Bs En 10311 Pdf ((top))

Current (as of April 2026); it partially superseded the older BS 534:1990 standard.

The contractor had used a "jumbo" section—a slightly larger beam—thinking it would be stronger. But the standard, BS EN 10311, dictated that you couldn't just swap steel sizes without recalculating the joint geometry. The bolt holes in the splice plates were drilled for a standard section. When the contractor forced the larger beam into the standard plates, the bolts didn't sit flush. They were eccentric. Bs En 10311 Pdf