Brittle Compression Failures in Aci 318-14 Compliant RC Structural Walls With Well-Detailed Boundary Zones


Abstract eng:
Field observations following recent earthquakes (2010 Chile, 2011 New Zealand) identified the vulnerability of flexuredominant shear walls to brittle compression and strength loss, apparently prior to developing significant inelastic deformation capacities. To better understand the performance limitations of modern, code-compliant shear walls, two shear wall panels were tested under combined axial load and increasing cyclic moment and shear. The wall panel specimens represented the lower portion of a cantilever wall within an 8-story building. One wall had a rectangular cross-section, and the other had a T-shape cross-section with an enlarged boundary at one end of the wall. Test variables included the arrangement of boundary longitudinal and transverse reinforcement, and depth of the compression zone (influenced by axial load and quantity of longitudinal reinforcement). For both tests, axial load was held constant (Pu/Awf’c=0.10). Brittle compression failures were observed for both walls at plastic rotations, measured over an assumed plastic hinge length of one-half the length of the wall, between 0.01 and 0.015 radian. Test results indicate that brittle failures occurred because of the inability of thin compression zones to distribute compression strains over a significant height following crushing/spalling of unconfined concrete at wall edges.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1236.:
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