Caltrans engineers are scrambling to replace Pfeiffer Canyon Bridge, a 317-ft-long, concrete continuous box-beam bridge on a key coastal highway after mudslides moved one of the support columns more than a foot, causing the span to crack and bow.
Caltrans closed Highway 1 in Big Sur on Feb. 15 and determined that it would have to be replaced after a wet winter undermined the foundation on the steep hillside. The closure left some residents stranded, as other routes were blocked by mudslides in the area.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.