Title:
Impact of Bar Spacing and Steel Fiber on Out-of-Plane Response of Lightly Reinforced Concrete Walls
Author(s):
Laura N. Lowes, Ray Yu, Dawn E. Lehman, and Scott Campbell
Publication:
Structural Journal
Volume:
122
Issue:
3
Appears on pages(s):
5-16
Keywords:
concrete wall; fiber-reinforced concrete (FRC); finite element analysis; insulated concrete form (ICF) walls
DOI:
10.14359/51745465
Date:
5/1/2025
Abstract:
Reinforced concrete walls are commonly used in low- and mid-rise
construction because they provide high strength, stiffness, and
durability. In regions of low and moderate seismicity, ACI 318
Code requirements for minimum reinforcement ratio and maximum
reinforcement spacing typically control over strength-based
requirements. However, these requirements are not well-supported
by research. The current study investigates requirements for the
amount and spacing of reinforcement using experimentally validated
nonlinear finite element modeling. For lightly reinforced
concrete walls subjected to out-of-plane loading: 1) peak strength
is controlled by concrete cracking; and 2) residual strength
depends on the number of curtains of steel. Walls with very low
steel-fiber dosages were also studied. Results show that fiber, rather
than discrete bars, provides the most benefit to wall strength, with
fiber-reinforced concrete walls achieving peak strengths more than
twice that of identically reinforced concrete walls.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19) (Reapproved 2022),” American Concrete Institute, Farmington Hills, MI, 2019, 624 pp.
2. Roller, J., “Design Criteria for Insulating Concrete Form Wall Systems,” PCA Serial No. 2073, Portland Cement Association, Skokie, IL, 1996, 51 pp.
3. Ansys, Inc., “LS-DYNA Version 12.0.0,” Canonsburg, PA, 2020, https://www.lstc.com/products/ls-dyna. (last accessed Feb. 24, 2025)
4. Zhao, M.-Z.; Lehman, D. E.; and Roeder, C. W., “Modeling Recommendations for RC and CFST Sections in LS-Dyna Including Bond Slip,” Engineering Structures, V. 229, Feb. 2021, Article No. 111612. doi: 10.1016/j.engstruct.2020.111612
5. Abdullah, S. A., “Reinforced Concrete Structural Walls: Test Database and Modeling Parameters,” PhD dissertation, University of California, Los Angeles, Los Angeles, CA, 2019, 333 pp.
6. Marcalikova, Z.; Cajka, R.; Bilek, V.; Bujdos, D.; and Sucharda, O., “Determination of Mechanical Characteristics for Fiber-Reinforced Concrete with Straight and Hooked Fibers,” Crystals, V. 10, No. 6, June 2020, Article No. 545. doi: 10.3390/cryst10060545
7. Woo, S.-K.; Kim, K.-J.; and Han, S.-H., “Tensile Cracking Constitutive Model of Steel Fiber Reinforced Concrete (SFRC),” KSCE Journal of Civil Engineering, V. 18, No. 5, June 2014, pp. 1446-1454. doi: 10.1007/s12205-014-0335-3
8. Kazemi, M. T.; Fazileh, F.; and Ebrahiminezhad, M. A., “Cohesive Crack Model and Fracture Energy of Steel-Fiber-Reinforced-Concrete Notched Cylindrical Specimens,” Journal of Materials in Civil Engineering, ASCE, V. 19, No. 10, Oct. 2007, pp. 884-890. doi: 10.1061/(ASCE)0899-1561(2007)19:10(884)
9. Kim, M. O., and Bordelon, A., “Determination of Total Fracture Energy for Fiber-Reinforced Concrete,” Fracture Mechanics Applications in Concrete, SP-300, C. Gaedicke, ed., American Concrete Institute, Farmington Hills, MI, 2015, pp. 4.1-4.15.
10. Pająk, M., and Ponikiewski, T., “Flexural Behavior of Self-
Compacting Concrete Reinforced with Different Types of Steel Fibers,” Construction and Building Materials, V. 47, Oct. 2013, pp. 397-408. doi: 10.1016/j.conbuildmat.2013.05.072
11. Vandewalle, L., “Postcracking Behaviour of Hybrid Steel Fiber Reinforced Concrete,” High-Performance Concrete, Brick-Masonry and Environmental Aspects: Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-6), V. 3, A. Carpinteri, P. Gambarova, G. Ferro, and G. Plizzari, eds., Catania, Sicily, Italy, 2007, pp. 1367-1375.
12. Rathje, E. M.; Dawson, C.; Padgett, J. E.; Pinelli, J.-P.; Stanzione, D.; Adair, A.; Arduino, P.; Brandenberg, S. J.; Cockerill, T.; Dey, C.; Esteva, M.; Haan, F. L. Jr.; Hanlon, M.; Kareem, A.; Lowes, L.; Mock, S.; and Mosqueda, G., “DesignSafe: New Cyberinfrastructure for Natural Hazards Engineering,” Natural Hazards Review, ASCE, V. 18, No. 3, Aug. 2017, p. 06017001. doi: 10.1061/(ASCE)NH.1527-6996.0000246
13. Murcia-Delso, J., “Bond-Slip Behavior and Development of Bridge Column Longitudinal Reinforcing Bars in Enlarged Pile Shafts,” PhD dissertation, University of California, San Diego, San Diego, CA, 2013, 377 pp.
14. Murcia-Delso, J., and Shing, P. B., “Bond-Slip Model for Detailed Finite-Element Analysis of Reinforced Concrete Structures,” Journal of Structural Engineering, ASCE, V. 141, No. 4, Apr. 2015, p. 04014125. doi: 10.1061/(ASCE)ST.1943-541X.0001070
15. Yu, R., “Minimum Design Requirements for Insulated Concrete Form Wall Systems,” master’s thesis, University of Washington, Seattle, WA, 2021, 185 pp.