Title:
Shear Critical Deep Beams with Embedded Functionally Graded Concrete Struts
Author(s):
Jacob Yager, Neil A. Hoult, Evan C. Bentz, and Joshua Woods
Publication:
Structural Journal
Volume:
119
Issue:
6
Appears on pages(s):
245-257
Keywords:
deep beams without transverse reinforcement; distributed fiberoptic strain sensing; fresh-on-fresh concrete casting; functionally graded concrete (FGC); low-carbon concrete; low-cement content concrete; strut-and-tie model (STM)
DOI:
10.14359/51734805
Date:
11/1/2022
Abstract:
In this research, novel functionally graded concrete deep beams without transverse reinforcement for transfer girder applications were constructed with varying shaped embedded high-strength struts surrounded by low-cement content concrete. The cement content in the low-cement content concrete also varied, with a maximum total beam cement reduction of 47% compared to the control. The placement method also varied, further revealing issues with fresh-on-hardened concrete casting. The beams were tested in three-point bending and monitored using distributed fiber-optic
sensors (DFOS) and digital image correlation. The results of the
tests revealed that diagonal-shaped embedded struts designed for three-point bending had the highest load capacity increase of up to 26%. However, using shapes not compatible with three-point bending resulted in load capacity decreases. DFOS also enhanced the understanding of strut-and-tie mechanisms, allowing for the visualization of the strain distribution in struts and quantifying formations of the strut and tie.
Related References:
ACI Committee 224, 2007, “Causes, Evaluation, and Repair of Cracks in Concrete Structures (ACI 224.1R-07),” American Concrete Institute, Farmington Hills, MI, 22 pp.
Arrhenius, S., 1896, “On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground,” The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, V. 41, No. 251, Apr., pp. 237-276. doi: 10.1080/14786449608620846
Barrias, A.; Casas, J. R.; and Villalba, S., 2018, “Embedded Distributed Optical Fiber Sensors in Reinforced Concrete Structures—A Case Study,” Sensors (Basel), V. 18, No. 4, Apr., Article No. 980, 22 pp. doi: 10.3390/s18040980
Brault, A., and Hoult, N. A., 2019a, “Distributed Reinforcement Strains: Measurement and Application,” ACI Structural Journal, V. 116, No. 4, July, pp. 115-127. doi: 10.14359/51714483
Brault, A., and Hoult, N., 2019b, “Monitoring Reinforced Concrete Serviceability Performance Using Fiber-Optic Sensors,” ACI Structural Journal, V. 116, No. 1, Jan., pp. 57-70. doi: 10.14359/51710870
CSA A23.3-14, 2014, “Design of Concrete Structures,” CSA Group, Toronto, ON, Canada, 297 pp.
Davis, M. B.; Hoult, N. A.; Bajaj, S.; and Bentz, E. C., 2017, “Distributed Sensing for Shrinkage and Tension-Stiffening Measurement,” ACI Structural Journal, V. 114, No. 3, May-June, pp. 753-764. doi: 10.14359/51689463
Fayyad, T. M., and Lees, J. M., 2014, “Application of Digital Image Correlation to Reinforced Concrete Fracture,” Procedia Materials Science, V. 3, pp. 1585-1590. doi: 10.1016/j.mspro.2014.06.256
Herrmann, M., and Sobek, W., 2017, “Functionally Graded Concrete: Numerical Design Methods and Experimental Tests of Mass-Optimized Structural Components,” Structural Concrete, V. 18, No. 1, Feb., pp. 54-66. doi: 10.1002/suco.201600011
Hoult, N. A.; Dutton, M.; Hoag, A.; and Take, W. A., 2016, “Measuring Crack Movement in Reinforced Concrete Using Digital Image Correlation: Overview and Application to Shear Slip Measurements,” Proceedings of the IEEE, V. 104, No. 8, Aug., pp. 1561-1574. doi: 10.1109/JPROC.2016.2535157
Lehne, J., and Preston, F., 2018, “Making Concrete Change: Innovation in Low-carbon Cement and Concrete,” Chatham House Report, June, 138 pp.
