Performance of uPVC RC-filled Pipe Columns exposed to Thermal Cyclic Loading
Received: 7 December 2024 | Revised: 5 January 2025 | Accepted: 12 January 2025 | Online: 3 April 2025
Corresponding author: Joshua Musonda
Abstract
This study analyzes the performance of unplasticized Polyvinyl Chloride (uPVC) RC-filled pipe columns when exposed to thermal cyclic loading. The exposure simulates hot environments with a peak temperature of 60 °C for 28, 56, and 112 days of Heating-Cooling Cycles (HCC). The experimental analysis focuses on uPVC residual strength after thermal cyclic loading and load-carrying capacity, ductility, and stress-strain behavior of uPVC RC-filled pipe columns. Tensile tests of extracted uPVC specimens after exposure demonstrated no change in ultimate tensile strength but a progressive decline in elastic modulus, reducing by 17.24% and 24.56% after 28 and 56 cycles, respectively. The uPVC confined exposed samples exhibited an initial increase in load-carrying capacity by a factor of 1.39 compared to the unexposed unconfined samples at ambient temperature. However, this increase was followed by a gradual decline to 1.32 and 1.26 at 56 and 112 cycles, respectively. Despite this, the load-bearing capacity of the confined samples was still higher than that of the unexposed, confined samples. Thermal cycling significantly reduced maximum lateral and axial strain at failure by up to 85% at 112-HCC, with ductility declining by 50.9% at 28 cycles and continuing to decrease gradually at higher cycles. Failure modes shifted from ductile in confined unexposed samples to brittle and explosive in thermally cycled samples, highlighting reduced confinement effectiveness. Predictive models demonstrated a high degree of accuracy in estimating peak strength and strain, with average absolute errors of 0.16% and 7.65%, respectively. Long-term projections suggest that confinement effectiveness could decrease to 1.06, which is the ratio of confined exposed strength (fccx) to unconfined unexposed strength (fco) after 50 years of thermal exposure, emphasizing the necessity for enhanced design guidelines to optimize the performance of uPVC-confined RC columns in fluctuating temperature environments, particularly in consideration of thermal cyclic loading.
Keywords:
exposed, unexposed confined composite RC-column, thermal cyclic load, peak strength and strain, heating-cooling cyclesDownloads
References
M. C. Wang and C. W. Hsieh, "Collapse Load of Strip Footing Above Circular Void," Journal of Geotechnical Engineering, vol. 113, no. 5, pp. 511–515, May 1987.
M. Kiyosumi, O. Kusakabe, and M. Ohuchi, "Model Tests and Analyses of Bearing Capacity of Strip Footing on Stiff Ground with Voids," Journal of Geotechnical and Geoenvironmental Engineering, vol. 137, no. 4, pp. 363–375, Apr. 2011.
A. A. Lavasan, A. Talsaz, M. Ghazavi, and T. Schanz, "Behavior of Shallow Strip Footing on Twin Voids," Geotechnical and Geological Engineering, vol. 34, no. 6, pp. 1791–1805, Dec. 2016.
D. Saadi, K. Abbeche, and R. Boufarh, "Model experiments to assess effect of cavities on bearing capacity of two interfering superficial foundations resting on granular soil," Studia Geotechnica et Mechanica, vol. 42, no. 3, pp. 222–231, Jun. 2020.
Y. Xiao, M. Zhao, and R. Zhang, "Seismic bearing capacity for strip footings above voids in cohesive-frictional soils," Earthquake Spectra, vol. 39, no. 1, pp. 269–287, Feb. 2023.
R. Zhang, M. Feng, Y. Xiao, and G. Liang, "Seismic Bearing Capacity for Strip Footings on Undrained Clay with Voids," Journal of Earthquake Engineering, vol. 26, no. 9, pp. 4910–4923, Jul. 2022.
