带裂缝RC矩形梁力学性能的试验研究  

Experimental Research on Mechanical Properties of RC Rectangular 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]上海市工程结构新技术重点实验室,上海200032 [2]上海市建筑科学研究院,上海200032

出　　处：《结构工程师》2010年第2期142-145,共4页Structural Engineers

基　　金："十一五"国家科技支撑计划(2006BAJ03A10)资助

摘　　要：为了解既有裂缝对RC矩形梁受力性能的不利影响,进行了8根带裂缝（裂缝宽度0.7~1.2mm）混凝土矩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矩形梁受力性能、破坏模式和极限承载力的不利影响。研究结果表明,带裂缝RC矩形梁的屈服荷载有所降低,降低幅度为2.4%~22.0%;极限承载力略有降低,降低幅度为0.9%~10.7%;初始刚度略有降低。RC rectangular beams usually have existing cracks because of deformation,shrinkage and overloading.Eight specimens which have different existing cracks were tested to investigate the unfavorable effect of existing cracks,and the width of existing cracks is 0.7~1.2 mm.The yield load-bearing capacities of RC rectangular beams with existing cracks decrease 2.4%~22.0% comparing to the control specimen,meanwhile the ultimate load-bearing capacities decrease 0.9%~10.7%.And the initial stiffness of RC rectangular beams with existing cracks have a slight decrease.

关 键 词：既有裂缝 RC矩形梁 力学性能 破坏模式 

分 类 号：TU375.1[建筑科学—结构工程]