- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
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| Citation: | LI Fuhai, YANG Zongchi, LIU Gengyuan, LIU Menghui, WU Haonan, CHEN Zhao, LI Guhua. Flexural Performance of PP-ECC Beams Under Coupling of Freeze-Thaw Cycles and Bending Loads[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220645
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To investigate the effect of freeze-thaw cycles and coupling of freeze-thaw cycles and bending loads on the flexural performance of polypropylene fiber cement-based composite (PP-ECC) beams, seven experimental working conditions were set up. In addition, the three-point loading method was adopted to explore the flexural performance of PP-ECC beams. The differences in load-span deflection curves, flexural bearing capacity, and crack development patterns of PP-ECC beams under coupling of freeze-thaw cycles and bending loads were analyzed. Based on the calculation assumptions and the calculation model of the flexural bearing capacity of PP-ECC beams under normal environments, combined with the freeze-thaw deterioration mechanism of PP-ECC materials, the calculation model of flexural bearing capacity of PP-ECC beams under freeze-thaw environments was deduced. Furthermore, the load-bearing damage coefficient γ was introduced on this basis. The calculation model of the flexural bearing capacity of PP-ECC beams under the coupling of freeze-thaw cycles and bending loads was established. The research results show that the ultimate flexural bearing capacity of PP-ECC beams with different load-bearing ratios decreases to varying degrees under freeze-thaw cycles. After 500 freeze-thaw cycles, the ultimate flexural bearing capacity of PP-ECC beams with load-bearing ratios of 0, 0.25, and 0.5 decreases by 28.70%, 27.09%, and 35.69%, respectively. After cracking under tension, the PE-ECC material can still work with the rebar under tension and participate in the stress of the whole section. When the PP-ECC beam reaches the limit state, the zone under tension develops steadily with multiple cracks. With the aggravation of freeze-thaw damage, the width of the largest crack in the beam body increases, and the number of cracks decreases. The PP-ECC beam subjected to freeze-thaw cycles and coupling of freeze-thaw cycles and bending loads still satisfies the plane section assumption. The coincidence degree of the flexural bearing capacity calculation models of PP-ECC beams under freeze-thaw cycles and coupling of freeze-thaw cycles and bending loads established based on the plane section assumption reaches 0.88–1.06 and 0.96–1.10, respectively.
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