| 李庆斌,吕培印,张立翔.混凝土受压疲劳特性及损伤本构模型[J].水利学报,2004,35(4):0021-0026 |
| 混凝土受压疲劳特性及损伤本构模型 |
| Damage constitutive model for performance degradation of concrete due to compressive fatigue load |
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| DOI： |
| 中文关键词: 混凝土 疲劳 损伤 性能退化 边界面 本构模型 |
| 英文关键词: concrete fatigue damage performance degradation boundary surface constitutive model |
| 基金项目: |
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| 中文摘要: |
| 基于边界面概念和损伤力学理论，建立了混凝土受压各向异性损伤模型。加载面、边界面方程均以损伤能量释放率表示。在能量释放率空间内，由加载面与初始损伤面、边界面之间的位置描述损伤状态。通过建立累积损伤与相应循环损伤能量释放率阈值之间的关系，确定了疲劳加载中极限断裂面的变化规律。利用变形唯一性假定，得到混凝土疲劳与单调加载的损伤量及应力应变之间的关系，为从全过程研究经历多种形式加载的混凝土性能退化规律奠定了基础。完成了混凝土单调加载、单级疲劳和多级疲劳继而单调加载试验，得到了模型中的参数。经比较，模型计算与试验结果吻合较好。 |
| 英文摘要: |
| An anisotropic damage model for concrete subjected to compressive fatigue load is developed based on continuum damage mechanics and the concept of boundary surface. The equations of loading surface and boundary surface are expressed in strain-energy releasing rate. The damage state in various levels is described by the position at the interface among the loading surface, incipient damage surface and boundary surface in the energy releasing space. The variation law of the ultimate breaking surface is determined according to the relationship between cumulative damage and the energy releasing rate threshold. Based on the uniqueness assumption of deformation, the relationships among concrete fatigue, concrete damage due to monotonic cyclic load and stress-strain are obtained. This result helps to clarify the law of performance degradation of concrete experienced various loading history. The parameters of the model are obtained by means of monotonic compressive, single state fatigue and multi-stage fatigue combining with monotonic compressive tests. The calculation result of the model is in good agreement with experimental data. |
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