V. B. Chauhan, P. Kumar, and S. Keawsawasvong, "Limit Analysis Solution for Ultimate Bearing Capacity of Footing Resting on the Rock Mass with a Circular Void Subjected to Line Loading," Indian Geotechnical Journal, vol. 53, no. 2, pp. 334–347, Apr. 2023.
J. M. Rouchi and M. A. Nozari, "Effect of Twin Circular Underground Voids on Bearing Capacity of Strip Foundations," European Journal of Engineering Science and Technology, vol. 6, no. 2, pp. 1–13, 2023.
S. N. Moghaddas Tafreshi, O. Khalaj, and M. Halvaee, "Experimental study of a shallow strip footing on geogrid-reinforced sand bed above a void," Geosynthetics International, vol. 18, no. 4, pp. 178–195, Aug. 2011.
A. Asakereh, S. N. Moghaddas Tafreshi, and M. Ghazavi, "Strip footing behavior on reinforced sand with void subjected to repeated loading," International Journal of Civil Engineering, vol. 10, no. 2, pp. 139–152, Jun. 2012.
A. Benbouza, T. Mansouri, and K. Abbeche, "Behavior of Strip Footing/s above Void in Sandy Soil," Engineering, Technology & Applied Science Research, vol. 13, no. 1, pp. 10039–10044, Feb. 2023.
B. Mazouz, K. Abbeche, A. Abdi, and M. Baazouzi, "Model experiments to assess effect of eccentric loading on the ultimate bearing capacity of a strip footing near a dry sand slope," International Journal of Geotechnical Engineering, vol. 15, no. 10, pp. 1241–1251, Nov. 2021.
R. Benali, B. Mazouz, A. A. Belkadi, T. Mansouri, and K. Goudjil, "Drained Bearing Capacity of Strip Footings on Two-Layered Sand Soil Slope," Engineering, Technology & Applied Science Research, vol. 14, no. 5, pp. 16653–16659, Oct. 2024.
A. Abdi, K. Abbeche, B. Mazouz, and R. Boufarh, "Bearing Capacity of an Eccentrically Loaded Strip Footing on Reinforced Sand Slope," Soil Mechanics and Foundation Engineering, vol. 56, no. 4, pp. 232–238, Sep. 2019.
T. Mansouri, R. Boufarh, and D. Saadi, "Effects of underground circular void on strip footing laid on the edge of a cohesionless slope under eccentric loads," Soils and Rocks, vol. 44, May 2021, Art. no. e2021055920.
B. Mazouz, T. Mansouri, M. Baazouzi, and K. Abbeche, "Assessing the Effect of Underground Void on Strip Footing Sitting on a Reinforced Sand Slope with Numerical Modeling," Engineering, Technology & Applied Science Research, vol. 12, no. 4, pp. 9005–9011, Aug. 2022.
B. Azeddine and M. Abdelghani, "The cavity’s effect on the bearing capacity of a shallow footing in reinforced slope sand," Soils and Rocks, vol. 46, Jan. 2023, Art. no. e2023003622.
C. Yoo, "Laboratory investigation of bearing capacity behavior of strip footing on geogrid-reinforced sand slope," Geotextiles and Geomembranes, vol. 19, no. 5, pp. 279–298, Jul. 2001.
E. Sawwaf and M. A, "Strip Footing Behavior on Pile and Sheet Pile-Stabilized Sand Slope," Journal of Geotechnical and Geoenvironmental Engineering, vol. 131, no. 6, pp. 705–715, Jun. 2005.
K. Ueno, K. Miura, and Y. Maeda, "Prediction of Ultimate Bearing Capacity of Surface Footings with Regard to Size Effects," Soils and Foundations, vol. 38, no. 3, pp. 165–178, Sep. 1998.
A. Badie and M. C. Wang, "Stability of Spread Footing Above Void in Clay," Journal of Geotechnical Engineering, vol. 110, no. 11, pp. 1591–1605, Nov. 1984.
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Copyright (c) 2025 Joshua Musonda, John Nyiro Mwero, Kepha Abongo
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