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| 摘要: |
| 用材料破坏过程分析系统MFPA2D(material failure process analysis)数值模拟方法对钢筋混凝土桥墩在偏心加载条件下的受力、变形与内部裂缝萌生、扩展及最终破坏的全过程进行了数值模拟.数值模型中引入了统计分布函数,反映了混凝土的非均匀性影响,并采用具有残余强度的弹脆性本构模型及破坏单元材料性质退化方法,利用偏心加载方式对钢筋混凝土构件实施加载.数值试验得出的荷载-位移曲线及破坏模式图与文献的试验结果较接近,数值试验还给出了试件破坏过程图及应力分布图,再现了整个破坏过程,而且通过对模型中受拉区2个多单元信息剖线的提取,对剖线中不同位置点应力随加载步的变化情况进行了研究和分析,揭示了结构破坏的机理.数值试验结果对于深入了解钢筋和混凝土的联合受力规律有参考价值. |
| 关键词: 数值模拟,破坏过程,钢筋混凝土材料,MFPA2D |
| DOI： |
| 分类号:TU528.571 TB11 |
| 基金项目:国家自然科学基金资助项目(50174013,50374020) |
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| Numerical Simulation of Crack Development in Reinforced Concrete Structures Subjecting Eccentric Loading |
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ZHANG Juan-xia TANG Chun-an WANG Shu-hong LI Lian-chong ZHANG Ya-fang
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| Abstract: |
| A numerical code MFPA~(2D)(material failure process analysis) was used to model the crack initiation and propagation in reinforced concrete bridge pier,which were subjected to eccentric loading.A certain statistical function was introduced to reflect the concrete heterogeneity.The elastic damage constitutive law with residential strength and the elements mechanical properties reducing method were used.The load-displacement response and crack propagation processes simulated with this code show that there is a good agreement with those observed in experiments.It was found that the fractures developed in the concrete observed at the macroscopic level are predominant by tensile damage at the mesoscopic level.The stress distribution curve and the failure process of the sample are reported in this paper.Through picking up two multiple elements information lines from the tensile area,which provide the stress changing information at the different position with the loading step,the structure failure mechanism is displayed which give a basis for the study of the failure process in reinforced concrete under loading and the design of mechanics properties for the reinforced concrete. |
| Key words: numerical simulation,failure process,reinforced concrete material,material failure process analysis(MFPA~(2D)) |
