高温后新旧混凝土粘结的剪切性能研究

详细信息

ON SHEAR BEHAVIOR OF NEW-OLD CONCRETE BONDING AFTER EXPOSURE TO HIGH TEMPERATURE

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Liaoning Dalian 116024, China;2. Department of Environment & Conservation Engineering, Zhengzhou University, Henan Zhengzhou 450002, China

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.
- 混凝土 /
- 剪切性能 /
- 高温 /
- 新旧混凝土粘结 /
- 神经网络
Abstract: This paper presents the direct shear tests of 129 Z shape new-old concrete bond specimens to study bond shear strength. Two types of specimen are considered: bonding before heating and heating before bonding. The influencing factors such as temperature (25℃-900℃), 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 present systematic investigation of bond surface behavior of new-old concrete after exposure to high temperature may provide references for engineering application.
- concrete /
- shear property /
- high temperature /
- new-old concrete bond /
- neural net

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State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Liaoning Dalian 116024, China;2. Department of Environment & Conservation Engineering, Zhengzhou University, Henan Zhengzhou 450002, China