Inspections of Boston's Big Dig reveal hundreds of bolts that need to be reinforced. Guests talk about the materials and techniques used in major construction projects. What keeps houses, bridges and tunnels from falling apart? And are there ways to easily detect damage before it becomes severe?
Steven M. Cramer, professor, civil and environmental engineering; associate dean of academic affairs; College of Engineering, University of Wisconsin-Madison
Christopher Earls, editor-in-chief, Americas, for the journal Steel and Composite Structures; associate professor, School of Civil and Environmental Engineering, Cornell University
Paulo Monteiro, professor of civil and environmental engineering University of California, Berkeley