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I am working on a project where we are looking to build a 7 bay shed with 30m Span each bay and length of 100m. Now the feedback I got from some chinese engineers was that the standard design in china is either 24m or 27m or 30m, with columns at every 9 meter. So I am looking for some help in choosing between either of the 3 spans. I will be running 2 20 Tons capacity double girder cranes in each bay. In the future we will double the length of each bay so does that also play a part in span selection ?. Also the steel grades we can easily source are either SS400, a36, or s355 or q345. Does the grade of the material help in weight reduction and if so how much percentage, so we can compare. Few details I have regarding the crane is if 24m span, the total weight of the crane is 29 tons (including all components) if 27m span the total weight of the crane is 33 tons if 30m span the total weight of the crane is 38 tons There will be lot more inputs you may need from my side so you can post here and I will try to answer quickly. The lightest shed design and model will be awarded with a cash reward and a job offer based in Karachi. We are not a designing firm, we are the end user of this shed.