钢结构高温响应影响因素的研究

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。

Influence Parameters on Temperature Response of Steel Structure

Based on the basic equations of the nonlinear response of steel structures at the room temperature and high temperature,in which the effects of different factors,such as the geometric and material nonlinearity,the linear distribution of temperature along the longitudinal section are introduced,an computational program is developed and applied to investigate the nonlinear temperature response of one-story-two-span steel frame structures.The influence of the bending strain,the yielding-strength ratio,the stiffness ratio of beam to column and the initialize elastic module are analyzed,and the influence of the temperature step and the protection thickness on the fire resistance time of the structure is investigated too.The analysis results show that the bending strain,the yielding-strength ratio,the stiffness ratio of beam to column have evident effect on the middle deflection of beams and the top horizontal displacement of the side column,while have little effect on the top vertical displacement of the column.For these structures with the fire protection,the time step has little effect on the fire resistance time,while the effect of the protection thickness is evident.