橡胶混凝土单轴受压疲劳性能研究  

THE UNIAXIAL COMPRESSION FATIGUE PERFORMANCE OF RUBBER CONCRETE

作　　者：薛刚[1] 朱浩君 许胜[1] 刘利强 XUE Gang;ZHU Hao-jun;XU Sheng;LIU Li-qiang(School of Civil Engineering,University of Inner Mongolia Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,包头014010

出　　处：《工程力学》2022年第11期203-211,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51868063)。

摘　　要：为掌握橡胶混凝土单轴受压疲劳性能,用粒径为30目的橡胶颗粒以不同掺量代砂制备橡胶混凝土,进行等幅循环荷载单轴受压疲劳试验研究。采用Miner累积损伤理论定义损伤量,并建立橡胶混凝土疲劳应变的损伤模型。使用概率统计方法对橡胶混凝土疲劳寿命的试验结果进行可靠性分析,得到等幅循环荷载作用下橡胶混凝土单轴受压疲劳寿命分布规律。结果表明:应力水平相同时,橡胶混凝土的疲劳寿命优于普通水泥混凝土,且随橡胶掺量的增加,混凝土的疲劳寿命随之提高。橡胶混凝土的疲劳应变变化符合普通混凝土疲劳应变发展的三阶段规律,橡胶混凝土疲劳寿命服从对数正态分布。采用双对数方程对橡胶混凝土的疲劳寿命进行线性回归分析,可得到P-S-N曲线及疲劳极限强度。To study the uniaxial stress fatigue performance of rubber concrete,equal cyclic load uniaxial stress fatigue tests were carried out.Rubber particles with a particle size of 30 meshes were used to replace sand by different dosages to prepare the rubber concrete.The Miner’s cumulative damage theory was used to define the damage quantity and establish the damage model of the rubber concrete fatigue strain.Probability and statistical methods are used to analyze the reliability of the test results of the fatigue life of rubber concrete.The distribution of the fatigue life of rubber concrete under uniaxial compressive constant amplitude cyclic loading is obtained.The results show that,with the same stress level,the fatigue life of rubber concrete is better than ordinary cement concrete and increases with the increase of rubber mixing quantity.The fatigue strain change of rubber concrete meets the three-stage law of ordinary concrete fatigue strain development.Its fatigue life follows the lognormal distribution.The linear regression analysis of the fatigue life of rubber concrete yields the P-S-N curve and fatigue limit strength.

关 键 词：橡胶混凝土 单轴受压 疲劳 累积损伤 可靠性 

分 类 号：TU528.41[建筑科学—建筑技术科学]