橡胶集料混凝土细观损伤特性的加载速率效应  

Loading rate effect of meso-damage characteristics of crumb rubber concrete

作　　者：狄胜同 贾超[2] 乔卫国[3,4] 李康 童凯 DI Sheng-tong;JIA Chao;QIAO Wei-guo;LI Kang;TONG Kai(School of Civil Engineering,Shandong University,Jinan 250061,China;Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China;Key Laboratory of Disaster Prevention and Reduction of Civil Engineering,Qingdao 266590,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东大学土建与水利学院,济南250061 [2]山东大学海洋研究院,山东青岛266237 [3]山东省土木工程防灾减灾重点实验室,山东青岛266590 [4]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《吉林大学学报（工学版）》2019年第6期1900-1910,共11页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目（51474135,41272325）

摘　　要：基于颗粒离散元理论,选取对应不同级别应变率的0.001、0.01、0.1、1.0、3.0 m/s五种加载速率,模拟实现普通混凝土(NC)和橡胶集料混凝土(CRC)单轴抗压强度试验,系统分析了加载速率对本构关系、裂纹扩展、细观损伤及能量演化的影响规律。结果表明:材料的单轴抗压强度以及相应峰值应变随加载速率增的加呈现非线性增长关系,CRC较NC表现出更为明显的加载速率敏感性;加载速率与NC裂纹生成速率呈现负相关关系。而与CRC裂纹生成速率呈正相关关系。提出了两种材料细观损伤变量与加载速率间的拟合方程,拟合效果较好,同时分析了不同加载速率对材料弹性应变能和动能的演化规律影响。Based on the particle discrete element theory,five loading rates corresponding to different levels of strain rate were selected in this paper,and the corresponding loading rates were 0.001 m/s,0.01 m/s,0.1 m/s,1.0 m/s and 3.0 m/s.The uniaxial compressive strength test of normal concrete(NC)and crumb rubber concrete(CRC)was simulated,and the effect of loading rate on the constitutive relation,crack propagation,meso-damage and energy evolution was systematically analyzed.The results show that the uniaxial compressive strength and the corresponding peak strain of the material present a nonlinear growth relationship with the increase of the loading rate.The loading rate sensitivity of CRC is more obvious than that of NC.There is a negative correlation between loading rate and NC crack generation rate,but a positive correlation between loading rate and CRC crack generation rate.The fitting equations between the mesoscopic damage variables and the loading rates of the two materials are proposed,and the fitting result is good,and the effects of different loading rates on the evolution law of elastic strain energy and kinetic energy of materials are analyzed.

关 键 词：道路工程 橡胶集料混凝土 细观损伤 颗粒离散元 加载速率 裂纹扩展 

分 类 号：TU528[建筑科学—建筑技术科学]