基于二维随机骨料模型的再生混凝土力学性能分析  

Analysis of mechanical properties of recycled concrete based on two-dimensional random aggregate model

作　　者：王彦鹏 王子健 郭飞 苏睿 乔宏霞[3] WANG Yanpeng;WANG Zijian;GUO Fei;SU Rui;QIAO Hongxia(Gansu Construction Investment Green Building Materials Industry Development Group Co.,Ltd.,Lanzhou 730000,China;Gansu Construction Investment Commercial Concrete Co.,Ltd.,Lanzhou 730060,China;Engineering Research Center of Western Civil Engineering Disaster Prevention and Mitigation,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]甘肃建投绿色建材产业发展集团有限公司,甘肃兰州730000 [2]甘肃建投商品混凝土有限公司,甘肃兰州730060 [3]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《混凝土》2023年第1期87-91,共5页Concrete

基　　金：国家自然科学基金(51868044)。

摘　　要：为了对再生骨料取代率20%的混凝土进行力学性能评估,设计应力应变试验,通过蒙特卡罗方法、瓦拉文式随机生成骨料并计算骨料颗粒数目,建立由骨料、新旧砂浆和新旧界面过渡区组成的再生混凝土二维随机骨料模型,采用有限元网络对随机骨料模型进行划分,并给出再生混凝土单轴受压情况下的应力应变关系及变形趋势。结果表明:所建立的3种模型与试验结果吻合较好;随机骨料模型、过镇海模型与试验的峰值应力近似一致;多边形骨料模型更符合实际情况。In order to evaluate the mechanical properties of recycled aggregate concrete with 20% replacement rate.The stress-strain test was designed.The aggregate was randomly generated by Monte Carlo method and Walaven formula,and the number of aggregate particles was calculated.A two-dimensional random aggregate model of recycled concrete is established,which is composed of aggregate,new and old mortar and transition zone between new and old interface.The finite element network is used to divide the random aggregate model,and the stress-strain relationship and deformation of recycled concrete under uniaxial compression are given.The results show that the three models are in good agreement with the experimental results.The peak stress of random aggregate model and Guo Zhenhai model are approximately consistent with the test results.The polygonal aggregate model is more suitable for the actual situation.

关 键 词：再生混凝土 随机骨料模型 蒙特卡罗方法 应力应变 

分 类 号：TU528.041[建筑科学—建筑技术科学]