硅酸盐学报
硅痠鹽學報
규산염학보
JOURNAL OF THE CHINESE CERAMIC SOCIETY
2007年
12期
1630-1635
,共6页
钢纤维%高强混凝土%临界裂缝张开位移%有效裂缝长度%断裂韧度
鋼纖維%高彊混凝土%臨界裂縫張開位移%有效裂縫長度%斷裂韌度
강섬유%고강혼응토%림계렬봉장개위이%유효렬봉장도%단렬인도
steel fiber%high-strength concrete%critical crack opening displacement%effective crack length%fracture toughness
通过50个尺寸为100 mm×100 mm×515 mm的钢纤维高强混凝土切口梁三点弯曲试验,研究钢纤维体积率对高强混凝土有效裂缝长度、断裂韧度和临界裂缝张开位移的影响.结果表明:随着钢纤维体积率的增加,钢纤维高强混凝土断裂韧度增益比基本呈线性增加,临界裂缝尖端和临界裂缝嘴张开位移分别呈指数型增加.有效裂缝长度趋于稳定值,基本不受钢纤维体积率变化的影响.在分析试验结果的基础上,建立了钢纤维高强混凝土有效裂缝长度、断裂韧度和临界裂缝张开位移的计算公式.
通過50箇呎吋為100 mm×100 mm×515 mm的鋼纖維高彊混凝土切口樑三點彎麯試驗,研究鋼纖維體積率對高彊混凝土有效裂縫長度、斷裂韌度和臨界裂縫張開位移的影響.結果錶明:隨著鋼纖維體積率的增加,鋼纖維高彊混凝土斷裂韌度增益比基本呈線性增加,臨界裂縫尖耑和臨界裂縫嘴張開位移分彆呈指數型增加.有效裂縫長度趨于穩定值,基本不受鋼纖維體積率變化的影響.在分析試驗結果的基礎上,建立瞭鋼纖維高彊混凝土有效裂縫長度、斷裂韌度和臨界裂縫張開位移的計算公式.
통과50개척촌위100 mm×100 mm×515 mm적강섬유고강혼응토절구량삼점만곡시험,연구강섬유체적솔대고강혼응토유효렬봉장도、단렬인도화림계렬봉장개위이적영향.결과표명:수착강섬유체적솔적증가,강섬유고강혼응토단렬인도증익비기본정선성증가,림계렬봉첨단화림계렬봉취장개위이분별정지수형증가.유효렬봉장도추우은정치,기본불수강섬유체적솔변화적영향.재분석시험결과적기출상,건립료강섬유고강혼응토유효렬봉장도、단렬인도화림계렬봉장개위이적계산공식.
Through the three-point bending test on 50 specimens of steel fiber reinforced high strength concrete (SFHSC) with the size of 100 mm× 100 mm ×515 mm, the effect of the fiber volume fraction (pf) upon the effective crack length (al) fracture toughness (KIc) and critical crack opening displacement (δc) of high strength concrete (HSC) was studied. The results show that the increment ratio of the KIc of SFHSC increases linearly with the increase of pf. The critical crack tip opening displacement (δt) and the critical crack mouth opening displacement (δm) of SFHSC increase exponentially with the increase of pf. The al is basically close to a stable value. Based on the test results, the formulae were established for calculating al, KI c and δc (δt and δm).
