How 'Microcracks' Undermined San Francisco's New Bus Terminal

How 'Microcracks' Undermined San Francisco's New Bus Terminal

Engineers clambered up to the girders and slowly excised the cracked chunks with a diamond-oxide-studded cable saw, “so we could cut through it without heating it up and disturbing any of the evidence,” says Karl Frank, a civil engineer and steel-failure specialist working with Herrick, another company involved in building the terminal.