基于累积残余应变和刚度的钢纤维高强混凝土梁疲劳损伤规律研究  

Study on fatigue cumulative damage of steel fiber reinforced high-strength concrete beams based on cumulative residual compressive strain and rigidity

作　　者：张明[1] 张庆伟[1] 景嘉骅[2] ZHANG Ming ZHANG Qingwei JING Jiahua(School of Civil Engineering and Architecture, Anyang Normal University, Anyang 455000, China Research Center for New Construction Material and Structure, Zhengzhou University,Zhengzhou 450001, China)

机构地区：[1]安阳师范学院建筑工程学院,河南安阳455000 [2]郑州大学新型建材与结构研究中心,河南郑州450001

出　　处：《四川建筑科学研究》2017年第5期33-37,共5页Sichuan Building Science

基　　金：国家青年自然科学基金(51308504);河南省高校重点科研项目(16A560027;17A560001)

摘　　要：本文共设计了6根钢筋钢纤维高强混凝土梁,通过等幅疲劳试验分析了钢纤维体积率和钢纤维类型等因素对钢筋钢纤维高强混凝土梁受压边缘混凝土累积残余应变及刚度的影响,并利用梁受压边缘累积残余应变和刚度分别定义了钢纤维高强混凝土梁的疲劳损伤,根据试验数据确定了梁的疲劳损伤曲线,并根据疲劳循环不同时期的累积残余应变判断其损伤状态。研究及试验结果表明:随着疲劳循环次数的增加,钢筋钢纤维高强混凝土梁受压边缘混凝土累积残余应变逐渐增大,而试件的抗弯刚度逐渐减小,其发展具有明显的阶段性;钢纤维有效降低了梁受压边缘混凝土累积残余应变发展速率和刚度的衰减速率,抑制了梁疲劳损伤的发展。Based on the fatigue tests of 6 steel fiber reinforced high-strength concrete beams, the influences of steel fiber volume ratio and steel fiber type on the cumulative residual compressive strain at the compressive region and rigidity of reinforced high-strength concrete beams were studied in the paper. Through the cumulative residual compressive strain and rigidity, the fatigue cumulative damage of steel fiber reinforced high-strength concrete beams was calculated and defined. Then the curve of cumulative damage and damage state was determined in accordance with test results. The results show that the cumulative residual compressive strain of the steel fiber reinforced high-strength concrete beams increases with the increasing of fatigue cycles, and the rigidity decreases at same time. The development trend curve of cumulative residual compressive strain and rigidity degradation have significant stage behavior. The increasing rate of cumulative residual compressive strain and attenuating rate of rigidity decreases with the addition of steel fiber. Steel fiber can effectively control the degree of damage.

关 键 词：钢纤维 高强混凝土梁 疲劳试验 累积残余应变 刚度 疲劳损伤 

分 类 号：TU375.1[建筑科学—结构工程]