火灾作用下钢筋混凝土连续梁内力重分布研究

Investigation into internal force redistribution into reinforced concrete continuous beam in fire

根据材料在不同温度下的本构模型,对钢筋混凝土连续梁的抗火性能进行了非线性分析。通过计算火灾作用下钢筋混凝土连续梁的高温极限承载力和力学性能,分析了不同加载位置、荷载大小和加温跨数下内力重分布和变形的变化规律。结果表明,在升温过程中,不同的加载位置和加载水平使得连续梁发生剧烈的内力重分布,并产生可变的高温塑性铰,从而改变结构的破坏形态。

The non-linear fire-resistant properties of continuous beams were analysed, according to the constitutive models of material at different temperatures. By calculating the ultimate loads and mechanical properties of reinforced concrete continuous beam at high-temperature, the change law of internal force redistribution and deformation were analyzed for different loading positions and levels and different numbers of heated spans. The resutt shows that, in heating process, the internal force redistribution and the formation of plastic hinges at high temperature in continuous beam were caused by different loading position and level, which can change the failure pattern of structure.