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| 应变局部化弹黏塑性分析的内嵌局部软化带模型 | |
| 引用本文： | 刘金龙,陈胜宏,解家毕,鲍轶洲.应变局部化弹黏塑性分析的内嵌局部软化带模型[J].岩土力学,2008,29(3):823-827. |
| 作者姓名： | 刘金龙 陈胜宏 解家毕 鲍轶洲 |
| 作者单位： | 1. 广州市建设科技委员会办公室,广州,510030;武汉大学,水资源与水电工程科学国家重点实验室,武汉,430072 2. 武汉大学,水资源与水电工程科学国家重点实验室,武汉,430072 3. 中国水利水电科学研究院,防洪减灾研究所,北京,100038 4. 广州市中心区交通项目领导小组办公室,广州,510030 |
| 摘 要： | 针对岩土介质结构在破坏过程中局部化变形的问题,结合位移不连续的思想,提出内嵌局部软化带模型来捕捉结构中的局部化带.通过虚功原理建立了含局部化带影响的弹黏塑性的有限元计算模式,其中分叉理论作为局部化判断条件.模型将局部化带的形成视为一个黏塑性屈服流动过程,从而能够连续地描述局部化变形前后的力学性质.特点是计算量小、物理意义明确,可以方便地整合到传统有限元分析程序中.算例表明,计算模型是合理和有效的. |
| 关 键 词： | 应变局部化 弹黏塑性 内嵌软化带 岩土介质 有限元 应变局部化 弹黏塑性分析 软化 计算模型 bands softening embedded problems strain localization 算例 分析程序 整合 物理意义 计算量 力学性质 描述 位移不连续 流动过程 塑性屈服 条件 |
| 文章编号： | 1000-7598-(2008)03-0823-05 |
| 收稿时间： | 2006-06-08 |
| 修稿时间： | 2006年6月8日 |
Elasto-viscoplastic finite element analysis for strain localization problems with embedded localized softening bands |
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| LIU Jin-long,CHEN Sheng-hong,XIE Jia-bi,BAO Yi-zhou.Elasto-viscoplastic finite element analysis for strain localization problems with embedded localized softening bands[J].Rock and Soil Mechanics,2008,29(3):823-827. | |
| Authors: | LIU Jin-long CHEN Sheng-hong XIE Jia-bi BAO Yi-zhou |
| Institution: | 1. Guangzhou Construction Science & Technology Committee Office, Guangzhou 510030, China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 3. China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 4.Guangzhou City Center Transport Project Office of Leading Group, Guangzhou 510030, China |
| Abstract: | To simulate the strain localization in the failure process of geomaterials, a model with embedded localized softening bands incorporating into the idea of strong discontinuities is presented. Based on the virtual work principle, the equilibrium equations of FEM considering the effect of localization deformation are established; and the bifurcation theory is adopted as the criterion of onset of strain localization. The model can describe the mechanism of pre-localization and post-localization continuously by regarding localization as a viscoplastic flow procedure. The main advantages of this algorithm are that the model needs little amount of computation, and it has exact physical meaning compared with other methods. Furthermore, it can be incorporated into the conventional finite element analysis procedure. Numerical results have been carried out to show the validity of the model. |
| Keywords: | strain localization elasto-viscoplasticity embedded localized softening bands geomaterials FEM |
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