This paper seeks to gain an in-depth understanding of the seismic behavior of oval hollow section (OHS) beam-columns through experimental and numerical investigations. Quasi-static tests on nine OHS beam-column specimens with varying tube thicknesses, axial load ratios and bending directions are conducted, where the failure mode, yield/ultimate strength, ductility, and energy dissipation-related quantities are discussed in detail. Following the experimental program, a numerical study on a total of 360 OHS beam-column models with broadened section and material parameters is further conducted, and design recommendations for OHS beam-columns subjected to seismic conditions are proposed. Among other findings, the study reveals that local buckling at the fixed base is the governing failure mode for the considered members, but the failure mechanism varies under different bending directions. The flat web plate of the OHS is a critical area which is prone to local buckling, although stable post-buckling behavior can be exhibited. Earlier local buckling and more severe damage to the column base are induced when the axial load increases, resulting in decreased ductility. The plastic moment resistance is better mobilized with the increase in the tube thickness and when under major axis bending. The parametric study finally leads to practical ductility-oriented and strength-oriented design curves, where both least-square regression and lower-bound solutions are provided.

本文试图通过实验和数值研究来深入了解椭圆形空心截面（OHS）梁柱的抗震性能。对9个具有不同管厚度，轴向载荷比和弯曲方向的OHS梁柱试样进行了准静态测试，其中详细讨论了失效模式，屈服/最终强度，延性和与能量耗散相关的量。根据实验程序，进一步对总共360个具有扩大的截面和材料参数的OHS梁柱模型进行了数值研究，并提出了在地震条件下的OHS梁柱的设计建议。研究还发现，在其他发现中，固定基座的局部屈曲是考虑成员的主导失效模式，但破坏机理在不同的弯曲方向上会有所不同。尽管可以表现出稳定的后屈曲性能，但OHS的平板腹板是易于局部屈曲的关键区域。当轴向载荷增加时，会导致较早的局部屈曲和对柱基的更严重损坏，从而导致延展性降低。随着管厚度的增加以及在主轴弯曲下，抗塑性力矩的能力更好地发挥。该参数研究最终得出实用的延性导向和强度导向的设计曲线，其中提供了最小二乘回归和下界解。当轴向载荷增加时，会导致较早的局部屈曲和对柱基的更严重损坏，从而导致延展性降低。随着管厚度的增加以及在主轴弯曲下，可抵抗塑性力矩的能力更好。该参数研究最终得出实用的延性导向和强度导向的设计曲线，其中提供了最小二乘回归和下界解。当轴向载荷增加时，会导致较早的局部屈曲和对柱基的更严重损坏，从而导致延展性降低。随着管厚度的增加以及在主轴弯曲下，可抵抗塑性力矩的能力更好。该参数研究最终得出实用的延性导向和强度导向的设计曲线，其中提供了最小二乘回归和下界解。