带裂缝钢筋混凝土T形梁力学性能试验研究  

Experimental Research on RC T-Shape Beams with Existing Cracks

作　　者：李向民[1,2] 郑玉庆[1,2] 许清风[1,2] 

机构地区：[1]上海市建筑科学研究院,上海200032 [2]上海市工程结构新技术重点实验室,上海200032

出　　处：《工程抗震与加固改造》2010年第5期43-46,共4页Earthquake Resistant Engineering and Retrofitting

基　　金："十一五"国家科技支撑计划项目(2006BAJ03A10)

摘　　要：为了解既有裂缝对钢筋混凝土T形梁受力性能的不利影响,进行了5根带裂缝(裂缝宽度0.3mm～0.4mm)混凝土T形梁受力性能的对比试验研究。重点研究了既有裂缝对混凝土T形梁受力性能的不利影响。研究结果表明,带裂缝混凝土T形梁的屈服荷载略有降低,降低幅度为4.8%～7.1%;极限承载力无明显变化;极限位移有明显提高,平均提高40.5%;延性系数有亦有明显提高,提高幅度为4.5%～77.1%,平均提高49.6%。T-shape RC beams usually had cracks because of deformation,aging and overloading.Five specimens have different existing cracks are tested to investigate the unfavorable effect of existing cracks,and the width of existing cracks is 0.3 ～ 0.4mm.The yield load-bearing capacities of T-shape RC beams with existing cracks have 4.8 ～ 7.1% decreases over the control specimen,and the ultimate load-bearing capacities have no obvious decreases.The ultimate deformations have an obvious increase,and the evenly increase is 40.5%.The ductility of cracked specimens have 4.5 ～ 77.1% increase and the evenly increase is 49.6%.

关 键 词：既有裂缝 T形梁 力学性能 延性 

分 类 号：TU375.1[建筑科学—结构工程]