</p></blockquote><p></p>
[QUOTE="designanddetail, post: 7719343, member: 43530"] If your building a grain store or something similar then the actual steel frame isn't going to more than 20% of the project cost. If you are going for a wide span shed then getting a specific design done by an experienced engineer who does a lot of structural work is essential. We recently did a relatively small project that had the steel sizes given by the original generic consultant engineers they were structural engineers but covered everything from block walls to floor slabs and glulam beams etc, we suggested a re-design and sourced it for the client at a cost of £1400. The new design came in with a 6 tonne saving in the main steel frame, that's about £10k saved. A lot of the large warehouses going up are designed to the very limit. It is quite common to see some steel elements at 98-99% capacity in the calculations. To the extent that the roof pitch is usually kicked up half a degree in manufacturing to allow for the sagging that will occur in the rafters once erected. This is one reason why a lot of industrial building don't have and never will have PV panels. There just isn't any spare capacity in the steel frame to take them if they were not specified in the original build document. Its quite common that we have to change the rafter sizes midway through the drawing process as the end user (not usually the building owner) states they need them to meet some green criteria in their industry etc. [/QUOTE]
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