Title:
Corrective Measures for Noncontact Splices in Concrete Block Masonry
Author(s):
Aleksandar Kisin and Lisa R. Feldman
Publication:
Structural Journal
Volume:
112
Issue:
4
Appears on pages(s):
475-484
Keywords:
bond; concrete block construction; knockout webs; lap splices (contact and noncontact); transverse reinforcement; wall splice specimens
DOI:
10.14359/51687704
Date:
7/1/2015
Abstract:
Six corrective measures for increasing the tensile resistance of
noncontact lapped bars located in adjacent cells in concrete block construction were evaluated in wall splice specimens to assess their effectiveness. Results were compared to those for specimens with contact lap splices and unremediated noncontact lap splices. All specimens were constructed in running bond with all cells fully grouted and with No. 15 (0.6 in. diameter) deformed steel bars with 200 mm (8 in.) lap splice lengths. Noncontact lap splices remediated with knockout webs, s-shaped splice bars, transverse reinforcement, and confinement cells were capable of achieving a tensile resistance similar to that of contact lap splices of the same
length. Knockout webs within the splice region, used on their own as a corrective measure, increased the tensile resistance of the reinforcement by 60% and offered a simple and cost-effective means of remediating noncontact lap splices.
Related References:
1. Ahmed, K., and Feldman, L. R., “Evaluation of Contact and Noncontact Lap Splices in Concrete Block Masonry Construction,” Canadian Journal of Civil Engineering, V. 39, No. 5, 2012, pp. 515-525. doi: 10.1139/l2012-026
2. CAN/CSA S304-14, “Design of Masonry Structures,” Canadian Standards Association, Mississauga, ON, Canada, 2014, 176 pp.
3. Kisin, A., and Feldman, L. R., “Construction Solutions for Non-Contact Lap Splices in Concrete Block Construction,” 12th Canadian Masonry Symposium, 2013, 11 pp.
4. CAN/CSA A23.1-09, “Construction Materials and Concrete Construction/Test Methods and Standard Practices for Concrete,” Canadian Standards Association, Mississauga, ON, Canada, 2009, 582 pp.
5. ASTM C140-12, “Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units,” ASTM International, West Conshohocken, PA, 2012, 18 pp.
6. CAN/CSA A179-04(R2014), “Mortar and Grout for Unit Masonry,” Canadian Standards Association, Mississauga, ON, Canada, 2004, 94 pp.
7. CAN/CSA A3000-13, “Cementitious Materials Compendium,” Canadian Standards Association, Mississauga, ON, Canada, 2013, 254 pp.
8. CAN/CSA A371-04(R2014), “Masonry Construction for Buildings,” Canadian Standards Association, Mississauga, ON, Canada, 2004, 86 pp.
9. ASTM C1019-13, “Standard Test Method for Sampling and Testing Grout,” ASTM International, West Conshohocken, PA, 2013, 5 pp.
10. ASTM E178-08, “Standard Practice for Dealing with Outlying Observations,” ASTM International, West Conshohocken, PA, 2008, 18 pp.
11. Drysdale, R. G., and Hamid, A. A., “Masonry Structures: Behaviour and Design,” Canada Masonry Design Centre, Mississauga, ON, Canada, 2005, 769 pp.
12. CAN/CSA S304.1-04(R2010), “Design of Masonry Structures,” Canadian Standards Association, Mississauga, ON, Canada, 2004, 148 pp.
13. CAN/CSA G30.18-09, “Carbon Steel Bars for Concrete Reinforcement,” Canadian Standards Association, Mississauga, ON, Canada, 2009, 32 pp.
14. ASTM A370-12, “Standard Test Methods and Definitions for Mechanical Testing of Steel Products,” ASTM International, West Conshohocken, PA, 2011, 48 pp.
15. Joint ACI-ASCE Committee 530, “Building Code Requirements and Specifications for Masonry Structures (TMS 402-13/ACI 530-13/ASCE 5-13),” Masonry Standards Joint Committee, Boulder, CO, 2013, 365 pp.
16. Sanchez, D. S., and Feldman, L. R., “The Effect of Splice Length and Distance Between Lapped Reinforcing Bars in Concrete Block Specimens,” 12th Canadian Masonry Symposium, 2013, 11 pp.
17. Kent, D. C., and Park, R., “Flexural Members with Confined Concrete,” Journal of the Structural Division, ASCE, V. 97, No. ST7, July 1971, pp. 1969-1990.
18. Bischoff, P. H., “Reevaluation of Deflection Prediction for Concrete Beams Reinforced with Steel and Fiber Reinforced Polymer Bars,” Journal of Structural Engineering, ASCE, V. 131, No. 5, May 2005, pp. 752-767. doi: 10.1061/(ASCE)0733-9445(2005)131:5(752)