The development in California, USA over the past twenty years of a unique onepiece confinement reinforcement product called Welded Reinforcement Grids (WRG) has resulted in 2000 tons of WRG being installed in California's tallest concrete building and also the world's tallest precast concrete building in a zone of highest seismicity. Often more than thirty pieces of hoops and cross ties are replaced with just one WRG resulting in the elimination of rebar congestion, and reduction of time and labor to assemble rebar cages, set rebar cages, set forms and pour concrete because protruding hooks are eliminated and rebar cages with WRG are very distortion resistant. Recent shake table tests proved that the superior ductile performance of WRG reinforced low rise concrete structures will allow a fifty percent reduction of principal reinforcement steel now required by present day seismic codes. Very tall concrete buildings are now being rapidly constructed in high intensity seismic regions, at lower cost, when constructed with high strength concrete and WRG manufactured with high strength steel to dimensional tolerances of ±3 mm.
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Document Type: Research Article
Publication date: 01 February 2008
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Structural Engineering International (SEI), the quarterly Journal of IABSE, published since 1991, is the leading international journal of structural engineering dealing with all types of structures and materials. SEI offers its readers a unique blend of short profiles on recent structures, and longer, in-depth technical articles on research, development, design, construction and maintenance. Articles are written by practicing engineers and academia from around the world and reflect the high standards of IABSE. IABSE Peer Review stamps are given to papers that have passed through a highly selective review process and demonstrate a significant contribution to the state of structural engineering knowledge.To recognise contributions of the highest quality, an Outstanding Paper Award is presented each year.
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