Tubed-reinforced-concrete (TRC) columns are gaining increasing popularity in engineering constructions, however, research on their fire performance is still limited and mainly focused on concentrically-loaded columns. In this study, extensive numerical analysis was carried out to investigate the performance of square and rectangular TRC columns under eccentric loading and exposed to ISO 834 standard fire. A sequentially-coupled thermo-mechanical finite element analysis (FEA) model was developed in ABAQUS and validated well against fire testing results. The high-temperature overall deformations, internal bending moments and cross-sectional load redistributions of square TRC columns with different load eccentricities were analysed. Parametric studies were conducted to investigate the influences of load eccentricity ratio, sectional aspect ratio, bending direction, fire protection thickness, sectional dimension, load ratio and slenderness ratio on the fire resistance of square and rectangular TRC columns. Load eccentricity was found to have a greater effect on the fire resistances of columns of lower slenderness than those of columns of higher slenderness. Rectangular TRC columns of sectional aspect ratios no larger than 2 could generally achieve identical buckling resistance as that of the equivalent square sections. The influences of sectional aspect ratio and bending direction on the column fire resistance were insignificant. A design method was then proposed for both the ambient-temperature and high-temperature designs of eccentrically-loaded square and rectangular TRC columns. The fire design method could cover both protected and unprotected TRC columns. The design method has been thoroughly validated against detailed FEA modelling and yields excellent agreements with the modelling results.

管式钢筋混凝土（TRC）柱在工程结构中越来越受欢迎，但是，其耐火性能的研究仍然有限，并且主要集中在同心荷载柱上。在这项研究中，进行了广泛的数值分析，以研究方形和矩形TRC柱在偏心载荷和暴露于ISO 834标准火焰下的性能。在ABAQUS中开发了一个顺序耦合的热机械有限元分析（FEA）模型，并针对火测试结果进行了很好的验证。分析了不同荷载偏心率的方形TRC柱的高温整体变形，内部弯矩和截面荷载的重新分布。进行了参数研究，以研究载荷偏心率，截面纵横比，弯曲方向，防火厚度，截面尺寸，载荷比和细长比对方形和矩形TRC柱的耐火性。发现负载偏心率对细长度较低的柱的耐火性比较高细长度的柱的耐火性有更大的影响。截面纵横比不大于2的矩形TRC柱通常可以实现与等效正方形截面相同的抗屈曲性。截面纵横比和弯曲方向对立柱耐火性的影响不明显。然后提出了一种偏心加载的方形和矩形TRC柱的常温和高温设计的设计方法。防火设计方法可以覆盖受保护和不受保护的TRC色谱柱。