再生块体混凝土构件的块体堆积密度与边界效应分析
发布时间：2019-01-20 12:10
【摘要】：采用基于离散元法的PFC3D商用软件,研究了废旧混凝土块体特征尺寸、配筋形式、钢筋直径和保护层厚度对再生块体混凝土构件中块体堆积密度的影响,并对部分结果进行了试验验证,建立了无配筋时块体堆积密度与块体特征尺寸等因素的定量关系,探讨了块体特征尺寸对再生块体混凝土边界效应的影响。研究表明:配置钢筋会显著降低块体堆积密度,但在工程常用范围内,箍筋保护层厚度、纵筋直径和箍筋直径增加所导致的块体堆积密度的降低幅度有限;边界效应层的厚度与块体特征尺寸之比为1.8~2.0;当块体体积分数一定时,对应不同的块体特征尺寸,块体面积分数的最大值改变有限,该最大值与块体体积分数之比约为1.33。
[Abstract]:PFC3D commercial software based on discrete element method is used to study the effects of characteristic size, reinforcement form, reinforcement diameter and cover thickness on the bulk density of recycled concrete blocks. The quantitative relationship between bulk packing density and block characteristic size is established, and the influence of block characteristic size on the boundary effect of recycled block concrete is discussed. The results show that the packing density of blocks can be significantly reduced by the reinforcement arrangement, but the decrease of bulk packing density is limited due to the increase of the thickness of the protection layer of stirrups, the diameter of longitudinal bars and the diameter of stirrups. The ratio of the thickness of the boundary effect layer to the characteristic size of the block is 1.8? When the volume fraction of the block is constant, the maximum value of the area fraction of the block is limited, and the ratio of the maximum value to the volume fraction of the block is about 1.33.
【作者单位】： 华南理工大学亚热带建筑科学国家重点实验室;中国建筑科学研究院;
【基金】：国家自然科学基金重点项目(51438007) 广州市科学(技术)研究专项重点项目(201607020005) 亚热带建筑科学国家重点实验室课题(2015ZB21,2013ZB24)
【分类号】：TU528
本文编号：2412028
[Abstract]:PFC3D commercial software based on discrete element method is used to study the effects of characteristic size, reinforcement form, reinforcement diameter and cover thickness on the bulk density of recycled concrete blocks. The quantitative relationship between bulk packing density and block characteristic size is established, and the influence of block characteristic size on the boundary effect of recycled block concrete is discussed. The results show that the packing density of blocks can be significantly reduced by the reinforcement arrangement, but the decrease of bulk packing density is limited due to the increase of the thickness of the protection layer of stirrups, the diameter of longitudinal bars and the diameter of stirrups. The ratio of the thickness of the boundary effect layer to the characteristic size of the block is 1.8? When the volume fraction of the block is constant, the maximum value of the area fraction of the block is limited, and the ratio of the maximum value to the volume fraction of the block is about 1.33.
【作者单位】： 华南理工大学亚热带建筑科学国家重点实验室;中国建筑科学研究院;
【基金】：国家自然科学基金重点项目(51438007) 广州市科学(技术)研究专项重点项目(201607020005) 亚热带建筑科学国家重点实验室课题(2015ZB21,2013ZB24)
【分类号】：TU528
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