摘要
【目的】本文旨在揭示热铸锚端头在服役环境下的腐蚀机制和损伤演化规律,明确热铸锚的结构参数和腐蚀时间对钢丝/热铸合金界面的黏结性能的影响。【方法】以单丝锚固试件为研究对象,通过通电加速腐蚀试验,结合三维激光扫描方法研究了试件端面的腐蚀形貌和黏结界面的腐蚀深度分布特征;基于锚固试件拉拔试验,研究了荷载-位移曲线、失效模式和黏结强度分布规律,分析了锚固长度、锚固角度、钢丝直径和通电腐蚀时间对试件界面黏结强度的影响,采用多元线性回归法得到了锚固试件的极限拔出荷载计算公式。【结果】距黏结界面越近,合金端面的腐蚀深度越大;黏结界面处的腐蚀深度服从正态分布,其均值和标准差均随通电腐蚀时间的增长而逐渐增大;增加锚固长度、锚固角度和钢丝直径均会增大试件的黏结强度;随通电腐蚀时间的增长,试件的平均黏结强度显著降低,最大降幅为24.98%;极限拔出荷载的计算值与试验值吻合较好。【结论】热铸锚的端头在长期遭受腐蚀介质侵蚀后,其界面黏结强度快速下降,导致热铸锚的承载能力显著降低。本研究成果可为吊索热铸锚的结构参数和防腐设计提供理论依据。
[Purposes]This paper aims to reveal the corrosion mechanism and damage evolution law of hot-cast anchorage end under the service environment and to clarify the influence of structural parameters and corrosion time on the interfacial bond performance of steel wire/hot-cast alloy.[Methods]An electrified accelerated corrosion test for the monofilament anchorage specimen was conducted.The corrosion morphology of the specimen end surface and the distribution characteristics of the corrosion depth at the bond interface were studied by combining the three-dimension laser scanning method.Based on the pull-out test,the load-displacement curves,failure modes,and bond strength distribution law were studied.The effects of anchorage length,anchorage angle,wire diameter,and electro-erosion time on the bond performance were analyzed.A formula for calculating the ultimate pull-out load of anchorage specimens was obtained using the multiple linear regression method.[Findings]The corrosion depth of the alloy end surface increases when the site is close to the bond interface,and the corrosion depth at the bond interface follows a normal distribution.The mean and standard deviation of the corrosion depth gradually increase with the increase in electro-erosion time.Increasing the anchorage length,anchorage angle,and wire diameter will increase the bond strength of the specimens.As the electro-erosion time increases,the bond strength of the specimen significantly decreases,with a maximum decrease of 24.98%.The calculated ultimate pull-out load results are in good agreement with the experimental results.[Conclusions]After long-term corrosion of the hot-cast anchorage end,the interfacial bond performance decreases rapidly,and the load-bearing capacity of the hotcast anchor decreases significantly.The research results can provide theoretical support for the structural parameters and anticorrosive design of the suspender hot-cast anchor.
作者
周昊
马亚飞
ZHOU Hao;MA Yafei(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《长沙理工大学学报(自然科学版)》
2025年第5期78-88,共11页
Journal of Changsha University of Science & Technology:Natural Science
基金
国家自然科学基金项目(52178107)
湖南省杰出青年科学基金项目(2024JJ2003)。
关键词
桥梁吊索
热铸锚具
性能退化
三维激光扫描
概率特征
bridge suspender
hot-cast anchor
performance degradation
three-dimension laser scanning
probabilistic characteristic
