Span is the main frame width; bay spacing repeats along the length. A larger span usually means a heavier beam or roof; a larger bay changes purlins and wall rails. Fewer columns are not always better if cranes and aisles must fit.

Stores and workshops need different grids. Racking, pits and doors may move the bay. Align those interfaces before talking steel weight.

Numbers come from analysis and the local code, not from copying a “usual span” in an article. No order-ready beam depth is given here.

Send covering width, length, height and main equipment. Without them only the concept can be explained.

Tiankai Southeast fabricates marked members from approved drawings and supports erection by mark number. Sizes, loads and delivery follow the confirmed design file and contract; this page does not turn uncalculated tonnage, thickness or time into a promise.