Related Links: Building Sequence Probed at Cincinnati Casino Collapse Six contractors building Cincinnati's $400-million Horseshoe Casino did not take steps to ensure the building was stable before pouring a concrete floor atop the steel-framed structure, according to U.S. Occupational Safety and Health Administration citations issued earlier this month. The probe calls into question the roles, responsibilities and inspection procedures of the trades working on the project.The building is a straightforward design, with beam-to-column double connections. "I think the lesson to be learned is that every structure is unique, and every structure needs new consideration for safety," says Jeffrey L. Garrett,
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.