PE-ECC构件冻融循环后承载性能试验研究

张志强; 张康健; 刘征

doi:10.13238/j.issn.1004-2954.202501210004

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PE-ECC构件冻融循环后承载性能试验研究

本刊特稿 | 更新时间：2025-08-08

- PE-ECC构件冻融循环后承载性能试验研究
- Experimental Study on Load-Bearing Capacity of PE-ECC Members after Freeze-Thaw Cycles
- 铁道标准设计 2025年69卷第8期页码：1-11
- 作者机构：
  
  1.西南交通大学极端环境岩土与隧道工程智能建养全国重点实验室，成都　610031
  2.西南交通大学土木工程学院，成都　610031
- 作者简介：
  
  张志强（1968—），男，教授，博士生导师，工学博士，主要从事隧道与地下工程研究工作，E-mail：clarkchang68@163.com。
- 基金信息：
  
  国家自然科学基金项目(52378414)
- DOI：10.13238/j.issn.1004-2954.202501210004
  中图分类号： U25;TU375
- 收稿：2025-01-21，
  
  修回：2025-03-07，
  
  网络首发：2025-03-27，
  
  纸质出版：2025-08-20
- 稿件说明：
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张志强, 张康健, 刘征. PE-ECC构件冻融循环后承载性能试验研究[J]. 铁道标准设计, 2025,69(8):1-11.

ZHANG Zhiqiang, ZHANG Kangjian, LIU Zheng. Experimental Study on Load-Bearing Capacity of PE-ECC Members after Freeze-Thaw Cycles[J]. Railway Standard Design, 2025, 69(8): 1-11.
张志强, 张康健, 刘征. PE-ECC构件冻融循环后承载性能试验研究[J]. 铁道标准设计, 2025,69(8):1-11. DOI： 10.13238/j.issn.1004-2954.202501210004.

ZHANG Zhiqiang, ZHANG Kangjian, LIU Zheng. Experimental Study on Load-Bearing Capacity of PE-ECC Members after Freeze-Thaw Cycles[J]. Railway Standard Design, 2025, 69(8): 1-11. DOI： 10.13238/j.issn.1004-2954.202501210004.

摘要

为研究冻融循环作用对聚乙烯纤维工程水泥基复合材料（PE-ECC）构件承载力的影响，通过室内冻融循环试验和冻后四点弯曲试验，研究冻融循环作用下PE-ECC梁的破坏演化特征，并通过刚度、延性指数、能量吸收能力（EAC）等性能指标分析其承载性能劣化规律。结果表明：（1）试验梁在破坏时保持较好的完整性，冻融作用使PE纤维与基体的协同效应减弱，随着冻融循环次数增加，主裂缝数量减少，裂缝密度降低，分布更加分散；（2）试验梁的荷载-跨中挠度曲线呈现明显的弹性、屈服和破坏段，加载过程可分为弹性阶段、受拉区局部开裂阶段和屈服破坏阶段；（3）提高PE纤维含量可使基体结构更为紧密，降低冻融作用后的EAC损失并提升承载能力；（4）冻融循环后，PE-ECC试验梁跨中截面应变分布仍符合平截面假定，提出PE-ECC梁在弯曲荷载作用下各阶段承载力计算方法。研究成果可为PE-ECC梁的承载力设计和在寒区工程中的应用提供依据。

Abstract

This study aims to investigate the effects of freeze-thaw cycles on load-bearing capacity of polyethylene fiber-reinforced engineered cementitious composites (PE-ECC) members. Through laboratory freeze-thaw cycle tests and post-freeze four-point bending tests

the failure evolution characteristics of PE-ECC beams under freeze-thaw action were investigated. The degradation patterns of their load-bearing capacity were analyzed using performance indicators such as stiffness

ductility index

and energy absorption capacity (EAC). The experimental results showed that: (1) the test beams maintained good structural integrity upon failure. Freeze-thaw cycles weakened the synergy between PE fibers and the matrix. With increasing freeze-thaw cycles

both the number of primary cracks and crack density decreased

and the cracks became more widely distributed. (2) The load-midspan deflection curves showed distinct elastic

yielding

and failure segments

which could be categorized into three loading stages: elastic stage

localized cracking stage in the tensile zone

and yielding failure stage. (3) Increasing PE fiber content resulted in a denser matrix structure

reduced the EAC loss

and enhanced load-bearing capacity after freeze-thaw cycles. (4) The strain distribution at the midspan cross-section of PE-ECC test beams after freeze-thaw cycles remained consistent with the plane section assumption. A calculation method for the load-bearing capacity of PE-ECC beams at each stage under bending load was proposed. These findings can provide a basis for the load-bearing capacity design of PE-ECC beams and their engineering applications in cold regions.

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references

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