| 唐国斌,项贻强.钢筋混凝土梁开裂面的力学性能和数值模拟[J].水利学报,2015,46(1): |
| 钢筋混凝土梁开裂面的力学性能和数值模拟 |
| Mechanical properties and numerical simulation of crack interface in reinforced concrete |
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| DOI： |
| 中文关键词: 钢筋混凝土 开裂 非线性 骨料咬合 销栓作用 |
| 英文关键词: reinforced concrete crack nonlinear aggregate interlock dowel action |
| 基金项目: |
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| 摘要点击次数: 3362 |
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| 中文摘要: |
| 基于混凝土材料细观层次的研究，对钢筋混凝土梁开裂面的力学性能进行了分析和数值模拟。引入开裂面法向和切向的应力-应变关系假定，模拟了裂缝出现后开裂面由于骨料咬合和微裂缝嵌入的互制作用；采用弹性地基梁理论分析了钢筋销栓作用对开裂面应力传递的影响；在此基础上，基于开裂区应变分解思想，采用等效连续模型将开裂面和裂缝间混凝土统一，将裂缝的影响隐含在等效的本构模型及相关参数中，并给出了开裂单元的屈服准则、加卸载准则及增量型有限元中本构矩阵的数值计算方法。典型构件的试验结果验证了本文数值模型的合理性和有效性。 |
| 英文摘要: |
| Based on the research achievements of microscopic-level concrete material， a numerical simulation of mechanical properties of concrete interface for reinforced concrete was presented in the study. By introducing the stress-strain relationship in normal and tangential directions， the coupling effects in crack interface caused by aggregate interlock and embedded micro-fracture were simulated. The effect of dowel action of reinforcement on interface stress transfer was analyzed by using the elastic foundation theory. Then a uniform continuous crack model and its constitutive matrix were developed to equalize the crack interface and concrete between cracks according to the strain decomposition theory， which represented that the effect of cracks was included in the proposed equivalent constitutive matrix. The yield criteria，loading and unloading criteria， and numerical method of the equivalent constitutive matrix were also described in detail. It is concluded that the numerical results obtained by the presented method for reinforced concrete box beam in available literatures are in good agreement with the test results. |
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