超声波作用下二维随机骨料混凝土模型损伤研究  

Study on Plastic Damage of Two-dimensional Concrete with Random Distribution Aggregate Using Ultrasonic Wave Numerical Simulation

作　　者：陈启东[1] 沈益晨 王力晓 刘鑫 Chen Qidong;Shen Yichen;Wang Lixiao;Liu Xin(School of Mechanical Engineering Changshu Institution of Technology,Suzhou 215500 China;School of Mechanics Soochow University,Suzhou 215000 China)

机构地区：[1]常熟理工学院机械工程学院,苏州215500 [2]苏州大学机电工程学院,215000

出　　处：《特种结构》2020年第6期9-14,共6页Special Structures

摘　　要：在现阶段城市道路和基础设施建设领域中,混凝土的高效破碎一直是研究的热点。本文运用超声波在混凝土破碎中的作用机理,以水泥混凝土为对象,完成超声波破碎混凝土的有限元建模和数值仿真,研究超声波作用下混凝土的损伤。利用富勒级配曲线和瓦拉文平面转换公式,在APDL程序编程建立混凝土的二维圆形骨料随机分布模型,导入ABAQUS中,并赋予各相材料塑性损伤本构关系来研究混凝土的破坏规律。结果表明:随着应力波幅值以及加载区域的增大,混凝土更容易积累损伤达到破坏;粗骨料粒径与体积分数分别为5mm^10mm和40%可使混凝土抗损伤能力达到最大。In the field of urban roads and infrastructure construction,how to efficiently crush concrete has always been a research hot topic.In this paper,the finite element modeling and numerical simulation of ultrasonic fractured concrete were carried out to study the damage of concrete under ultrasonic action.Using the Fuller grading curve and the Walraven formula,the two-dimensional concrete with random distribution circular aggregate was programmed in APDL and imported into ABAQUS.Then,the plastic constitutive relations of the materials at each phase were given to study the concrete failure law.The results show that with the increase of the stress wave amplitude and the loading area,concrete is more likely to accumulate damage and reach destruction.The concrete anti-damage ability is maximum when the coarse aggregate grain size is 5 mm ~10 mm and volume fraction is 40%.

关 键 词：混凝土 超声波 数值仿真 随机分布 塑性损伤 

分 类 号：TU528[建筑科学—建筑技术科学]