构造钢筋影响下新老混凝土结合面抗剪试验研究  

Experimental research on shear of bonding interface between young and old concrete influenced by constructional reinforcement

作　　者：胡铁明[1,2] 黄承逵[1] 陈小锋[1,3] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116023 [2]沈阳大学建筑工程学院,辽宁沈阳110044 [3]成都基准方中建筑设计事务所,四川成都610015

出　　处：《混凝土》2009年第3期26-28,共3页Concrete

基　　金：辽宁省交通厅科研重点项目(200514)

摘　　要：研究构造钢筋对新老混凝土结合面抗剪性能的影响。对30个试件进行剪切试验,分析了3种形状构造钢筋在新老混凝土结合面开裂前后的抗剪性能,并与无构造钢筋的新老混凝土结合试件及整体试件抗剪强度进行了对比。试验结果表明:构造钢筋可有效提高结合面抗剪强度,配筋率为0.34%时,抗剪强度可提高81.1%;锚固条件良好的构造钢筋可使结合面具有较高的抗剪强度和较强的耗能能力,而锚固不足则可导致钢筋对结合面抗剪贡献的降低,配筋率为0.34%时,二者抗剪强度提高值相差达42.9%。The effect of constructional reinforcement on the shear property of young and old concrete bonding interface was studied.The shear tests were done to 30 specimens, the shear properties of bonding interfaces of 3 shapes constructional reinforcement before and atter being crack- ing were analyzed, and their shear strengths were compared with young and old concrete bonding specimen without constructional reinforcement and whole specimen.The results show that constructional reinforcement can enhance the shear strength of bonding interface, the strength increases 81.1% by the steel fiber ratio of 0.34% ; welt-anchoring constructional reinforcement has better shear strength and energy dissipation, on the con- wary, lack of anchorage depress the effect of reinforcement on shear property.When the steel fiber ratio is 0.34%, the value difference between two strengths is 42.9%.

关 键 词：新老混凝土 构造钢筋 结合面 抗剪性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]