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湿热环境下粘钢加固混凝土界面的粘结性能
姚国文1,2, 刘宇森1,2, 吴甜宇3, 李世亚1,2
1.重庆交通大学 山区桥梁与隧道工程国家重点实验室培育基地;2.土木工程学院, 重庆 400074;3.大连理工大学 土木工程学院, 辽宁 大连 116023
摘要:
钢板-混凝土界面粘结性能是粘贴钢板加固混凝土结构的关键。通过对湿热环境下27个钢板-混凝土试件进行试验研究,分别进行5、10、15 d的加速湿热老化,然后进行双剪试验,获得了钢板-混凝土界面发生剪切剥离破坏过程中的极限荷载、钢板应变分布及荷载-位移关系。分析了环境温度、湿度耦合作用对钢板-混凝土界面粘结耐久性能的影响,并综合考虑钢板-混凝土的粘结破坏模式、受力过程、粘结界面相对位移发展规律,提出了粘结界面剪应力、滑移与温度和湿度相关的表达式。建立了考虑温度、湿度影响的粘结-滑移本构关系模型,数值模拟结果与试验结果吻合较好。
关键词:  粘贴钢板  湿热环境  耐久性能  粘结滑移本构关系模型
DOI:10.11835/j.issn.2096-6717.2019.078
分类号:TU511.352
基金项目:国家自然科学基金(11627802、51478071);国家重点研发计划(2017YFC0806001)。
Bond behavior study on interface between steel plate and bonded concrete under hydrothermal environment
Yao Guowen1,2, Liu Yusen1,2, Wu Tianyu3, Li Shiya1,2
1.State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering;2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China;3.School of Civil Engineering, Dalian University of Technology, Dalian 116023, Liaoning, P. R. China
Abstract:
The interface performance between steel plate and concrete is the key to strengthened concrete structure. Firstly, a total of 27 specimens for steel plate bonded concrete under hydrothermal environment were carried out in this study. The accelerated hydrothermal aging was conducted in 5 days, 10 days and 15 days, respectively. Then, the double-shear test was performed to obtain the ultimate load, strain distribution and relationship of load-displacement during the shear failure process on steel plate-concrete interface. After long term temperature and humidity coupling, the durability of the steel plate-concrete interface was studied. Considering the analysis of bond failure mode, loading process and the relative displacement evolution on bonding interface, the expression of shear stress and slip was proposed, which was related to temperature and humidity. Finally, the bond-slip constitutive model was established in consideration of the temperature and humidity. The numerical simulation results were in good agreement with the experimental results.
Key words:  bonded steel plate  hydrothermal environment  durability  bond-slip constitutive model
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