Li, P. P.; Sluijsmans, M. J. C.; Brouwers, H. J. H.; and Yu, Q. L., 2020, “Functionally Graded Ultra-High Performance Cementitious Composite with Enhanced Impact Properties,” Composites Part B: Engineering, V. 183, Feb., Article No. 107680. doi: 10.1016/j.compositesb.2019.107680
Li, Q., and Xu, S., 2009, “Experimental Investigation and Analysis on Flexural Performance of Functionally Graded Composite Beam Crack-Controlled by Ultrahigh Toughness Cementitious Composites,” Science in China Series E: Technological Sciences, V. 52, No. 6, June, pp. 1648-1664. doi: 10.1007/s11431-009-0161-x
Luna Innovations, 2020, “Luna ODiSI 6000 Series: Optical Distributed Sensor Interrogators Data Sheet,” Luna Innovations, Roanoke, VA, 6 pp.
Maalej, M., and Li, V. C., 1995, “Introduction of Strain-Hardening Engineered Cementitious Composites in Design of Reinforced Concrete Flexural Members for Improved Durability,” ACI Structural Journal, V. 92, No. 2, Mar.-Apr., pp. 167-176.
Maalej, M.; Ahmed, S. F. U.; and Paramasivam, P., 2003, “Corrosion Durability and Structural Response of Functionally-Graded Concrete Beams,” Journal of Advanced Concrete Technology, V. 1, No. 3, pp. 307-316. doi: 10.3151/jact.1.307
Moghadam, A. S., and Omidinasab, F., 2020, “Assessment of Hybrid FRSC Cementitious Composite with Emphasis on Flexural Performance of Functionally Graded Slabs,” Construction and Building Materials, V. 250, July, Article No. 118904. doi: 10.1016/j.conbuildmat.2020.118904
Nes, L. G., and Øverli, J. A., 2016, “Structural Behaviour of Layered Beams with Fibre-Reinforced LWAC and Normal Density Concrete,” Materials and Structures, V. 49, No. 1-2, Jan., pp. 689-703. doi: 10.1617/s11527-015-0530-9
Poldon, J. J.; Hoult, N. A.; and Bentz, E. C., 2021, “Understanding Reinforcement Behavior Using Distributed Measurements of Shear Tests,” ACI Structural Journal, V. 118, No. 3, May, pp. 255-266.
Regier, R., and Hoult, N. A., 2014, “Distributed Strain Behavior of a Reinforced Concrete Bridge: Case Study,” Journal of Bridge Engineering, ASCE, V. 19, No. 12, p. 05014007. doi: 10.1061/(ASCE)BE.1943-5592.0000637
Regier, R., and Hoult, N. A., 2015, “Concrete Deterioration Detection Using Distributed Sensors,” Proceedings of the Institution of Civil Engineers – Structures and Buildings, V. 168, No. 2, Feb., pp. 118-126. doi: 10.1680/stbu.13.00070
Rodgers, L., 2018, “Climate Change: The Massive CO2 Emitter You May Not Know About,” BBC News, Dec., https://www.bbc.com/news/science-environment-46455844. (last accessed Sept. 22, 2022)
Sika Group, 2020, “Product Data Sheet: SikaFiber Force 600,” Sika Canada Inc., Pointe-Claire, QC, Canada.
Torelli, G., and Lees, J. M., 2020, “Interface Bond Strength of Lightweight Low-Cement Functionally Layered Concrete Elements,” Construction and Building Materials, V. 249, Article No. 118614, July. doi: 10.1016/j.conbuildmat.2020.118614
Torelli, G.; Fernández, M. G.; and Lees, J. M., 2020, “Functionally Graded Concrete: Design Objectives, Production Techniques and Analysis Methods for Layered and Continuously Graded Elements,” Construction and Building Materials, V. 242, Article No. 118040, May. doi: 10.1016/j.conbuildmat.2020.118040
Villalba, S., and Casas, J. R., 2013, “Application of Optical Fiber Distributed Sensing to Health Monitoring of Concrete Structures,” Mechanical Systems and Signal Processing, V. 39, No. 1-2, Aug.-Sept., pp. 441-451. doi: 10.1016/j.ymssp.2012.01.027
Yager, J.; Hoult, N. A.; and Bentz, E., 2021, “Evaluating the Behaviour of Functionally Graded Reinforced Concrete without Transverse Reinforcement Using Distributed Sensing,” Construction and Building Materials, V. 295, Aug., Article No. 123612. doi: 10.1016/j.conbuildmat.2021.123612
Yang, Y.-S.; Huang, C.-W.; and Wu, C.-L., 2012, “A Simple Image‐Based Strain Measurement Method for Measuring the Strain Fields in an RC‐Wall Experiment,” Earthquake Engineering & Structural Dynamics, V. 41, No. 1, Jan., pp. 1-17. doi: 10.1002/eqe.1111