骨料级配对水工全级配和湿筛混凝土拉伸断裂性能差异的影响  

Effect of Aggregate Gradation on Differences of Tensile Fracturing Behaviors of Hydraulic Fully-graded and Wet-screened Concretes

作　　者：荆帅召 杨鑫[1] 周昌巧 刘杰 徐磊[1] Jin Shuaizhao;Yang Kin;Zhou Changqiao;Liu Jie;Xu Lei(College of Water Conservancy &Hydropower Engineering,Hohai Univ.,Nanjing 210098,China;Chongqing Surveying &Design Institute of Water Resources,Electric Power &Architecture,Chongqing400020,China)

机构地区：[1]河海大学水利水电学院,南京210098 [2]重庆市水利电力建筑勘测设计研究院,重庆400020

出　　处：《三峡大学学报（自然科学版）》2018年第6期11-15,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(51739006;U1765204);中央高校基本科研业务费项目(2018B11414)

摘　　要：采用湿筛混凝土表征全级配混凝土力学性能是解决试验条件受限时水工混凝土性能测试的重要方法.目前关于骨料级配对水工全级配和湿筛混凝土拉伸断裂性能差异的影响少见研究,因此论文采用细观有限元分析与Monte Carlo模拟相结合的方法,在分析不同骨料级配水工全级配和湿筛混凝土拉伸断裂性能差异的基础上,重点探究上述差异随骨料级配的变化规律.研究表明,骨料级配对全级配与湿筛混凝土拉伸断裂性能的差异有着较为明显的影响,主要表现在随着骨料粒径的增大和大骨料占比的提高,拉伸弹性模量的比值(大于1)增大,峰值抗拉强度、峰值拉伸应变及断裂能的比值(小于1)减小.It is significant that the mechanical properties of hydraulic fully-graded concretes can be represented by the wet-screened concretes with the restriction of test condition.However,it has rare investigation in the effect of aggregate gradation on tensile fracture performance differences between hydraulic fully-graded and wet-screened concretes;this paper uses a combination of mesoscopic finite element analysis and Monte Carlo simulation to show the tensile fracture performance differences between hydraulic fully-graded and wetscreened concretes with different aggregate gradations;and the regularities of above-mentioned differences are emphasized with the variation of aggregate gradation.It is shown that the aggregate gradation has a significant impact on the tensile fracture performance of fully-graded and wet-screened concretes,which is mainly manifested in the ratio of tensile elastic modulus(greater than 1)increases;and the ratio of peak tensile strength,peak tensile strain together with fracture energy(less than 1)decreases with the increase of aggregate size and proportion of large aggregates.

关 键 词：水工全级配混凝土 湿筛混凝土 拉伸断裂 细观分析 

分 类 号：TV431[水利工程—水工结构工程]