摘要
为发挥钢-混组合结构优良性能及装配式结构施工节能、质量可控的优势,满足建筑模块化、工业化发展需求,提出螺栓连接装配式双槽钢拼合部分包裹混凝土(PEC)组合柱,开展1个纯钢拼合柱、5个组合拼合柱轴心受压及偏心压弯性能试验,结合数值模拟对组合柱破坏形态、应变发展规律、变形性能和承载能力进行分析研究,揭示了螺栓间距、混凝土外伸宽度、相对偏心距大小等因素对双槽钢拼合柱受压力学性能的影响规律.研究结果表明:轴心受压双槽钢拼合柱破坏模式均为整体失稳破坏,偏心受压双槽钢拼合柱均为压弯破坏,使用钢板及螺栓能可靠连接构件,加载过程双肢未发生分离;加密螺栓间距能有效增强组合柱峰后延性,在一定间距范围内构件具较高刚度,由1000mm加至500 mm极限承载力提高4.43%;开孔钢板连接件能约束且保证混凝土与型钢协同工作,破坏阶段前混凝土与型钢未出现明显黏结分离;混凝土外伸宽度增加能提高构件稳定性能.提出考虑单肢影响的轴压承载力计算方法与基于Eurocode 4规范双槽钢拼合柱轴力-弯矩(N-M)相关曲线,理论结果与试验吻合较好,可为装配式拼合柱设计应用提供理论支撑.
To satisfy the development requirements of building modularization and industrialization,give full play to the excellent performance of steel reinforced concrete composite structures and exploit the advantages of prefabricated structures(e.g.,energy saving in construction and controllable quality),a prefabricated double-channel-steel partially encased concrete(PEC)composite column with bolt connections was proposed in this paper.One steel column and five composite columns were tested under axial compression and eccentric compression.The corresponding damage pattern,strain development law,deformation behavior and bearing capacity were analyzed and studied by combing numerical simulations,and the effects of factors including bolt spacing,concrete projection width and relative eccentricity on the mechanical properties of columns were revealed.Results indicate that the composite columns under axial compression failed by overall buckling,while those under eccentric compression failed by flexural compression.The components can be connected reliably with steel plates and bolts,and the limbs did not separate during the loading process.A decrease in bolt spacing can effectively enhance the post-peak ductility of composite columns.The composite columns had a high stiffness within a certain spacing range,and the ultimate bearing capacity increased by 4.43%when the spacing was reduced from 1000 mm to 500 mm.The perforated steel plate connectors can confine and ensure the cooperation between concrete and profiled steel,and no obvious bond separation between concrete and profiled steel occurred before the failure stage.In addition,a larger concrete projection width can also improve the stability performance of components.Finally,a calculation method for the axial compression bearing capacity considering single-limb effect and an axial force-bending moment(N-M)interaction curve based on Eurocode 4 for channel steel composite columns were proposed.The theoretical results were in good agreement with the experimental results,providing a theoretical support for the design and application of prefabricated composite columns.
作者
周凌宇
刘家豪
方蛟鹏
刘晓春
石敬州
戴超虎
Zhou Lingyu;Liu Jiahao;Fang Jiaopeng;Liu Xiaochun;Shi Jingzhou;Dai Chaohu(School of Civil Engineering,Central South University,Changsha 410075,China;China National Engineering Laboratory of High-Speed Railway Construction Technology,Changsha 410075,China;3rd Construction Co.,Ltd.,China Construction Fifth Engineering Division Corp.,Ltd.,Changsha 410004,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2024年第6期642-653,共12页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51978662)
中建五局科研项目(cscec5b-2021-05).
关键词
装配模块化
部分包裹混凝土柱
螺栓连接
承载性能
prefabricated modularization
partially encased concrete(PEC)column
bolt connection
bearing capacity
作者简介
周凌宇(1973-),男,博士,教授,zhoulingyu@csu.edu.cn;通信作者:刘晓春,xchliu@csu.edu.cn.
