摘要
圆钢管RPC柱可为大跨、高层与高耸建筑、重载工程建设提供性能优越的竖向构件.现有圆钢管RPC轴压短柱承载力计算公式适用于直径不大于152 mm的钢管RPC柱,对大直径钢管RPC柱,计算值偏大.为研究大直径圆钢管RPC轴压短柱承载力计算公式,利用ABAQUS有限元软件,建立了圆钢管RPC轴压短柱分析模型,完成了134种钢管RPC轴压短柱受力全过程分析,研究了RPC相对约束应力与钢管位移曲线的关系,揭示了套箍系数、核心RPC强度等对其荷载-位移曲线的影响规律.结果表明:当套箍系数小于0.5时,钢管RPC柱荷载-位移曲线不存在强化段;当套箍系数大于0.5时,钢管RPC柱荷载-位移曲线出现强化段;当套箍系数达到1时,强化段极限荷载相对于承载力的提升将超过30%,延性更好.相同截面尺寸的圆钢管RPC柱,随核心RPC轴心抗压强度降低,其横向变形系数增大,钢管对核心RPC的约束作用增强.基于试验和数值分析结果,提出了直径达560 mm圆钢管RPC轴压短柱极限承载力计算公式.
RPC-filled circular steel tube columns can be applied in long-span buildings, high-rise structres, and heavy loading constructions due to its excellent mechanical peffommnce as vertical members. Cmwently, the fommla of load-bearing capacity of RPC-filled circular steel tube column under axial compression is only applicable for the ones with a diameter less than 152 ram. When the diameter is larger than 152 ram, the calculated value is larger than test data. To solve this problem, finite element analysis on RPC-filled circular steel tube columns under axial compression was conducted using ABAQUS. The relationship of RPC confining stress ratio and RPC-filled circular steel tube column displacement cmv-es we~ investigated. A total of 134 load-displacement cmv-es of RPC- filled circular steel tube columns were calculated. Results show that when the confinement index is less than 0.5, there is no strengthening stage in load-displacement cmv-es of the RPC-filled circular steel tube columns; when the confinement index is larger than 0.5, the strengthening stage in load-displacement curves occmws; when the confinement index ~aches 1, the uhimate load increases as much as 1.3 times that of the loading bearing capacity, and the ductility becomes higher. With same cross section of RPC-filled circular steel tube column, the lateral defommtion coefficient and the confinement effect on core RPC increase with the decrease of RPC strength. Based on the results of experimental and numerical analysis, the calculation fommla on bearing capacity of RPC-filled circular steel tube column under axial compression with diameter as large as 560 mm were proposed.
作者
戎芹
曾宇声
侯晓萌
菅伟
郑文忠
RONG Qin1,2, ZENG Yusheng2, HOU Xiaomeng2, JIAN Wei2, ZHENG Wenzhong3(1. School of Architecture and Civil Engineering, Harbin University of Science and Technology, Harbin 150080, China; 2. Key Lab of Structures Dynamic Behavior and Control （Harbin Institute of Technology）, Ministry of Education, Harbin 150090, China; 3. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters （ Harbin Institute of Technology,） , Ministry of Industry and hfformation Technology, Harbin 150090, China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2018年第12期61-66,共6页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(51408167)
黑龙江省自然科学基金(QC2017058)
黑龙江省青年创新人才培养计划(UNPYSCT-2017085)
关键词
圆钢管RPC
轴压
有限元
套箍系数
承载力
RPC-filled circular steel tube
axial compression
finite element
confinement index
bearing capacity
