The American Concrete Institute is seeking comments by Jan. 17 on the 2011 update of its standard ACI 318, Building Code Requirements for Structural Concrete and Commentary. Among other additions, the draft includes new design requirements for adhesive anchors and enhanced reinforcement detailing requirements for seismic applications. The document also contains new test methods for sulfate resistance and new requirements for detailing circular column ties. The draft ACI 318-11 can be downloaded at www.concrete.org/pubs/standaction.asp.
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.