The inventors and original supplier of a popular shear-stud reinforcement for two-way flat slabs in concrete frames are up in arms over charges, based on recent research, that the American Concrete Institute's model code governing use of the studs is flawed. The researchers claim that, consequently, there is potential for premature failure due to punching shear at slab-column connections, especially under earthquake loads.A. Ghali, professor emeritus of civil engineering, University of Calgary, Alberta, Canada, and the lead researcher for original studies on shear studs dating back to the 1970s, disagrees. Extensive testing shows that code-specified "equations and detailing for the
The Crystal Bridges Museum of American Art opened to the public on Nov.11, 2011. The complex was completed on schedule, according to Bill Greek, senior vice president of Linbeck Group LLC, which led the joint venture that built the project. Construction of the 201,000-sq-ft museum—a collection of 10 linked buildings—was challenging, thanks to its setting over or alongside a stream in a blasted out ravine in Bentonville, Ark., and its two weirs, curved forms and cable-supported roofs, courtesy of architect Moshe Safdie. Work even required damming Crystal Spring. Though the museum is open to the public, the diverted creek has
Courtesy of Whole Water Systems LLC Utilities often do not allow constructed wetlands and other decentralized treatment systems. Courtesy of the Internatonal Living Future Institute Composting toilet systems are the most environmentally benign of the decentralized wastewater treatment systems studied in a recent report. For cities to be truly sustainable and resilient, wastewater treatment needs to be localized, not centralized, chorused landscape architects and others at the American Society of Landscape Architects' 2011 Annual Meeting & Expo, held on Oct. 29 to Nov. 2 in San Diego.“There is room for improvement in the modern approach to stormwater management,” said Jack
Courtesy of Crystal Bridges Museum of American Art Three of the museum buildings' roofs have glue-laminated arches supported on cables. Courtesy of Crystal Bridges Museum of American Art The buildings are open, but the creek has yet to be filled with water. The Crystal Bridges Museum of American Art opened to the public on Nov. 11, 2011. The complex was completed on schedule, according to Bill Greek, senior vice president of Linbeck Group LLC, which led the joint venture that built the project. Construction of the 201,000-sq-ft museum—a collection of 10 linked buildings—was challenging, thanks to its setting over and
PHOTO COURTESY OF Pacifica honolulu High-rise condo tower re-emerges from bankruptcy. Pacifica Honolulu, a 46-story project that was mothballed for more than a year after its first developer went bankrupt, opened as planned early this month. Last year, San Diego-based developer OliverMcMillan resurrected the $284-million project, first called Moana Vista. Ledcor Construction, working with Architects Hawaii Ltd., Gensler Architects and Baldridge Associates Structural Engineers, finished the job that was begun by the first general contractor, Hawaiian Dredging Construction, which lost its construction loan when the project was at the 27th floor.
Related Links: Online database of stalled projects Stalled Construction Projects and Financing In an effort to try to relieve some of the stress of the recession in construction, the American Institute of Architects is becoming an online matchmaker, of sorts. On Nov. 7, the AIA launched a stalled-projects online database intended to hook up developers, architects and other industry leaders with investors and funders to restart mothballed U.S. building projects. The find-a-business-partner initiative is designed to help architects and their clients find a solution to the “primary issue plaguing the design and construction industry—access to credit,” says the AIA.“The Match.com
SOURCE: ACI 318-11 Structural concrete building code In a response to Bostons Big Dig failure, overhead, horizontal and slanted panels, installed using adhesive anchors, are included in the 2011 concrete standard for the first time. There are radical changes in the works for the concrete design standard of the American Concrete Institute. ACI committee members are about halfway through a six-year overhaul of the 502-page tome, aiming to validate its content and make it more user-friendly. It is the first major revamp in nearly 45 years.In a big departure, the 2014 edition of the ACI 318: Structural Concrete Building Code,
The Council on Tall Buildings & Urban Habitat is vigorously advancing its mission—to help upgrade skyscraper production by offering better design tools and standardizing practice worldwide. In a fundamental shift, the 42-year-old CTBUH is engaging in research, including a $2-million fire study that will culminate in a real building burn.Next year, CTBUH plans to publish five design guidelines on wind-tunnel testing, structural outriggers, performance-based seismic design, column shortening, foundations and natural ventilation. “There is a need for better tall buildings around the world,” said Antony Wood, CTBUH's executive director, at the CTBUH 2011 World Conference in Seoul. The Oct. 10-12
Photo by Nadine Post for ENR Since Antony Wood joined the council in 2006, firm membership has quadrupled. Antony Wood has been the executive director of the Council on Tall Buildings and Urban Habitat since October 2006. Wood, 41, is also a professor of architecture at the Illinois Institute of Technology in Chicago, which is where the council is headquartered. Last year, he earned his Ph.D. in architecture from the University of Nottingham, where he taught before he relocated to Chicago to lead the council. His Oct. 12 interview with ENR at the CTBUH Seoul World Conference, which was held
The American Society of Civil Engineers has decided that emergency changes to wind-load provisions in ASCE's 2010 building design standard are not needed. ASCE recently reviewed the provisions, prompted by a red flag raised by structural engineer-researcher Emil Simiu, who says the wind standard is flawed and needlessly complex. SIMIUInconsistencies in chapters 26-31 of the 608-page “Minimum Design Loads for Buildings and Other Structures: ASCE/SEI 7-10” can result in “unconservative” designs, says Simiu, a member of the 2010 standard's subcommittee on wind loads. “Some buildings can be produced that do not meet the intended risk levels implicit in the standard,”
