钢管混凝土柱-RC梁平面框架耐火性能分析

ANALYTICAL BEHAVIOUR OF CONCRETE FILLED STEEL TUBULAR COLUMN-REINFORCED CONCRETE BEAM PLANAR FRAMES SUBJECTED TO FIRE

建立了外荷载和升、降温火灾共同作用下钢管混凝土柱-钢筋混凝土梁平面框架结构的有限元分析模型,用已有试验数据对模型进行了验证。在有限元模型基础上,对钢管混凝土柱-钢筋混凝土梁平面框架在ISO-834标准升、降温火灾下的力学性能进行了分析,研究了梁荷载比、柱荷载比和升温时间比等参数的影响规律。分析结果表明该组合框架不仅会在升温过程中破坏,也会在降温过程中破坏。该组合框架是否会在降温段发生破坏,跟梁荷载比、柱荷载比和升温时间比有关。

This paper develops a finite element analysis(FEA) model for concrete filled steel tubular column-reinforced concrete beam planar frames under coupled loading and fire with heating and cooling phase. The modeling is validated against existing test data. Based on the FEA model, the mechanical behavior of the composite frame under ISO-834 standard heating and cooling fire is analyzed, and the influences of beam load ratio, column load ratio, and heating time ratio are investigated. The results indicate that the composite frame will fail in both the heating and cooling phases. Whether or not the composite frame reaches its failure in cooling phase is related to beam load ratio, column load ratio, and heating time ratio.