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预设裂缝沥青复合小梁扩展有限元模拟 被引量:4
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作者 朱海鹏 刘子楠 +1 位作者 李双蓓 严世涛 《广西大学学报(自然科学版)》 CAS 北大核心 2018年第3期1134-1142,共9页
对含预设裂缝沥青复合小梁进行疲劳试验,探讨梁底部的支撑方式和预设裂缝位置对于复合小梁裂缝扩展行为和疲劳寿命的影响。采用随机骨料生成和投放算法建立复合梁的异质模型,借助ABAQUS平台的扩展有限元方法对比分析了复合梁在均质和异... 对含预设裂缝沥青复合小梁进行疲劳试验,探讨梁底部的支撑方式和预设裂缝位置对于复合小梁裂缝扩展行为和疲劳寿命的影响。采用随机骨料生成和投放算法建立复合梁的异质模型,借助ABAQUS平台的扩展有限元方法对比分析了复合梁在均质和异质模型下的裂缝扩展路径,并将模拟结果与试验结果进行对比。研究结果表明:均质和异质模型下裂缝扩展行为总体上基本一致,但裂缝扩展路径、最大主应力分布形式相差较大,异质模型下裂缝扩展路径更接近试验结果,其最大主应力分布也能更好地解释裂缝扩展朝着荷载作用位置进行且扩展速率在裂缝扩展过程中逐渐增大的现象;平板支撑方式下沥青复合小梁裂缝扩展行为与实际路面状况更接近。 展开更多
关键词 沥青复合小梁 预设裂缝 疲劳试验 随机骨料生成和投放算法 扩展有限元 扩展路径
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A mesoscale model based on Monte-Carlo method for concrete fracture behavior study 被引量:5
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作者 ZHANG NaiLong GUO XiaoMing +1 位作者 ZHU BiBo GUO Li 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第12期3278-3284,共7页
An aggregate generation and packing algorithm based on Monte-Carlo method is developed to express the aggregate random distribution in cement concrete. A mesoscale model is proposed on the basis of the algorithm. In t... An aggregate generation and packing algorithm based on Monte-Carlo method is developed to express the aggregate random distribution in cement concrete. A mesoscale model is proposed on the basis of the algorithm. In this model, the concrete con- sists of three parts, namely coarse aggregate, cement matrix and the interracial transition zone (ITZ) between them. To verify the proposed model, a three-point bending beam test was performed and a series of two-dimensional mesoscale concrete mod- els were generated for crack behavior investigation. The results indicate that the numerical model proposed in this study is helpful in modeling crack behavior of concrete, and that treating concrete as heterogeneous material is very important in frac- ture modeling. 展开更多
关键词 cement concrete FRACTURE Monte-Carlo method aggregate generation and packing algorithm mesoscale models
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