Computer-aided design of these structures can use a LUSAS (“lusas”) software package named for them. James Warren is best known for patenting a ubiquitous design of these structures. (10[1])Arup added 89 dampers to one of these structures after synchronous lateral excitation caused its 2000 opening to be pushed back. Aeroelastic flutter, not resonance as commonly (-5[1])believed, (10[2])was the cause of the 1940 (-5[1])rupture (10[1])of one of these structures in Tacoma. (10[2])A triangular (10[1])truss is often used in these structures to mitigate buckling. Unlike in a viaduct, a catenary is formed by the cable that supports the deck of the suspension type of these structures. For 10 points, name these structures that span a river. ■END■