CAJ | 학술논문

为探讨轴力变化对箱形钢柱抗震性能的影响机理，采用有限元法，对5种柱顶偏心变轴力加载模式下箱形钢柱的抗震性能进行了数值分析，探讨了轴力变化对箱形钢柱的荷载-位移滞回曲线、骨架曲线、位移延性系数以及耗能能力的影响规律。研究结果表明：柱顶变轴力加载频率对箱形钢柱抗震性能的影响较大，轴力变化频率越大，构件的抗震性能越差；柱顶轴力的变化幅值越大，箱形钢柱的承载力退化越严重；箱形钢柱的壁板宽厚比越小，轴力变化对构件抗震性能的影响越大。因此制定大跨度空间结构中箱形钢柱的抗震措施时，应充分考虑轴力变化对箱形钢柱抗震性能的影响。
위탐토축력변화대상형강주항진성능적영향궤리，채용유한원법，대5충주정편심변축력가재모식하상형강주적항진성능진행료수치분석，탐토료축력변화대상형강주적하재-위이체회곡선、골가곡선、위이연성계수이급모능능력적영향규률。연구결과표명：주정변축력가재빈솔대상형강주항진성능적영향교대，축력변화빈솔월대，구건적항진성능월차；주정축력적변화폭치월대，상형강주적승재력퇴화월엄중；상형강주적벽판관후비월소，축력변화대구건항진성능적영향월대。인차제정대과도공간결구중상형강주적항진조시시，응충분고필축력변화대상형강주항진성능적영향。
To investigate the influence mechanism of axial force fluctuation on the seismic behaviors of steel box columns,the seismic behaviors of steel box columns under 5 patterns of eccentrically fluctuant axial force were numerically analyzed by finite element simulation. The influence rules of axial force fluctuation on their load-displacement hysteresis loops,skeleton curves,displacement ductility coefficients and energy dissipation capacities were discussed. The research results show that the loading frequency of a fluctuant axial force has an significant effect on the seismic behavior of a steel box column-when the loading frequency increases,the seismic behavior deteriorates rapidly. A large amplitude of the fluctuant axial force results in the severe degeneration of load-bearing capacity of a steel box column. When the width-to-thickness ratio of plates in steel box columns is small,the effects of axial force fluctuation on the seismic behavior become conspicuous. As a result,the adverse effects of axial force fluctuation on the seismic behaviors of the columns should be sufficiently considered when the seismic measures of steel box columns in a large span spatial structure are established.