[关键词]
[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所在。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天、10天、15天的加速湿热老化,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,最后建立了考虑温度、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良好,论文结果为指导粘钢加固混凝土结构的设计以及耐久性理论研究提供参考依据。
[Key word]
[Abstract]
The interface performance between steel plate and concrete is the key to strengthened concrete structure. In this paper, there were 27 specimens carried out for steel plate bonded concrete under hydrothermal environment. And accelerated hydrothermal aging was respectively conducted in 5 days, 10 days and 15 days. 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. The results of the paper provide reference for the design of the concrete structure with bonded steel plate and the durability theory.
[中图分类号]
TU511.352
[基金项目]
国家重大科研仪器研制项目(11627802)、国家自然科学基金(51478071)、交通运输部建设科技项目(2015318814190) 、重庆市基础与前沿研究计划重点项目(cstc2015jcyjBX0022)
