利用ANASYS有限元软件，建立了升温曲线符合ISO834国际标准升温曲线的框架柱结构模型，考虑了材料的热物理参数对其热响应的影响，并就框架柱的温度变化及应力变化进行了分析。结果表明：框架柱接头焊缝处不同点升温曲线基本一致，火灾初期升温较快，后期缓慢，与火灾发展的三阶段性相吻合，火灾发生8.5 min时腹板焊缝中心点温度达600℃；等效应力变化曲线呈“抛物线”状，峰值为170 MPa，通过对接头焊缝的等效应力和力学性能综合分析，获得了框架柱接头处综合力学性能较为合理的焊接速度为4 mm/s，为火灾下建筑物安全和焊接结构生产提供了借鉴和指导。%A model of frame column structure exposed to fire which temperature curve is in agreement with ISO834 international standards of temperature curves is set up with ANSYS finite element software, and considering the influence of material thermal physical parameters on the thermal response of frame column structure, and the temperature and distribution stress are analyzed. The results showed that frame column joint weld temperature curve of different points of frame column weld are almost accordant. Temperature is quickly increased in the beginning, and increase speed is slowed in the ending stage, these are accord with three phases fire development. Temperature is increased to 600 ℃ in the middle of abdomen weld, when the fire goes on 8.5 s. The equivalent stress curve is parabola, and the peak stress is nearly 170 MPa. Equivalent stress and mechanical properties are synthetic analyzed, reasonable welding speed are obtained to 4mm/s, and comprehensive mechanical properties synchronously are gained in the weld joints of frame column structure. These results provide reference and guide for fire building safety and welding production structure.
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