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Unified Bond Model for Externally Bonded Reinforcement

外部粘结钢筋的统一粘结模型

基本信息

批准号：
13450177
负责人：
UEDA Tamon
金额：
$ 9.66万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450177/
关键词：
External bonding Shear bond model Tensile bond model Mixed-made debonding Bond strength Effective bond length Punching out capacity Interfacial fracture energy 混合モード剥離剥離破壊エネルギー鉄筋コンクリート連続繊維シート鋼板付着付着-すべり関係剥離接着樹脂

项目摘要

This study presents a unified local bond stress-slip model for interface between concrete and externally bonded reinforcing material (shear bond model). The shear bond model was derived based on a reinforcing material stress-slip relationship at loaded end of pullout bond test, so that necessary measurement was simplified and the data scatter problem was minimized. The shear bond model needs only two material constants, interfacial fracture energy and interfacial ductility factor. The shear bond model was expanded to be bond stress-slip-reinforcing material strain model to express cases with a short bond length. Both original and expanded shear bond models consider effects of mechanical properties of reinforcing materials, adhesive materials and concrete substrate. Besides the shear band model, the prediction formula for interfacial fracture energy, effective bond length and bond strength for given anchorage length are presented. Reliability of the proposed unified shear bond model together with the proposed formula for interfacial fracture energy, effective bond length and bond strength for a given bond length is presented by comparing the calculated results with experimental results.Tension bond model is examined experimentally and it is disclosed that the bond strength (or interfacial fracture energy) is not affected by stiffness of adhesive materials, which is different from the cases of shear bond model. A test method to represent a mixed mode for bond (shear and tension bond) is newly developed. Using this method, an interaction diagram of shear bond strength and tension bond strength is presented, which shows that the shear bond strength is reduced only by 10% even under tension bond stress equal to 90% of the tension bond strength. The theoretical method to calculate punching out capacity of reinforcing material externally bonded in orthogonal direction is also presented.

本文提出了混凝土与外粘结材料界面局部粘结应力-滑移统一模型（剪切粘结模型）。基于拉拔试验加载端钢筋材料的应力-滑移关系，推导出剪切粘结模型，简化了必要的测试，减少了数据分散问题。剪切粘结模型只需要两个材料常数，界面断裂能和界面延性因子。将剪切粘结模型扩展为粘结应力-滑移-加固材料应变模型，以描述粘结长度较短的情况。无论是原剪切粘结模型还是扩展剪切粘结模型，都考虑了加固材料、粘结材料和混凝土基体力学性能的影响。在剪切带模型的基础上，提出了锚固长度一定时界面断裂能、有效粘结长度和粘结强度的预测公式。通过计算结果与试验结果的比较，说明了统一剪切粘结模型的可靠性，以及在给定粘结长度下，界面断裂能、有效粘结长度和粘结强度的计算公式。通过试验验证了拉伸粘结模型，发现粘结强度与界面断裂能、有效粘结长度和粘结强度之间存在着一定的关系。（或界面断裂能）不受粘结材料刚度的影响，这与剪切粘结模型的情况不同。新开发了一种代表粘结（剪切和拉伸粘结）混合模式的试验方法。利用该方法，给出了剪切粘结强度与拉伸粘结强度的交互作用图，表明即使在拉伸粘结应力等于拉伸粘结强度的90%时，剪切粘结强度也仅降低10%。提出了正交方向外贴加固材料抗冲切承载力的理论计算方法。