CAJ | 학술논문

基于8根混凝土倒T形叠合粱受弯试验,研究了钢筋钢纤维自应力混凝土做加固材料层二次浇注到待加固混凝土T形粱,从而形成的叠合梁在负弯矩区的抗裂性能.试验结果表明,仅占叠合粱高13.9%的叠合层将粱的开裂弯矩提高44.9%.同时根据已有理论模型,推导了自应力混凝土叠合T粱后加自应力的求法和负弯矩区正截面抗裂计算公式,其计算结果与试验结果比较吻合.
기우8근혼응토도T형첩합량수만시험,연구료강근강섬유자응력혼응토주가고재료층이차요주도대가고혼응토T형량,종이형성적첩합량재부만구구적항렬성능.시험결과표명,부점첩합량고13.9%적첩합층장량적개렬만구제고44.9%.동시근거이유이론모형,추도료자응력혼응토첩합T량후가자응력적구법화부만구구정절면항렬계산공식,기계산결과여시험결과비교문합.
Based on the experiments of 8 composite concrete inverted T-beams, crack resistance in negative moment area of the beams reinforced steel fiber self-stressing concrete layer was investigated. The test results obviously indicate that the composite layers enhance the cracking moments 44. 9% more than that of common concrete layers, though its height is only 13.9% of the cross section height. Meanwhile according to the existing theoretical models, a procedure to determine the self-stress is supplied and a formula which evaluates the crack resistance of composite T-beams in negative moment area is deduced, and the calculated results agree well with the test results.