| 锈蚀工字形型钢与混凝土黏结滑移特性及损伤本构模型研究 |
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| 引用本文： | 王明年,张艺腾,于丽,刘轲瑞,杨恒洪.锈蚀工字形型钢与混凝土黏结滑移特性及损伤本构模型研究[J].土木工程学报,2022,55(1):64-74. |
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| 作者姓名： | 王明年 张艺腾 于丽 刘轲瑞 杨恒洪 |
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| 作者单位： | 1. 西南交通大学交通隧道工程教育部重点实验室，四川成都 610031；2. 西南交通大学土木工程学院，四川成都 610031 |
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| 基金项目： | 国家自然科学基金面上项目(51878567,51878568)； |
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| 摘 要： | 由于海底隧道服役环境中氯离子含量高,初期支护中的工字钢将不可避免产生锈蚀,导致工字钢与混凝土黏结性能下降,严重影响海底隧道支护体系的耐久性.该研究主要目的是研究锈蚀对工字钢与混凝土界面间黏结滑移行为的影响.首先对工字形型钢混凝土试件进行加速锈蚀试验和推出试验,得到试件破坏形态及黏结滑移曲线,在此基础上分析试件的黏结滑移...
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| 关 键 词： | 隧道工程 黏结滑移特性 损伤本构 推出试验 锈蚀工字钢 混凝土 |
Study on bond-slip characteristics and damage constitutive model for interface between corroded I-shaped steel and concrete |
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| Wang Mingnian Zhang Yiteng Yu Li Liu Kerui Yang Henghong.Study on bond-slip characteristics and damage constitutive model for interface between corroded I-shaped steel and concrete[J].China Civil Engineering Journal,2022,55(1):64-74. |
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| Authors: | Wang Mingnian Zhang Yiteng Yu Li Liu Kerui Yang Henghong |
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| Affiliation: | 1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | Subjected to high chloride ion content in the service environment, corrosion of I-shaped steel in primary support of subsea tunnel is inevitable, which leads to the bond degradation of the interface between I-shaped steel and concrete and furthermore seriously affects the durability of subsea tunnel support system. The main objective of this work was to study the effect of corrosion on the bond-slip behavior of the interface between I-shaped steel and concrete. Firstly, the accelerated corrosion test and push out test were carried out on the steel reinforced concrete(SRC) specimens, and the failure mode and bond-slip curves(τ-S) were obtained. On this basis, the bond-slip mechanical properties and energy evolution during the process were analyzed. The experimental results show that:① The failure mode of the specimen is mainly splitting failure, and the bond-slip curve(τ-S) is composed of three stages: the linear ascending stage, the curved ascending stage, and the steep descending stage;② Both the peak bond strength and the corresponding peak slippage show a decreasing trend with the increase of corrosion rate;③ With the increase of corrosion rate, the elastic energy ratio decreases linearly, while the dissipated energy ratio increases linearly, indicating that the greater the corrosion rate of I-shaped steel is, the more serious internal damage I-shaped steel shall have and the lower the energy storage efficiency of the interface shall be. Finally, the bond-slip degradation constitutive model of corroded I-shaped steel-concrete interface is obtained by using the damage statistical theory of Weibull distribution. Since the influence of corrosion rate on the τ-S curve is taken into account, and the model prediction agrees well with the test curve so that it can be applied to the bond-slip study of corroded I-shaped steel-concrete interface. |
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| Keywords: | tunnel engineering bond-slip characteristic damage constitutive model push-out test corroded I-shaped steel concrete |
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