摘要
基于8根混凝土倒T形叠合梁受弯试验,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形梁,从而形成的叠合梁在负弯矩区的抗裂性能.试验结果表明,仅占叠合梁高13.9%的叠合层将梁的开裂弯矩提高44.9%.同时根据已有理论模型,推导了自应力混凝土叠合T梁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.
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.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2009年第6期897-901,共5页
Journal of Dalian University of Technology
基金
辽宁省交通厅重点科研基金资助项目(200514)
关键词
钢纤维
自应力混凝土
抗裂
叠合梁
负弯矩区
steel fiber
self-stressing concrete
crack resistance
composite beam
negative moment area
