摘要
了解钢骨-钢管混凝土柱在低周往复荷载作用下的力学性能,为钢骨-钢管混凝土柱的推广应用提供依据。本文对5根构件开展拟静力试验并对试验结果进行了分析,得到不同轴压比和不同含骨率下的荷载-位移滞回曲线,并分析比较了轴压比和含钢率对构件耗能及延性的影响。结果表明,钢骨-钢管混凝土柱抗震性能良好,含骨率的增加和轴压比的减小都有利于试件承载力的提高;随着试验位移增大,试件累积耗能和等效粘滞阻尼系数都增大,表明试件耗能能力不断增大,如此就能有效地抵御地震作用,而且试件轴压比越小,含骨率越大试件的耗能能力越强;含骨率的增大可以减缓试件的刚度退化,轴压比的减小对减缓刚度退化影响显著;即使在高轴压比下钢骨-钢管混凝土柱仍能满足规范对抗震极限位移角的要求,试件延性系数随含骨率增大而增大,随轴压比的增大而减小。
To understand mechanical properties of circular steel tube composite columns filled with steel reinforced concrete under cyclic loading,the tests were conducted, which provide basis for the application of these columns. Five circular steel tube composite columns filled with steel reinforced concrete under horizontal cyclic loading are tested, and the hesteretic curves of the columns with different steel ratios under different compression ratios are obtained. The effects of different axial compression ratios and the ductility and energy dissipation capacity are analysed and compared. The results show that circular steel tube composite columns filled with steel reinforced concrete behave very well. Either increasing the steel ratio or reducing the axial compression ratio is favorable to improve the element bearing capacity. With the increasing of displacement, energy dissipation capacity and equivalent viscous damping ratio are increased, the energy dissipation capacity is growing, which can effectively resist earthquakes. It is also found that the energy dissipation capacity is better with the reducing of the axial compression ratio and the increasing of the steel ratio, and either increasing the steel ratio or reducing the axial compression ratio is favorable to delay the stiffness degradation. The circular steel tube composite column filled with steel reinforced concrete can still meet the standard requirements on limiting displacement drift even under the high axial compression ratio. The ductility is increasing with the increment of steel ratio, but decreasing with the increment of axial compression ratio.
出处
《建筑钢结构进展》
2009年第3期4-11,共8页
Progress in Steel Building Structures
基金
辽宁省教育厅科研计划资助项目(20060691)
关键词
抗震性能
耗能
刚度退化
延性
seismic performance
energy dissipation
stiffness degradation
ductility
