Cyclic Testing of Reinforced Concrete Walls with Distributed Minimum Vertical Reinforcement
Publication: Journal of Structural Engineering
Volume 143, Issue 5
Abstract
During the 2010/2011 Canterbury earthquakes in New Zealand, several reinforced concrete (RC) walls in multistory buildings formed only a limited number of cracks at the wall base with a fracture of vertical reinforcement observed. Recent research suggests that walls designed with minimum vertical reinforcement in accordance with current New Zealand standards may not exhibit large ductility during earthquakes. To investigate this theory further, a total of six flexure dominant RC walls with two layers of distributed vertical reinforcement in accordance with minimum requirements were tested. The test walls were typical of multistory RC walls in regions with moderate seismicity in New Zealand and were used to examine the effect of shear span ratio, axial load, and reinforcement ties in the wall end region. The experimental results confirmed that the current minimum vertical reinforcement limits are insufficient to ensure that a large number of secondary flexural cracks will occur in the plastic hinge region. The lateral-load response of the walls was controlled by one or two main large flexural cracks at the wall base. This behavior greatly reduced the spread of plasticity and resulted in several potential issues, such as limited drift capacity and premature reinforcement buckling or fracture. Recommendations are provided related to minimum vertical reinforcement requirements, plastic hinge length assumptions, ultimate drift capacity, and antibuckling reinforcement.
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Acknowledgments
Financial support for this research was provided by the Natural Hazards Research Platform through Contract C05X0907 in addition to the Chinese Scholarship Council and the University of Auckland. The assistance of Daniel Ripley, Jerome Quenneville, Mark Byrami, Ross Reichardt, Kimberley Twigden, Ash Jones, Ignačák Miroslav, Pouya Seifi, Alex Shegay, Damien Duchet, Astrid Michard, and Theodore Carlos during the testing is greatly appreciated.
References
ACI (American Concrete Institute). (2008). “Acceptance criteria for special unbonded post-tensioned precast structural walls based on validation testing and commentary.” Farmington Hills, MI.
ACI (American Concrete Institute). (2013). “Guide for testing reinforced concrete structural element under slowly applied simulated seismic loads.” Farmington Hills, MI.
ACI (American Concrete Institute). (2014). “Building code requirements for structural concrete (ACI 318-14) and commentary.” ACI 318-14, Farmington Hills, MI.
Adebar, P., Ibrahim, A. M. M., and Bryson, M. (2008). “Test of high-rise core wall: Effective stiffness for seismic analysis.” ACI Struct. J., 105(4), 509–512.
Adebar, P., Mutrie, J., and DeVall, R. (2005). “Ductility of concrete walls: The Canadian seismic design provisions 1984 to 2004.” Can. J. Civ. Eng., 32(6), 1124–1137.
AS (Standards Australia) and NZS (Standards New Zealand). (2001). “Steel reinforcing materials.” AS/NZS 4671, Sydney, Australia, and Wellington, New Zealand.
Bohl, A., and Adebar, P. (2011). “Plastic hinge lengths in high-rise concrete shear walls.” ACI Struct. J., 108(2), 148–157.
Brueggen, B. L. (2009). “Performance of T-shaped reinforced concrete structural walls under multi-directional loading.” Ph.D. thesis, Univ. of Minnesota, Ann Arbor, MI.
Canterbury Earthquakes Royal Commission. (2012). “Final report: Volume 2: The performance of Christchurch CBD buildings.” Wellington, New Zealand.
CEN (European Committee for Standardization). (2004). “Eurocode 2: Design of concrete structures. Part 1-1: General rules and rules for buildings.” 1992-1-1:2004, Brussels, Belgium.
CEN (European Committee for Standardization). (2004). “Eurocode 8: Design of structures for earthquake resistance.” Brussels, Belgium.
Crisafulli, F. J., Restrepo, J. I., and Park, R. (2002). “Seismic design of lightly reinforced precast concrete rectangular wall panels.” PCI J., 47(4), 104–121.
Dazio, A., Beyer, K., and Bachmann, H. (2009). “Quasi-static cyclic tests and plastic hinge analysis of RC structural walls.” Eng. Struct., 31(7), 1556–1571.
