考虑初始随机缺陷的橡胶混凝土破坏形态研究  

Study of rupture form for rubber concrete considering initial random defect

作　　者：郭琦[1,2] 吴梦 孙虎平 罗麒锐[1] GUO Qi;WU Meng;SUN Huping;LUO Qirui(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Shaanxi Key Lab of Structure and Earthquake Resistance(XAUAT),Xi′an 710055,China;Xi′an Municipal Design and Research Institute Co.,Ltd,Xi′an 710000,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]陕西省结构与抗震重点实验室,陕西西安710055 [3]西安市政设计研究院有限公司,陕西西安710000

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第6期806-812,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划基金资助项目(2020JM-477);青海省科技厅基础应用研究计划基金资助项目(2018-ZJ-742)。

摘　　要：以橡胶颗粒作为集料制备而成的橡胶混凝土生态材料,在改善延性性能的同时也改变了传统混凝土的缺陷形态.本文基于黏结裂缝模型,以橡胶混凝土的砂浆、粗骨料、橡胶颗粒、砂浆-橡胶界面、砂浆-骨料界面及砂浆-砂浆界面组成的六相材料细观构型为切入点,提出建立橡胶混凝土二维随机初始缺陷模型的方法,描述了典型破坏形态,并探讨了橡胶粒、不同位置初始缺陷含量对计算结果的影响程度.结果表明:随着粒径的减小,橡胶混凝土的抗拉强度增加;初始缺陷对橡胶混凝土的力学性能影响程度显著且随含量的增加呈线性降低,在数值模拟中,不可忽略.Rubber concrete,being an ecological material,was prepared by using rubber particles as aggregates,which improved the ductile property.At the same time,it changed the defect morphology of traditional concrete.Based on the bonded crack model,the meso-configuration of the six-phase material composed of rubber concrete mortar,coarse aggregate,rubber granule,mortar-rubber interface,mortar-aggregate interface and mortar-mortar interface are built up.The method of two-dimensional random initial defect model of rubber concrete account for describing the typical failure modes.Then it evaluates the influence of rubber particles,initial defect content and degree under different loading rates on the calculation values.Results show that the tensile strength of rubber concrete increases with the decrease of rubber particle size.The initial defects have a significant effect on the mechanical properties of rubber concrete and decrease linearly with the increase of content.In numerical simulation,these may not be ignored.

关 键 词：橡胶混凝土 初始缺陷 黏结裂缝模型 细观模型 数值模拟 小粒径 

分 类 号：TU318[建筑科学—结构工程]