摘要
为研究高温后型钢再生混凝土柱的损伤劣化机理及刚度退化规律,以经历高温温度、恒温时间、取代率、型钢保护层厚度、配钢率、配箍率和偏心率为变化参数,设计54个型钢再生混凝土柱试件(其中轴压试件48个,偏压试件6个),对其进行高温后静力加载试验,得到其荷载-位移曲线。从试件表面劣化程度、损伤场变量、轴压刚度及抗弯刚度等方面分析了其损伤程度及剩余刚度,并研究其抗弯刚度的计算方法。研究结果表明:经历温度越高,试件表面的劣化程度越显著;随着高温温度的升高、恒温时间的增加,高温后试件的损伤程度逐渐提高,轴压刚度和抗弯刚度逐渐降低;保护层厚度越小,高温后轴压试件的轴压刚度越低,偏心率越大、取代率越小,高温后偏压试件的抗弯刚度越低;配钢率和配箍率对其损伤值及剩余刚度的影响不大;抗弯刚度计算值与试验值吻合较好。
In order to investigate the damage mechanism and rigidity deterioration law of steel reinforced recycled aggregate concrete columns after exposure to high temperature,54 specimens,including 48 for axial loading tests and six for eccentric tests,were designed with different high temperature,constant temperature time,displacement ratio,cover thickness,steel ratio,stirrup spacing and eccentricity ratio and tested by static loading. The load-deformation curves and load-deflection curves were obtained. The damage degree and residual rigidity were analyzed by taking into account the surface degradation of the specimen,damage field variable,axial rigidity and flexural rigidity. The calculation method for the flexural rigidity is discussed. Results show that the higher the temperature is,the more significant deterioration of the surface of the specimen is; with the increase of temperature and duration time,the damage degree increases gradually and the axial rigidity and flexural rigidity reduce gradually; the smaller thickness of concrete cover is,the lower axial rigidity of specimens becomes; the bigger eccentricity ratio and smaller replacement ratio are,the lower flexural rigidity of specimens is; the steel ratio and stirrup ratio have no significant influence on damage value and residual rigidity; calculation values of flexural rigidity are in good agreement with the experimental values by the formulas.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第5期129-137,共9页
Journal of Building Structures
基金
国家自然科学基金项目(51268004
51578163)
关键词
型钢再生混凝土柱
高温作用
静力试验
损伤
刚度
steel reinforced recycled concrete column
high temperature effect
static test
damage
rigidity
