Guidelines for the performance-based design of structures to resist disproportionate collapse are under development by the American Society of Civil Engineers' Structural Engineering Institute. SEI expects to release a draft next year and publish the guidelines in 2013. “We are providing guidelines for those who wish to use them. We are not mandating use,” says Robert Smilowitz, chairman of the SEI's disproportionate collapse standards and guidance committee and a principal at structural engineer Weidlinger Associates Inc., New York City. “Our immediate objective is to provide a solid technical basis for designing structures that are more resistant to disproportionate collapse. It
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.