摘要
为深入研究细观粗骨料粒径对混凝土宏观构件非线性力学性能的影响,通过生成满足Fuller级配的骨料粒径,以放置区域像素的RGB(红绿蓝)值判断骨料重叠情况,实现骨料在混凝土内部的随机分布。在此基础上,运用均匀化方法求解二维细观随机多边形骨料模型的等效弹性模量及刚度矩阵,并引入混凝土材料损伤因子模拟剪弯梁裂缝展开,由此构建混凝土多尺度非线性力学模型。结果表明,当混凝土进入塑性阶段后,骨料最大粒径对拉、压状态下损伤因子的相关性不可忽略,并直接影响宏观剪弯梁的裂缝开展及最大塑性应变大小,且有可能改变剪弯梁的破坏模式。
In order to further study the influence of the mesoscopic coarse aggregate gradation on the nonlinear mechanical properties of concrete macroscopic components,the aggregate size satisfying Fuller grading was generated,and the aggregate overlap was judged by the RGB(red,green,bule)value of the placement area pixels,so as to realize the random distribution of aggregate in concrete.On this basis,the equivalent elastic modulus and stiffness matrix of two-dimensional mesoscopic random polygonal aggregate model were solved by homogenization method,and the damage factor of concrete material was introduced to simulate the crack expansion of shear-flexural beam,so a multi-scale nonlinear mechanical model of concrete was established.The results show that when the concrete enters the plastic stage,the correlation between the maximum aggregate size and the damage factor under tension and compression can not be ignored,which directly affects the crack development and the maximum plastic strain of the macroscopic shear-flexural beam.It may also change the failure mode of shear-flexural beam.
作者
胡彪
王宪杰
王思文
李承玥
王兆毅
翁振江
HU Biao;WANG Xianjie;WANG Siwen;LI Chengyue;WANG Zhaoyi;WENG Zhenjiang(School of Architecture and Urban Planning,Yunnan University,Kunming 650500,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Zhejiang Southeast Space Frame Group Company Limited,Hangzhou 311209,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第3期836-844,共9页
Bulletin of the Chinese Ceramic Society
基金
国家留学基金委(201907035008)
云南省教育厅科学研究基金(2020Y0020)
云南省科技厅科技计划(202001BB050059)。
关键词
混凝土粗骨料
多尺度非线性
Fuller级配
等效弹性模量
剪弯梁
concrete coarse aggregate
multi-scale nonlinearity
Fuller grading
equivalent elastic modulus
shear-flexural beam
