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      再生混凝土材料单轴抗压强度的数值模拟
发表时间:2011-07-31  浏览量:1768  下载量:862
          
        | 全部作者: | 程娟,彭一江,党娜娜 | 
| 作者单位: | 北京工业大学建筑工程学院 | 
| 摘 要: | 为研究再生混凝土的材料强度及破坏机理,在细观层次上将再生混凝土视为由天然粗骨料、旧水泥砂浆、新水泥砂浆、老粘结带、新粘结带组成的非均匀五相复合材料。根据瓦拉文公式确定代表骨料的颗粒数,采用蒙特卡罗方法生成随机骨料模型,通过双折线损伤模型描述再生混凝土细观单元的损伤退化,利用非线性有限元方法对再生混凝土轴向压缩下的细观损伤进行数值模拟,得到再生混凝土应力应变曲线和抗压强度。 | 
| 关 键 词: | 结构工程;再生混凝土;细观层次;随机骨料模型;单轴压缩;强度 | 
| Title: | Numerical simulation of uniaxial compression strength for recycled concrete | 
| Author: | CHENG Juan, PENG Yijiang, DANG Nana | 
| Organization: | College of Architecture and Civil Engineering, Beijing University of Technology | 
| Abstract: | In order to study strength and failure mechanism of recycled concrete, the recycled concrete is taken as a non-uniform five-phase composites consisting of natural aggregate, old cement mortar, new cement mortar, old bond zone and new bond zone on meso-level. According to Walraven formula, the number of representative aggregate particles is determined. The meso-scale structure is represented with random aggregate model by using Monte-Carlo method. Double broken line damage model is adopted to describe the meso-element's damage devolution. The propagation processes of cracks of recycled concrete in uniaxial compression test are simulated using finite element method. The stress-strain curve and compressive strength of recycled concrete are gained. | 
| Key words: | structural engineering; recycled concrete; meso-level; random aggregate model; uniaxial compression; strength | 
| 发表期数: | 2011年7月第14期 | 
| 引用格式: | 程娟,彭一江,党娜娜. 再生混凝土材料单轴抗压强度的数值模拟[J]. 中国科技论文在线精品论文,2011,4(14):1269-1274. | 
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