Concern is growing over a recently released “sample” ordinance for high-performance buildings from the Portland Cement Association. “High Performance Building Requirements for Sustainability,” which adds to and amends the International Building Code, was developed outside the standard consensus process and is biased toward concrete, say sources. “Wholesale changes” to scope and requirements of the IBC outside of the established consensus process are not supported by the American Institute of Architects’ policy on the development and promulgation of codes and standards, says the AIA. The majority of IBC modifications in the document have been fully vetted in the national model code
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.