Engineers who have visited or examined photos of the wreckage of the Champlain Towers South condominium complex have been struck by a possible flaw in its construction: Critical places near the base of the building appeared to use less steel reinforcement than called for in the project’s original design drawings... “The bars might not be arranged like the original drawings call for,” Mr. Kilsheimer said in an interview. He said he would need to inspect the rubble more closely to determine whether in fact the slab-to-column connections contained less steel than expected. R. Shankar Nair, a member of the National Academy of Engineering and former chairman of the Council on Tall Buildings and Urban Habitat, was among the other engineers who reviewed photographs and saw inconsistencies between the design and the steel that remained visible in the columns.