高强箍筋约束高强混凝土柱轴压性能研究  

Study on the axial compression behavior of high strength concrete columns confined by high strength stirrups

作　　者：林智雄 林宇洪 邹文平 卢志达 LIN Zhixiong;LIN Yuhong;ZOU Wenping;LU Zhida(School of Transportation and Civil Engineering,Fujian University of Agriculture and Forestry,Fujian Construction Engineering Group Co.,Ltd.,Fuzhou 350003,China;Fujian Construction Engineering Group Co.,Ltd.,Fuzhou 350003,China)

机构地区：[1]福建农林大学交通与土木工程学院,福建福州350108 [2]福建建工集团有限责任公司,福建福州350003

出　　处：《混凝土》2022年第3期30-34,共5页Concrete

基　　金：国家自然科学基金面上项目(51578154,51878176)。

摘　　要：共设计了11组高强箍筋约束高强混凝土短柱,对比分析了箍筋间距、箍筋强度、混凝土强度和配箍形式对高强箍筋约束高强混凝土试件破坏形态和轴压性能的影响。结果表明,高强箍筋约束高强混凝土试件的核心混凝土的裂缝形状主要为H型和N型,破坏形态都为柱状压坏,试验结束后核心约束混凝土较为完整,复合箍筋的约束效果较好;混凝土强度提升可以增加试件的极限承载力,但素混凝土强度为C50时约束效果提升系数最大;箍筋间距减小、箍筋强度提升和采用内圆外方箍筋形式都有助于提升高强箍筋约束高强混凝土试件的极限承载力并增加延性,从而增强框架柱结构在地震载荷作用下的可靠性。A total of 11 groups of high-strength stirrup confined short columns are designed,and the influences of stirrup spacing,stirrup strength,concrete strength and stirrup form on the failure mode and axial compression performance of high-strength stirrup confined high-strength concrete specimens are compared and analyzed.The results show that the crack shapes of core concrete confined by high-strength stirrup are mainly H-type and N-type,and the failure forms are all column like compression.After the test,the core confined concrete is relatively complete,and the constraint effect of composite stirrup is better.The ultimate bearing capacity of the test piece can be increased by the increase of concrete strength,but the constraint effect improvement coefficient is the most when the plain concrete strength is C50.The results show that the decrease of stirrup spacing,the increase of stirrup strength and the adoption of internal and external stirrups are all helpful to enhance the ultimate bearing capacity and ductility of high-strength concrete specimens confined by high-strength stirrups,so as to enhance the reliability of frame column structure under seismic load.

关 键 词：高强箍筋 高强混凝土 破坏形态 轴压性能 约束效果 

分 类 号：TU528.571[建筑科学—建筑技术科学]