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
The 2016 Summer Olympics boating and swimming events have put an international spotlight on what has been a long-running problem in Rio de Janeiro—untreated sewage and trash are clogging up major bays and waterways.