| 摘要: |
| 通过对不同龄期的施工期混凝土试件进行重复荷载作用下的受压试验，分析了龄期对混凝土受压应力应变全曲线特征参数的影响规律，提出了重复荷载作用下施工期混凝土的动力本构关系的计算模型,探讨了龄期、混凝土强度等级与本构关系计算模型各参数之间的关系.结果表明：随着龄期的延长，混凝土的弹性变形阶段延长，同一应力水平下混凝土的轴向变形减小，混凝土的峰值应力、初始割线模量和峰值点割线模量增加，峰值应变减小，外包络线上升段及下降段更陡峭. |
| 关键词: 混凝土 施工期 重复荷载 动力本构关系 计算模型 |
| DOI：103969/j.issn.1007 9629202006029 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51308441,51678473,51590914）；长江学者和创新团队发展计划（IRT_17R84）；陕西省教育厅重点实验室科研项目（18JS062） |
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| Compressive Stress Strain Relationship of Concrete during Construction under Repeated Loading |
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PENG Gang, HU Xiaopeng, NIU Ditao, WANG Jing
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School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China
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| Abstract: |
| According to the test results of the uniaxial compression experiments on concrete with different ages under repeated loading, the effects of concrete age on the different characteristic parameters of the compressive stress strain curves were analyzed. The computational model for dynamic constitutive relationship of concrete during construction under repeated loading was proposed, and the relationship between concrete age, concrete strength grade and the parameters of constitutive model was discussed. Results show that accompanied by the increasing concrete age, the elastic deformation stage of concrete increased, the axial deformation of concrete decreased at the same loading level, the peak stress, initial secant modulus and secant modulus at peak point increase whereas the peak strain decrease, moreover, the ascending and descending section of the envelope tend to steep. |
| Key words: concrete construction period repeated loading dynamic constitutive relation computational model |
