| 引用本文: | 李柯璇,郑文忠,侯翀驰,王英.约束混凝土受压应力-应变曲线统一方程[J].哈尔滨工业大学学报,2021,53(4):10.DOI:10.11918/202008002 |
| LI Kexuan,ZHENG Wenzhong,HOU Chongchi,WANG Ying.Unified equation of confined concrete stress-strain curve under axial compression[J].Journal of Harbin Institute of Technology,2021,53(4):10.DOI:10.11918/202008002 |
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| 约束混凝土受压应力-应变曲线统一方程 |
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李柯璇1,2,郑文忠1,2,侯翀驰1,2,王英1,2
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(1.结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨 150090;2.土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨 150090)
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| 摘要: |
| 为改善已有约束混凝土本构关系模型的局限性,收集了混凝土强度为19.6～158 MPa,体积配箍率为0.5%～7.27%,箍筋屈服强度为296～1 318 MPa,纵筋配筋率为0%～5.87%的约束混凝土轴压试验数据,建立数据库。分析了7个关键参数对约束混凝土强度增强系数（Kc=fcc/fc）和变形增强系数（Kε=εcc/εc）的影响规律。对数据库中试验数据进行统一处理,采用回归分析的方法,提出了峰值压应变及峰值压应力计算公式,约束混凝土受压应力-应变曲线统一方程。对比分析本文统一方程和已有的本构模型对本课题组试验的预测效果,本文提出的统一方程得到的应力-应变曲线与试验曲线吻合程度更高,本文提出的峰值压应变及峰值压应力公式预测效果好,本文模型精确度高且适用范围广。 |
| 关键词: 约束混凝土 峰值压应力 峰值压应变 受压应力-应变关系 统一方程 |
| DOI：10.11918/202008002 |
| 分类号:TU375.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金面上项目(51678190) |
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| Unified equation of confined concrete stress-strain curve under axial compression |
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LI Kexuan1,2,ZHENG Wenzhong1,2,HOU Chongchi1,2,WANG Ying1,2
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(1.Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, China; 2.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information, Harbin 150090, China)
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| Abstract: |
| To deal with the limitations of the existing constitutive relation models of confined concrete, the experimental results of confined concrete columns were collected to establish a database, including concrete strength of 19.6-158 MPa, volumetric ratio of 0.5%-7.27%, stirrup yield strength of 296-1 318 MPa, and longitudinal reinforcement ratio of 0%-5.87%. The effects of seven key parameters on the strength enhancement factor (Kc=fcc/fc) and deformation enhancement factor (Kε=εcc/εc) of confined concrete were analyzed. Through the unified processing and regression analysis of the data in the database, the unified equation of confined concrete stress-strain curve under axial compression was proposed, and the computation formulas of peak stress and peak strain were obtained. The prediction effects of the proposed unified equation and the existing models were compared and analyzed. Results show that the stress-strain curves obtained by the unified equation were more consistent with the experimental curves. The formulas of peak strain and peak stress had good predictive effect. From the overall verification results, it can be concluded that the model proposed in this paper is highly accurate and widely applicable. |
| Key words: confined concrete peak stress peak strain stress-strain curve unified equation |
