摘要
为研究冻融作用对钢筋混凝土无箍筋试件黏结强度的影响,引入相应的损伤变量对Hsieh-Ting-Chen四参数混凝土破坏准则进行修正,确定冻融损伤下的混凝土破坏准则,建立冻融环境下黏结失效的理论计算模型。通过对钢筋肋间混凝土在挤压力、摩擦力等作用下的受力分析,给出冻融环境下变形钢筋与混凝土之间极限黏结应力的计算方法及锥面斜角、摩擦因数等参数的取值,详细阐述了极限黏结应力的求解思路。利用已有文献试验结果对该理论计算模型进行验证,结果表明冻融次数在一定范围内计算值与试验值吻合较好,模型精度较高。
The influence of freeze-thaw action on the bond strength between reinforcing steel bars and concrete without stirrups was investigated, and the damage variables were introduced to modify the four-parameter Hsieh-Ting-Chen failure criterion of concrete. Based on it, the failure criterion of concrete in a freeze-thaw environment was determined, and a theoretical model for the bond failure after freezing and thawing was proposed. Based on stress analysis of the concrete corbel between the ribs under normal compressive pressure and friction pressure, a method of calculating the ultimate bond strength between deformed bars and concrete in a freeze-thaw environment was deduced, and the parameters such as the oblique angle on the cone surface and friction coefficient were determined. In addition, the solution procedure of the ultimate bond strength is illustrated in detail. The theoretical model is verified by test results from some existing literatures, and it can be concluded that, within a certain range of freeze-thaw cycles, the calculation results of this model are in good agreement with the test results, and that the accuracy of the model is high.
出处
《水利水电科技进展》
CSCD
北大核心
2013年第1期33-36,44,共5页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51109121
51174291)
中国水利水电科学研究院开放基金(IWHRKF201009)
关键词
混凝土结构
变形钢筋
黏结应力
冻融作用
concrete structure
deformed bar
bond strength
freeze-thaw action
