Fatigue performance of stud connectors in steel-ECC composite structures after salt freeze-thaw cycles: Experimental study and degradation model

IF 7.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI:10.1016/j.engstruct.2026.122320

Fangwen Wu, Zirun Li, Lanqing He, Ao Chen, Haipeng Lei, Jincheng Cao

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Abstract

This paper aimed to investigate the fatigue performance of stud connectors in steel-engineered cementitious composite (ECC) composite structures after salt freeze-thaw cycles (SFTCs). The fatigue tests of eight push-out specimens were conducted and the influence parameters include the fatigue loading amplitude, number of SFTCs and ECC strength grade. Furthermore, the damage mechanisms of specimens after the combined effects of SFTCs and fatigue loading were revealed. The test results showed that the increasing the number of SFTCs and fatigue loading amplitude significantly reduced the fatigue life of specimens, while the plastic slip accumulation and shear stiffness loss rates increased. Compared with the unsalted freeze-thaw specimens, the fatigue life of specimens with strength grade of 50 MPa (ECC50) and 80 MPa (ECC80) subjected to 200 SFTCs decreased by 58 % and 34 %, respectively. Besides, the fatigue life of ECC80 specimens was consistently higher than that of ECC50 specimens, with a minimum fatigue life difference of 6.4 %. Subsequently, the S-N curves with survival probability of 50 % and 95 % were established based on the fatigue test results. Finally, the degradation models were proposed based on the degradation behavior of plastic slip and shear stiffness, with predictive errors typically within 15 %. The findings of this study provide the theoretical foundations for the durability design and fatigue life evaluation of steel-ECC composite structures in cold and saline regions.

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钢- ecc复合结构螺栓接头盐冻融循环疲劳性能试验研究及退化模型

本文旨在研究钢工程胶凝复合材料（ECC）复合结构中螺柱连接件在盐冻融循环（SFTCs）后的疲劳性能。对8个推出试件进行了疲劳试验，影响参数包括疲劳载荷幅值、SFTCs数量和ECC强度等级。在此基础上，揭示了试件在SFTCs和疲劳载荷共同作用下的损伤机理。试验结果表明：随着SFTCs数量和疲劳加载幅值的增加，试件的疲劳寿命显著降低，塑性滑移累积率和剪切刚度损失率增加；与无盐冻融试件相比，强度等级为50 MPa （ECC50）和80 MPa （ECC80）的试件在200次SFTCs作用下的疲劳寿命分别降低了58 %和34 %。ECC80试样的疲劳寿命始终高于ECC50试样，最小疲劳寿命差异为6.4 %。根据疲劳试验结果，分别建立了存活概率为50 %和95 %的S-N曲线。最后，提出了基于塑性滑移和剪切刚度退化行为的退化模型，预测误差一般在15% %以内。研究结果为低温盐碱地钢- ecc复合结构的耐久性设计和疲劳寿命评价提供了理论依据。

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.