高轴压比下焊接环式高强复合箍筋约束高强混凝土柱裂缝发展规律  

LAW OF CRACKS DEVELOPMENT OF HIGH CONCRETE COLUMNS CONFINED BY WELDED RING HIGH COMPOSITE STIRRUPS UNDER HIGH AXIAL COMPRESSIVE RATIO

作　　者：沈凌武 李升才[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《工业建筑》2016年第2期58-62,共5页Industrial Construction

基　　金：国家自然科学基金资助项目(51578253);泉州市校地协同创新专项资助项目(2015Z143)

摘　　要：为研究高轴压比下焊接环式高强复合箍筋约束高强混凝土柱的破坏形态、极限承载力、裂缝发展过程及发展规律,对9个1/2模型的焊接环式高强复合箍筋约束高强混凝土柱和1个1/2模型的普通非闭合箍筋约束的高强混凝土柱进行低周反复水平加载试验。试验表明:焊接环式高强复合箍筋约束高强混凝土柱的裂缝发展比较缓慢;随着轴压比的增大,核心区混凝土弯曲裂缝出现滞后,受压区的竖向裂缝增多;配箍率相同的情况下,随着轴压比的增大,极限荷载略有下降;该类柱表现出理想的弯曲破坏模式。In order to study the failure modes, ultimate bearing capacity, the development process and the development law of cracks in high strength concrete columns it was made that 9 1/2 scale high-strength concrete column specimens confined by the ring stirrups and a 1/2 scale high-strength concrete column specimen confined by ordinary stirrups, for which low frequency cyclic loading tests were done. The results showed that the development of the crack in the 9 specimens was relatively slow. With the increase of axial compression ratio, bending cracks of concrete in core zone lagged, and the vertical cracks in the compressive zone were increased under the same circumstances, with the increase of axial compression ratio, the ultimate load was decreased slightly, this sort of column showed the ideal bending failure mode.

关 键 词：高强混凝土柱 约束混凝土 焊接环式高强复合箍筋 低周反复荷载 裂缝过程 破坏模式 

分 类 号：TU375.3[建筑科学—结构工程]