高温后型钢再生混凝土短柱轴压性能试验

TEST OF STEEL REINFORCED RECYCLED AGGREGATE CONCRETE AXIAL COMPRESSION SHORT COLUMNS AFTER HIGH TEMPERATURE

为研究高温后型钢再生混凝土(SRRAC)柱的轴压性能,以高温温度、恒温时间、型钢保护层厚度、配钢率和配箍率为变化参数,对18个试件进行高温后的静力单调加载试验,观察不同温度后试件的受力破坏过程和形态,获取了质量烧失率、荷载-位移全过程曲线和剩余承载力等数据,并对各参数对其力学性能的影响予以分析。结果表明:高温后型钢再生混凝土柱轴心受压破坏过程和形态与常温下基本相同,均呈灯笼状破坏。高温后型钢再生混凝土柱的轴压刚度和剩余承载力退化明显,且温度越高,退化程度越大。高温后SRRAC柱承载能力降低了13%~50%,其中600℃时下降32%~42%。

In order to reveal the axial compression behavior of steel reinforced recycled aggregate concrete( SRRAC)columns after high temperature,18 specimens were designed for monotonic loading experiment after high temperature,and five varying parameters were considered,which were the high temperature,the constant temperature time,the cover thickness,the steel ratio and the stirrup ratio. The failure processes and forms of specimens at different temperatures were observed,the percentage of mass decrement,load-displacement curves,residual bearing capacity,and other important data were obtained. And the effecting law of each changing parameters on the SRRAC columns' mechanical behavior after high temperature was analyzed. Results showed that the failure mode of SRRAC columns after high temperature was similar to that at normal temperature. The SRRAC columns after high temperature had certain deformation performance after ultimate load,but the axial rigidity and residual bearing capacity of specimens were reduced compared with that at normal temperature. The strength of the specimens after high temperature was reduced by 13% to 50%,which was reduced by 32% to 42% at 600 ℃.