Howard Hill, director of technical operations and a principal of Wiss, Janney, Elstner Associates Inc., examined the collapsed Interstate-35W Bridge in Minneapolis. He traded emails recently with ENR Chicago Bureau chief Tudor Van Hampton on how he heard of the disaster, what he found when he reached the scene and how WJE decided the design error was made. Photo: Courtesy Howard Hill Related Links: NTSB Cites Gussets and Loads in Collapse Safety Board Finds Bridge Plates Too Thin NTSB Finds Fractured Gussets in I-35 Span WJE's Final Report NTSB's Final Report As the first person to point to gusset plates
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.