Deng, K., Pan, P., Shi, Y., Miao, Q., Li, W., and Wang, T. (2012). “Quasi-static test of reinforced concrete shear wall with low concrete strength and reinforcement ratio.” Hong Kong.
fib (Fédération Internationale du Béton). (2013). fib model code for concrete structures 2010, Wiley, Hoboken, NJ.
Greifenhagen, C., and Lestuzzi, P. (2005). “Static cyclic tests on lightly reinforced concrete shear walls.” Eng. Struct., 27(11), 1703–1712.
Han, S. W., Oh, Y. H., and Lee, L. H. (2002). “Seismic behaviour of structural walls with specific details.” Mag. Concr. Res., 54(5), 333–345.
Henry, R. S. (2013). “Assessment of minimum vertical reinforcement limits for RC walls.” Bull. N.Z. Soc. Earthquake Eng., 46(2), 88–96.
Hidalgo, P. A., Ledezma, C. A., and Jordan, R. M. (2002). “Seismic behavior of squat reinforced concrete shear walls.” Earthquake Spectra, 18(2), 287–308.
Hines, E. M., Restrepo, J. I., and Seible, F. (2004). “Force-displacement characterization of well-confined bridge piers.” ACI Struct. J., 101(4), 537–548.
Hiraishi, H. (1984). “Evaluation of shear and flexural deformations of flexural type shear walls.” Bull. N.Z. Natl. Soc. Earthquake Eng., 17(2), 135–144.
Kam, W. Y., Pampanin, S., and Elwood, K. J. (2011). “Seismic performance of reinforced concrete buildings in the 22 February Christchurch (Lyttelton) earthquake.” Bull. N.Z. Soc. Earthquake Eng., 44(4), 239–278.
Li, B., Pan, Z., and Xiang, W. (2012). “Experimental evaluation of seismic performance of squat RC structural walls with limited ductility reinforcing details.” J. Earthquake Eng., 19(2), 313–331.
Lowes, L. N., Lehman, D. E., Birely, A. C., Kuchma, D. A., Marley, K. P., and Hart, C. R. (2012). “Earthquake response of slender planar concrete walls with modern detailing.” Eng. Struct., 43, 31–47.
NZS (Standards New Zealand). (1986). “Methods of test for concrete. Part 2: Tests relating to the determination of strength of concrete.” Wellington, New Zealand.
NZS (Standards New Zealand). (2006). “Concrete structures standard (Amendment 2).” Wellington, New Zealand.
Park, R. (1989). “Evaluation of ductility of structures and structural assemblages from laboritory testing.” Bull. N.Z. Nat. Soc. Earthquake Eng., 22(3), 155–166.
Priestley, M. J. N., and Kowalsky, M. J. (1998). “Aspects of drift and ductility capacity of rectangular cantilever structural walls.” Bull. N.Z. Natl. Soc. Earthquake Eng., 31(2), 73–85.
SESOC (Structural Engineering Society of New Zealand). (2011). “Preliminary observations from Christchurch earthquakes.” ⟨http://canterbury.royalcommission.govt.nz/documents-by-key/20111205.1533⟩ (Dec. 5, 2011).
Smith, P., and England, V. (2012). “Independent assessment on earthquake performance of Gallery Apartments—62 Gloucester Street.” Canterbury Earthquakes Royal Commission, Wellington, New Zealand.
Sritharan, S., Beyer, K., Henry, R. S., Chai,Kowalsky, M., and Bull, D. (2014). “Understanding poor seismic performance of concrete walls and design implications.” Earthquake Spectra, 30(1), 307–334.
Wallace, J. W., and Orakcal, K. (2002). “ACI 318-99 provisions for seismic design of structural walls.” ACI Struct. J., 99(4), 499–508.
Wood, S. L. (1989). “Minimum tensile reinforcement requirements in walls.” ACI Struct. J., 86(5), 582–591.
Wood, S. L., Stark, R., and Greer, S. A. (1991). “Collapse of eight-story RC building during 1985 Chile earthquake.” J. Struct. Eng., 600–619.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 5 • May 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Mar 19, 2015
Accepted: Oct 12, 2016
Published online: Nov 30, 2016
Discussion open until: Apr 30, 2017
Published in print: May 1, 2017
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