带裂缝RC双向现浇板力学性能试验研究  

Experimental Research on Mechanical Properties of RC Two-way Cast-in-situ Slab with Existing Cracks

作　　者：李向民[1,2] 殷杰[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47-51,共5页Earthquake Resistant Engineering and Retrofitting

基　　金："十一五"国家科技支撑计划项目(2006BAJ03A10)

摘　　要：钢筋混凝土双向现浇板由于变形、收缩和超载而常常出现各种裂缝。为了解既有裂缝对RC双向现浇板受力性能的不利影响,本文进行了6块带裂缝RC双向现浇板受力性能的对比试验研究,重点研究了既有裂缝对RC双向现浇板受力性能的不利影响。研究结果表明,带裂缝RC双向现浇板的极限承载力有所降低,降低幅度为2.5%～12.7%;破坏时的跨中挠度明显增大,增大幅度达17.4%～51.7%;相同荷载作用下板底跨中钢筋的受拉应变明显增大。而既有裂缝对RC双向现浇板的破坏模式没有明显影响。RC two-way cast-in-situ slabs usually had cracks because of deformation,shrinkage and overloading.Six specimens have different existing cracks are tested to investigate the unfavorable effect of existing cracks.The ultimate load-bearing capacities of RC two-way cast-in-situ slabs with existing cracks have 2.5% ～ 12.7% decreases over the control specimen,meanwhile the ultimate deformation in middle-span have 17.4 ～ 51.7% increase.The tensile strain of lower middle-span steel bar along longer direction is bigger than the control specimen.And the existing cracks have no obvious effect on failure mode of RC two-way cast-in-situ slab.

关 键 词：既有裂缝 RC双向现浇板 力学性能 破坏模式 

分 类 号：TU375.2[建筑科学—结构工程]