Image courtesy of University of Washington, Seattle/Network for Earthquake Engineering Simulation Octagonal prefabricated pre-tensioned concrete columns may improve bridge behavior in an earthquake. Related Links: Reno Researchers Shake Things Up U.S. Post-Tensioned Seismic Systems Not Yet Tested by a Quake University researchers have unveiled a new concrete bridge bent system that they say reduces earthquake damage while speeding construction. The new rocking design uses octagonal, prefabricated, pretensioned concrete columns for added elasticity and a recentering effect that minimizes seismic-related structural damage and displacement. The structural support system’s critical components are created under factory conditions for improved quality and reduced erection
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.