1 Key Laboratory of C & PC Structures Ministry of Education, National and Local Unified Engineering Research Center for Basalt Fiber Production and Application Technology, Southeast University, Nanjing 211189, China
2 College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
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文章历史+
Received
Published
Revised
2025-10-24
2026-07-28
2026-01-19
Online Date
2026-08-14
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摘要
为提高环境-荷载耦合作用下BFRP拉索疲劳寿命预测的准确性,开展了不同应力比下的BFRP拉索的疲劳试验,获得了破坏模式、S-N曲线,阐明了破坏模式随应力比的演变机制:从低应力比的“纤维断裂”主导,到高应力比的“界面剥离和磨损”主导。评价了5种典型等寿命(constant life diagram,CLD)模型,提出了一种改进的疲劳寿命预测方法:通过理论推导,将二维CLD模型与S-N曲线的幂函数模型相结合,构建了表征疲劳寿命、应力幅值与应力均值三者关系的三维等寿命曲面。结果表明:在低应力比(纤维断裂主导失效)工况下,该模型的预测误差为1.37%~10.1%,达到了较高的精度水平。
Abstract
To enhance the accuracy of fatigue life prediction for BFRP tendons under combined environmental and loading conditions, fatigue tests were conducted on BFRP tendons at different stress ratios. The failure modes and S-N curves were obtained, and the evolution mechanism of failure modes with varying stress ratios was elucidated: transitioning from “fiber breakage” dominance at low stress ratios to “interfacial debonding and wear” dominance at high stress ratios. Five typical constant life diagram (CLD) models were evaluated, and an improved fatigue life prediction method was proposed. Through theoretical derivation, a two-dimensional CLD model was integrated with the power function model of S-N curves to construct a three-dimensional constant life surface characterizing the relationships among fatigue life, stress amplitude, and mean stress. The results demonstrate that under low stress ratio conditions where fiber breakage dominates the failure, the prediction error of this model ranges from 1.37% to 10.1%, achieving a high level of accuracy.
LIU Xia, WANG Xin, ZHOU Jing-yang, XIE Jia-zhan, LI Feng, WU Zhi-shen.
Fatigue Life Prediction of BFRP Tendons under Combined Environmental and Loading Conditions Based on Constant Life Diagram[J].
Science Technology and Engineering, 2026, 26(21): 9064-9071 DOI:10.12404/j.issn.1671-1815.2507429
现以环境-荷载耦合作用下BFRP拉索疲劳测试为研究对象,通过测试不同应力比下的BFRP拉索疲劳S-N曲线,基于实验数据建立5种典型等寿命(constant life diagram,CLD)模型,包括Goodman模型[16]、线性CLD模型[17]、分段线性CLD模型[18]、Harris模型[19-20]和Kawai模型[21]。通过二维等寿命模型和S-N曲线的幂函数模型进行理论公式推导,构建疲劳寿命-应力幅值-应力均值之间的三维关系曲面,全面表征影响BFRP拉索性能的各项参数。通过与传统试验方案的试验及计算结果进行对比分析,验证本文方法的可靠性以及准确性,为环境-荷载耦合作用下BFRP拉索的安全设计及使用提供参考。
为了进行模型对比,引入3个评价指标[27]:平均误差(mean average percentage error,MAPE);平均归一化偏差(mean normalized bias,MNB);均方根误差(root mean squared percentage error,RMSPE),具体表达式如下。
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