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基于声发射循环加卸载时侧压混凝土损伤特性研究
引用本文:马小亮,彭刚,吴彬,胡伟华.基于声发射循环加卸载时侧压混凝土损伤特性研究[J].长江科学院院报,2017,34(1):135-141.
作者姓名:马小亮  彭刚  吴彬  胡伟华
作者单位:1.三峡大学 土木与建筑学院, 湖北 宜昌 443002; 2.湖北工业职业技术学院 建筑工程系,湖北 十堰 443000; 3. 十堰市建筑设计研究院,湖北 十堰 443000
基金项目:国家自然科学基金,三峡大学培优基金
摘    要:在水平单向侧压应力作用下,进行了竖向等应变步长循环加卸载的混凝土抗压性能试验。对不同侧应力状态下的外包络线、共同点轨迹线和循环加卸载全曲线进行了分析,研究了侧应力对累积残余塑性应变和刚度退化的影响,探索了混凝土在加载全过程中的能量释放特性,基于声发射事件数构建的损伤变量分析了混凝土的损伤规律。研究结果表明:①在整个循环加卸载试验过程中,声发射事件数主要集中在峰值应力以前,峰值应力以后出现较少,峰值应力后的声发射能量随侧向压应力的增大而增大;②混凝土刚度退化速度及累积残余塑性应变随侧压应力的增加而减小;③不同侧向压应力下混凝土损伤发展路径各异,侧压应力越高,损伤路径越短,水平与竖向荷载间的大小比例,决定了混凝土损伤的主导因素与损伤机制。

关 键 词:混凝土    循环荷载    声发射    损伤特性    刚度退化  
收稿时间:2015-11-19

Damage Characteristics of Concrete under Lateral Stress and Vertical Cyclic Loading and Unloading Based on Acoustic Emission
MA Xiao-liang,PENG Gang,WU Bin,HU Wei-hua.Damage Characteristics of Concrete under Lateral Stress and Vertical Cyclic Loading and Unloading Based on Acoustic Emission[J].Journal of Yangtze River Scientific Research Institute,2017,34(1):135-141.
Authors:MA Xiao-liang  PENG Gang  WU Bin  HU Wei-hua
Affiliation:1.College of Civil Engineering & Architecture, Three Gorges University, Yichang 443002, China; 2.Architectural Engineering Department, Hubei Industrial Polytechnic, Shiyan 443000, China; 3.Shiyan Architectural Design Institute, Shiyan 443000, China
Abstract:The compressive performance of concrete was tested under uniaxial lateral stress and vertically equal strain cyclic loading and unloading. The envelopes, cyclic loading and unloading curves, and common-point ( point of the intersection between unloading curve and reloading curve ) tracks under different lateral stresses were ana-lyzed. Moreover, the influence of lateral stress on stiffness degradation and cumulative residual plastic strain was studied. The energy release characteristics in the whole loading process were explored, and the damage characteris-tics of concrete were analyzed based on the damage variable determined by the number of AE event. Results re-vealed that 1) throughout the course of cyclic loading and unloading tests, the number of AE event was concentrat-ed before the peak stress, and became less after the peak stress, and the AE energy also increased with the increase of lateral stress after peak stress;2) with the increase of lateral compressive stress, concrete’ s stiffness degradation rate and accumulated residual plastic strain decreased;3) the damage development path was different under differ-ent lateral stresses. The higher the lateral stress, the shorter the damage path. The size ratio between horizontal and vertical loads determines the dominant factors and damage mechanism of concrete.
Keywords:concrete  cyclic loading  acoustic emission  damage characteristics  stiffness degradation
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