11. Wooden joists spanned between the floor beams , creating a substructure that was decked with 2-foot planks. 12. Three floor beams of the top floor of the building were destroyed, causing major structural damage. 13. The floor beams , fencing and walls, made of dense steel, covered the passageway for vehicles beneath. 14. Located on the basement level of the building, these were the columns supporting the main floor beams . 15. The plate-girder floor beams supported wooden stringers and floored with planks across the width of the bridge. 16. It had rotted and the floor had sunk by causing the second main floor beam to fracture. 17. It has zinc-clad main and suspender cables and flooring, stringers, floor beams and portals of untreated oak timbers. 18. Each floor has been reduced in height by 50 mm and structural floor beam depths have been changed. 19. I-floor beams carry the span's deck. 20. Safety features : dual front and side air bags, side-impact door and floor beams , power anti-lock disc brakes
