| 摘要: |
| 探讨了约束混凝土的受压性能，分析了钢管约束混凝土及箍筋约束混凝土侧向约束力的作用机理.基于双剪统一强度理论并结合钢管约束混凝土及箍筋约束混凝土轴压试验数据，建立了约束混凝土统一的峰值应力和峰值应变计算公式，并对其进行了验证.与中国现行规范相结合，提出了约束混凝土统一的实用应力应变本构关系模型，并与试验曲线进行了对比.结果表明：所提出的峰值应力和峰值应变计算公式以及本构关系模型更加精确，并且简单实用，可用于多种约束混凝土构件的非线性分析. |
| 关键词: 约束混凝土 侧向约束力 统一强度理论 峰值应力 峰值应变 本构模型 |
| DOI：10.3969/j.issn.1007 9629.2017.01.009 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51478382）；陕西省自然科学基础研究基金重点项目（2016JZ015）；教育部长江学者和创新团队发展计划（IRT13089） |
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| A Practical Stress Strain Model for Confined Concrete |
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SHI Qingxuan, RONG Chong, ZHANG Ting, WANG Qiuwei
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School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China
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| Abstract: |
| Compression behavior of confined concrete was discussed. Lateral restriction mechanism of steel tube confined concrete and stirrups confined concrete was analyzed. Based on the twin shear unified strength theory and a series of experimental results， the uniform formulas to determine peak stress and peak strain were established and validated. Combining the Chinese current specification， practical stress strain models of confined concrete were proposed and compared with experimental curves. Results show that the proposed formulas to determine peak stress and peak strain are accurate， and the proposed stress strain models are more accurate， simple and useful. The proposed stress strain models can be feasible in the nonlinear analysis of confined concrete. |
| Key words: confined concrete lateral restriction unified strength theory peak stress peak strain stress strain model |
