【摘要】 为了研究结构在油气火灾条件下的连续倒塌行为,该文采用碳氢化合物燃烧的升温曲线,通过显式动力分析,对三层抗弯钢框架的完整失效过程进行了分析。给出了结构内部不同位置处构件内力、变形等随温度的变化情况。同时,采用标准升温曲线对结构进行加热,对比分析不同升温速度和最高温度对结构火灾行为产生的影响。分析结果表明,初始升温速率越快,达到的温度越高,结构就会越快的进入到失效状态,在分析研究中应注意对这两个因素加以考虑。更多还原

【Abstract】 The full failure process of a moment-resistance frame is analyzed using explicit dynamic analysis in order to investigate the progressive collapse behaviour of a steel frame structure under oil and gas fire. The oil or gas fire is expressed as a hydrocarbon combustion fire temperature-rise curve. The variations of member internal-force and deformation against temperature are obtained. ISO834 standard fire temperature-rise curve is used in order to research the influence of different heating rates and maximum temperature on structure fire responses. The analysis results show that the different heating rates and maximum temperature will lead to different time to enter a failure state. The two factors should be taken into account in fire analysis.更多还原