摘要
为研究地震荷载作用下钢筋混凝土(RC)构件动态破坏的尺寸效应,对6根不同尺寸的钢筋混凝土短柱进行了不同加载速率下的轴心受压试验(应变率在1×10^-5~1×10^-2 s^-1范围内),根据试验结果从荷载-位移曲线、延性和钢筋与混凝土应变等方面分析了应变率和尺寸效应共同影响下RC柱的轴压破坏特性。基于试验数据,提出了钢筋混凝土短柱轴心受压承载力计算修正参数。研究结果表明:在所研究的应变率范围内,RC短柱轴压破坏特征受加载速率变化的影响不显著,但随尺寸变化存在一定差异性;RC短柱动态破坏极限承载力依然存在尺寸效应,整体表现出承载力随尺寸增大而降低的趋势,但其降低效应显著小于应变率的提高效应,峰值承载力处的位移随加载速率的提高而降低;RC短柱延性随尺寸增大而增大,随应变率提高而降低,且尺寸的影响大于应变率;提出的钢筋混凝土短柱轴心受压承载力计算修正参数对于同类问题的定量计算和分析具有参考价值。
In order to study the size effect of dynamic failure of reinforced concrete(RC) member under seismic load, six reinforced concrete short columns with different sizes were subjected to axial compression tests at different loading rates(the strain rate was in the range of 1×10^-5 to 1×10^-2 s^-1). According to test results, the failure characteristics of RC axial compression columns under the influence of strain rate and size effect were analyzed from load-displacement curve, ductility, reinforcement and concrete strain and other aspects. Based on the measured data, a correction factor for calculating the bearing capacity of RC axial compression short columns was proposed. The study results show that the change of the loading velocity has no obvious effect on the failure characteristics of RC axial compression short columns in the studied range of strain rate, but there is a certain difference when size changes. The ultimate bearing capacity also has size effect, as a whole, it decreases when size increases, but its reduction effect is much smaller than that of strain rate. The displacement at peak load decreases with the increase of loading rate. The ductility increases when size increases but decreases when strain rate increases, and the influence of the size is greater than the strain rate. The proposed correction factor for calculating the bearing capacity of RC axial compression short columns will provide reference for quantitative calculation and analysis of similar problems.
作者
周宏宇
袁慧
邢晓帅
赵晓花
张雅然
ZHOU Hong-yu;YUAN Hui;XING Xiao-shuai;ZHAO Xiao-hua;ZHANG Ya-ran(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;China Building Technique Group Co.,Ltd,Beijing 100013,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2019年第5期62-70,共9页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51378030,51978012)
北京市自然科学基金京津冀合作专项项目(J160002)
北京市自然科学基金项目(8152004)
关键词
钢筋混凝土短柱
轴心受压
尺寸效应
应变率效应
承载力
修正参数
reinforced concrete short column
axial compression
size effect
strain rate effect
bearing capacity
correction factor
