It has been shown that fire disaster normally occurs following an earthquake disaster, which might cause even more serious losses than the earthquake itself. This study investigates the post-earthquake fire performance of concrete-filled steel tube (CFST) columns. The experimental programme contains two parts - quasi-static tests and fire tests. During the quasi-static tests, the square CFST columns were loaded under constant compressive force and cyclic horizontal force, until reaching different degrees of seismic damage. Afterwards, the pre-damaged columns were loaded under a constant axial compression ratio (i.e. ratio of the applied compressive load to its bearing capacity) of 0.3 at elevated temperatures. The fire resistance time and failure modes of these pre-damaged CFST columns were reported. Finite element (FE) models were developed and validated against the test results; a total of 48 numerical results were generated in the parametric study using the validated model. In the parametric study, the influence of key parameters including the thickness of steel tube, the yield strength of steel tube, the axial compression ratio and pre-damage degrees on the fire resistance of square CFST columns were analysed. The experimental and numerical results are used to propose design rules for the fire performance of square CFST columns with different degrees of seismic damage.

已经表明，火灾通常发生在地震灾难之后，这可能比地震本身造成更大的损失。本研究调查了钢管混凝土（CFST）柱的震后防火性能。实验程序包括两部分-准静态测试和防火测试。在准静态测试过程中，方形CFST柱在恒定的压缩力和水平方向的周期性力作用下加载，直到达到不同程度的地震破坏为止。然后，在高温下以0.3的恒定轴向压缩比（即施加的压缩负载与其承载力之比）加载预先损坏的圆柱。报告了这些预损坏的CFST柱的耐火时间和破坏模式。开发了有限元（FE）模型，并根据测试结果进行了验证；使用已验证的模型，在参数研究中总共产生了48个数值结果。在参数研究中，分析了钢管厚度，钢管屈服强度，轴向压缩比和预破坏度等关键参数对方形CFST柱耐火性的影响。实验和数值结果被用来为不同地震破坏程度的方形CFST柱的防火性能提出设计规则。分析了方形CFST柱的轴向压缩比和预破坏度对耐火性的影响。实验和数值结果被用来为不同地震破坏程度的方形CFST柱的防火性能提出设计规则。分析了方形CFST柱的轴向压缩比和预破坏度对耐火性的影响。实验和数值结果被用来为不同地震破坏程度的方形CFST柱的防火性能提出设计规则。