论文标题：Frost heaving behavior and mechanical deterioration of prestressed concrete

期刊：Frontiers of Structural and Civil Engineering

作者：Xiguang LIU, Huimin ZHANG, Jingxi PENG, Yao LV, Ditao NIU

发表时间： 10 Mar 2025

DOI：10.1007/s11709-025-1188-1

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文章亮点/Highlights

冻融损伤（FT）会使预应力混凝土（PC）结构冻胀开裂、预应力筋应变减少，严重影响结构安全。

本文通过试验研究了冻融环境下，具有粘结力的后张法预应力混凝土构件的冻胀特性与力学性能的劣化。通过试验构件在300次冻融循环过程中的长度方向应变变化，分析了冻融循环次数和应力水平对混凝土冻胀应变及预应力筋应变损失的影响。

结果表明：随着冻融循环次数的增加，混凝土冻胀应变、残余应变及预应力筋应变损失均会增大；随着应力水平的提高，预应力对混凝土冻胀开裂的作用从抑制转变为加剧。综合冻融循环次数和应力水平的影响，建立了构件的应变损失模型，该模型计算预测与试验结果相符。

实验数据与理论模型对比：（a）m = 0.1;（b）m = 0.2;（c）m = 0.4

摘要/Abstract

Freeze–thaw (FT) damage can cause frost heaving and cracking of prestressed concrete (PC) structures, and a decrease in the strain of prestressing tendon, which seriously affects the safety of the structures. An experimental study was conducted to investigate the frost heaving behavior and mechanical deterioration of bonded post-tensioned PC components in an FT environment. The strain variations along the length of the components during 300 freeze–thaw cycles (FTCs) were obtained, and the effects of FTCs and stress levels on concrete frost heaving strain and prestressing tendon strain loss were analyzed. The results indicated that with increasing FTCs, the concrete frost heaving strain, the residual strain, and the loss of the prestressing tendon strain all increased. As the stress level rose, the effect of prestress forces on the concrete frost cracking from inhibition switched to aggravation. Considering the effects of FTCs and stress levels, a strain loss model for the components was established, and it was in good agreement with the experimental results.

关键词/Keywords

prestressed concrete components; freeze–thaw cycles; stress level; frost heaving strain

引用信息/Citation Information

Xiguang LIU, Huimin ZHANG, Jingxi PENG, Yao LV, Ditao NIU. Frost heaving behavior and mechanical deterioration of prestressed concrete. Front. Struct. Civ. Eng., 2025, 19(6): 859–871 https://doi.org/10.1007/s11709-025-1188-1

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https://doi.org/10.1007/s11709-025-1188-1

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