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根据考虑几何和材料非线性及温度沿杆件截面高度线性分布等因素对钢结构常温和高温响应影响的基本方程,用自行编制的计算程序对单层双跨钢框架进行结构非线性温度响应研究,分析了弯曲应变、屈强比、梁柱刚度比、初始弹性模量等因素对结构响应的影响,并研究了温度步长、保护层厚度对结构耐火时间的影响。由计算结果发现,弯曲应变、初始弹性模量、梁柱线刚度比对梁跨中挠度及边柱柱顶水平位移影响较大,而对柱顶竖向位移影响不明显;当结构有防火保护层时,时间步长对结构耐火时间的影响不大,而保护层厚度对结构耐火时间的影响较明显。
According to the basic equations which consider the influence of geometry and material nonlinearity and the temperature distribution along the cross section of the bar on the room temperature and high temperature response of the steel structure, the nonlinear temperature response of the single double-span steel frame The effects of bending strain, yield ratio, beam-column stiffness ratio, initial elastic modulus and other factors on the structural response were analyzed. The influence of temperature step and protective layer thickness on the structural fire resistance was also studied. From the calculation results, it is found that the bending strain, the initial elastic modulus and the stiffness ratio of the beam and column have a greater influence on the mid-span deflection and the horizontal displacement of the side column but not the vertical displacement. When the structure has fire protection Layer, the time step on the structure of fire resistance time is not significant, and the protective layer thickness of the structure of the fire resistance time is more obvious.