摘要
基于约束混凝土提出一种由钢筋、混凝土及缠绕管组成的内置复合材料管局部约束混凝土组合柱(ConcreteEncased FRP Confined Concrete Sub-Columns/Cores Column,简称"CEFC"),本构件截面形式为外围的钢筋混凝土类方柱和内置于4角点的FRP管约束混凝土圆柱(Concrete-Filled FRP Tube,简称"CFFT")组合而成。通过试验研究及有限元数值模拟对钢筋混凝土柱及内置复合管局部弱约束混凝土方柱进行了轴偏压作用下力学行为的分析和比较。结果表明,弱约束CEFC典型破坏模式为局部破坏,内置CFFT可较好延缓构件整体破坏。CEFC在轴压和偏压作用下延性都有所提高,且在偏压作用下CEFC具有明显的二阶刚度,且承载力具有小幅度提高。
A novel column named concrete-encased FRP confined concrete sub-columns / cores column（ CEFC）consisting of steel rebar,concrete and fiber-reinforced polymer（ FRP） tube is presented. The sectional form of CEFC consists of the outer common reinforced columns（ RC） and 4 inner Concrete-Filled FRP Tubes（ CFFT）,which located near 4 corners of square CEFC. The compression performance of RC and CEFC were studied and compared through experiment and Finite Element Method（ FEM）. The result indicates that the typical failure mode of CEFC with weak confine was local crushing and overall damage of CEFC was prevented by CFFT. What＇ s more,ductility of CEFC was improved. Moreover,second order stiffness and enhancement of strength were observed when CEFC was under eccentric compression.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2016年第9期17-25,共9页
Fiber Reinforced Plastics/Composites
基金
国家自然科学基金项目(51308287)
江苏省自然科学基金项目(BK20130936)
关键词
复材管
局部约束
组合柱
延性
破坏模式
FRP tube
FRP confined concrete cores column
composites columns
ductility
failure mode
