Journal
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
Volume 6, Issue 1, Pages 3-18Publisher
SPRINGEROPEN
DOI: 10.1007/s40069-012-0001-4
Keywords
testing; structural wall; coupling beam; modeling; detailing
Categories
Funding
- EERI Learning from Earthquakes program [NSF CMMI-0758529]
- NSF RAPID [CMMI-1110860, CMMI-1000268]
- NSF NEES REU [CMMI-0927178]
- Charles Pankow Foundation (CPF Grant) [4-06]
- Japan Society for the Promotion of Science (JSPS)
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Observed wall damage in recent earthquakes in Chile and New Zealand, where modern building codes exist, exceeded expectations. In these earthquakes, structural wall damage included boundary crushing, reinforcement fracture, and global wall buckling. Recent laboratory tests also have demonstrated inadequate performance in some cases, indicating a need to review code provisions, identify shortcomings and make necessary revisions. Current modeling approaches used for slender structural walls adequately capture nonlinear flexural behavior; however, strength loss due to buckling of reinforcement and nonlinear and shear-flexure interaction are not adequately captured. Additional research is needed to address these issues. Recent tests of reinforced concrete coupling beams indicate that diagonally-reinforced beams detailed according to ACI 318-11(1) can sustain plastic rotations of about 6% prior to significant strength loss and that relatively simple modeling approaches in commercially available computer programs are capable of capturing the observed responses. Tests of conventionally-reinforced beams indicate less energy dissipation capacity and strength loss at approximately 4% rotation.
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