CFRC梁在三点弯曲荷载作用下电阻与CMOD关系  

Resistance-CMOD Relationship of CFRC Beams Under Three-Point Flexure Loading

作　　者：姚武[1] 钟文慧[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092

出　　处：《同济大学学报（自然科学版）》2008年第2期227-230,共4页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金重点资助项目(50238040)

摘　　要：研究了不同碳纤维掺量的CFRC(碳纤维水泥基材料)梁在三点弯曲荷载作用下其电阻变化与CMOD(裂缝口张开位移)的关系.试验研究发现,峰值荷载前CFRC梁的电阻—CMOD曲线均出现明显的转折点.当碳纤维掺量为胶凝材料质量的0.1%时,电阻—CMOD曲线表现出三个不同的变化阶段,其中第一个转折点接近峰值荷载点.而碳纤维掺量达到胶凝材料质量的0.2%和0.3%时,电阻—CMOD曲线则呈现两个变化阶段,并且转折点随着碳纤维掺量的增加逐渐远离峰值荷载点.电阻—CMOD曲线的第二阶段为线性变化过程,其中碳纤维掺量为0.2%时,CFRC材料的灵敏系数最高.This paper presents a study of the resistance-CMOD （crack mouth opening displacement） relationship of CFRC （carbon fiber reinforced cement based material） beam with different carbon fiber fractions under three-point flexure loading. The experiments show that there exists an apparent turning point before the peak load in resistance-CMOD curve of CFRC beam. When the carbon fiber frac- tion is 0.1% by mass of cement, the resistance-CMOD curves display three different phases, and the first turning point approaches to the peak point of loading. For the CFRC beams with carbon fiber fraction of 0.2 % and 0.3 % by mass of cement, the resistance-CMOD curves display only two different phases, the turning points between the first and the second phases are apart from the peak points of loading. The second phase of resistance-CMOD curve is linear. During the second phase, the sensitive coeffident for CFRC beam containing carbon fiber fraction of 0.2% by mass of cement is among the highest of the three mixtures.

关 键 词：碳纤维水泥基材料 三点弯曲 电阻 裂缝口张开位移 

分 类 号：TU528.1[建筑科学—建筑技术科学]