含有改性混凝土叠合层的T形梁抗裂性能研究  

Study of crack resistance of modified concrete layers reinforced composite T-beams

作　　者：王伯昕[1,2] 黄承逵[1] 何化南[1] 杨成蛟[1,3] 陈生年[1,4] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]吉林大学建筑工程学院,吉林长春130026 [3]沈阳都市建筑设计有限公司,辽宁沈阳110015 [4]沈阳铝镁设计研究院,辽宁沈阳110001

出　　处：《大连理工大学学报》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)

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.

关 键 词：钢纤维 自应力混凝土 抗裂 叠合梁 负弯矩区 

分 类 号：TU528.571[建筑科学—建筑技术科学]