| 摘要: |
| 以双K断裂理论为基础，基于标准钢筋混凝土三点弯曲梁断裂特性，推导了非标准钢筋混凝土三点弯曲梁断裂参数计算公式.开展了非标准钢筋混凝土三点弯曲梁试件断裂试验，研究了其断裂参数的变化规律.结果表明：试件荷载值随试件高度的增加而增大；而试件的亚临界扩展相对值、断裂韧度、起裂断裂韧度和失稳断裂韧度均不随试件高度的增加而变化，可认为是常数. |
| 关键词: 三点弯曲梁 双K断裂韧度 断裂试验 断裂特性 |
| DOI：103969/j.issn1007 9629201505003 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51325904，51279111，51309163，51409162)；江苏省自然科学基金资助项目(BK20140081)；中国博士后科学基金资助项目(2014M551624)；江苏省博士后科研资助计划项目(1302055B) |
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| Double K Fracture Characteristics of Three Point Bending Beams of Non standard Reinforced Concrete |
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FAN Xiangqian1, HU Shaowei1, ZHU Haitang2, LU Jun1
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1.Nanjing Hydraulic Research Institute, Nanjing 210024, China;2.School of Water Conservancy & Environment, Zhengzhou University, Zhengzhou 450001, China
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| Abstract: |
| Fracture test of three point bending beams of non standard reinforced concrete was carried out. The fracture characteristics of three point bending beams of non standard reinforced concrete were studied systematically. Results indicate that the initial load and the maximum load increase with the increase of specimen height. The precritical crack propagation length relative value is independent of specimen height. Similar to the double K fracture toughness, both the initiation fracture toughness and the unstable fracture toughness are not change with the increase of specimen height, which can be regarded as constants to three point bending beams of non standard reinforced concrete. |
| Key words: three point bending beam double K fracture toughness fracture test fracture characteristic |
