热-湿-力耦合作用对高温后方钢管混凝土短柱轴压力学性能影响试验研究
Experiment of Heat-Moisture-Force Coupling Effect on Mechanical Behavior of Square Concrete-Filled Steel Tubular Stub Columns Under Axial Compression After High Temperature
薛媛媛 1钟水溶 2霍静思 3陈俊 4蔡祖荣5
作者信息
- 1. 湖南城建职业技术学院 建筑工程系,湖南 湘潭 411101
- 2. 深圳地铁建设集团有限公司,广东 深圳 518038
- 3. 华侨大学 土木工程学院,福建 厦门 361021
- 4. 湘潭大学 土木工程学院,湖南 湘潭 411105
- 5. 湖南建投地产集团有限公司,长沙 410026
- 折叠
摘要
火灾发生时钢管混凝土内部会产生水蒸气,为探讨热-湿-力耦合作用对高温后方钢管混凝土轴压力学性能的影响,进行了10根高温后方形钢管混凝土短柱轴压力学性能试验,研究排气孔数量、布置位置、轴压比和升温时间等参数对其破坏形态、轴压刚度与剩余承载力等力学性能的影响.试验结果表明,试件破坏形态表现为压溃破坏;在其他参数相同的情况下,与升温前相比,随着排气孔数量从2个增加至4个和6个,轴压刚度分别降低了69.1%、73.3%、76.4%,剩余承载力分别降低了15.8%、16.2%、21.7%.轴压刚度随轴压比的增大而降低;随着升温时间的延长,剩余承载力先随轴压比的增大而增大,后随轴压比的增大而减小.研究结果可为钢管混凝土柱的抗火设计和该类结构火灾后的损伤评估与加固提供参考.
Abstract
Water vapor will be generated inside the concrete-filled steel tube(CFST)when fire occurs.In order to explore the heat-moisture-force coupling effect on mechanical behavior of CFST subjected to axial compressive load after high temperature,the tests of 10 square CFST columns under axial compression after high temperature were conducted.The effect of factors such as the number and arrangement position of air venting holes,axial compression ratio and heating time on the mechanical behavior of failure mode,axial compression stiffness and residual bearing capacity was analyzed.The results show that the failure mode is shown as crush failure mode.Under the same condition of other parameters,compared with that before heating,the axial compression stiffness decreased by 69.1%,73.3%,and 76.4%,respectively,and the residual bearing capacity decreased by 15.8%,16.2%,and 21.7%,respectively,with the increase of the number of venting holes from 2 to 4 and 6.The axial stiffness decreases with the increase of the axial compression ratio.With the extension of the heating time,the residual bearing capacity firstly increases and then decreases with the increase of axial compression ratio.The results of this paper can provide a reference for the fire resistance design of CFST columns and the damage assessment and strengthening of such structures after fire.
关键词
热-湿-力耦合作用/方钢管混凝土/高温后/轴压/力学性能Key words
heat-moisture-force coupling effect/square concrete-filled steel tube(CFST)/after high temperature/axial compression/mechanical behavior引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据