摘要
根据拔出试验中横向压力的施加方式和钢筋类型,提出了横向压力上限值的计算方法。基于钢筋与混凝土界面应力场的分布,分析了各应力分量可能对混凝土带来的损伤;分析了材料常数、横向压力作用方式和钢筋外形等参数对横向压力上限值的影响;与试验结果的对比表明,建议方法具有一定适用性。研究表明:单轴受压情况更易使混凝土产生受拉损伤,特别是采用带肋钢筋时,破坏形式更倾向于劈裂破坏;双轴受压(围压)作用下混凝土易产生受压损伤,而且所能承受的横向荷载一般高于单轴受压情况;传统的宏观试验研究方法由于不能及时发现钢筋与混凝土界面的损伤,可能会过高估计横向压力的上限值,围压情况下尤为显著。建议算法作为传统试验研究的补充,理论依据充分、计算简便,可供工程设计人员参考。
According to the exertion patterns of lateral pressure and the types of rebar in the pull-out tests, a calculation method for the upper limit value of lateral pressure was proposed. Based on the stress fields near the bar-to-concrete interface, the possible damage of concrete caused by the stress components was analyzed. The influencing parameters such as material constants, patterns of lateral pressure and the shapes of rebar on the upper limit of lateral pressure were studied in detail. Comparison with experimental results proves that the method presented in this paper has certain applicability. Research shows that uniaxial lateral pressure is more likely to cause tensile damage of concrete, especially when ribbed bars are used, and the specimen is more prone to splitting failure in this case;biaxial compression(confining pressure) is more likely to cause compression damage of concrete, and concrete can withstand higher lateral pressure than when it is subjected to uniaxial compression. Traditional macroscopic test methods may overestimate the upper limit value of lateral pressure due to the failure to detect the damage of bar-to-concrete interface in time, especially under confining pressure conditions. As a supplement to the traditional experimental study, the proposed method is with sufficient theoretical basis as well as convenience in calculation, and can be referenced by engineering designers.
作者
赵卫平
雷永旺
赵芷迎
朱彬荣
王丹
ZHAO Weiping;LEI Yongwang;ZHAO Zhiying;ZHU Binrong;WANG Dan(School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2019年第1期140-147,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51474218)
教育部中央高校基本科研业务费专项(2011QL05)
关键词
钢筋混凝土结构
黏结
横向压力
界面
应力集中
reinforced concrete structure
bond
lateral pressure
interface
stress concentration
作者简介
赵卫平,出生于1981年,男,工学博士,副教授,主要从事钢筋混凝土非线性分析研究。E-mail:zhaowp@cumtb.edu.cn.
