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Among the reasons for the flaws in steel buildings were problems in welding technique and inspections, the filler metal used in the welds and the basic configuration of the connection between vertical columns and horizontal beams.

Among the reasons for the flaws in steel buildings were problems in welding technique and inspections, the filler metal used in the welds, and the basic configuration of the connection between vertical columns to horizontal beams, Hamburger said.

One is to remove the filler metal used to weld together the steel frame, and replace it with a more modern, tougher metal, said structural engineer Thomas Sabol, a principal at Englekirk.