摘要
对先粘结后高温与先高温后粘结两种类型的129块Z形新旧混凝土粘结试件进行了直剪试验,主要考察了温度(常温到900℃)、冷却方式、界面粗糙度和界面剂对粘结面剪切性能的影响。在此基础上,得到了粘结面的剪切滑移曲线,给出了相应的统一计算公式,并建立了先高温后粘结类型的神经网络预测模型,较为系统地对高温后新旧混凝土粘结面的剪切性能进行了研究,以供工程参考。
This paper presents the direct shear tests of 129 Z shape new-old concrete bond specimens to study bond shear strength. Two types of the specimen are considered: bonding before heating and heating before bonding. The influencing factors such as temperature (25°C-900°C), cooling way, interface roughness and interface adhesive agent on bond shear property are studied. Based on the tests, the paper presents the shear stress -slipping curves of bonding interface and the corresponding unified calculation formula. In addition, a neural net predication model is established for the heating before bonding type specimens. The systematic investigation of bond surface behavior of the new-old concrete after exposure to high temperature may provide references for engineering application.
出处
《工程力学》
EI
CSCD
北大核心
2004年第4期133-138,共6页
Engineering Mechanics
基金
国家自然科学基金资助项目(59778045)
关键词
混凝土
剪切性能
高温
新旧混凝土粘结
神经网络
Bonding
Concretes
Interfaces (materials)
Neural networks
Shear strength
