论文部分内容阅读
通过非线性有限元通用程序ANSYS进行数值分析,首次对单轴对称钢梁在火载荷作用下发生的侧向弯扭屈曲行为进行系统的参数研究,主要考察载荷比、跨度、端部约束条件、温度梯度等因素对钢梁弯扭屈曲失效行为的影响。结果发现:钢梁发生侧向弯扭屈曲的临界温度随温度梯度的增加而提高,但随着载荷比的增大而降低;悬链作用对侧向弯扭屈曲的影响可以忽略;固支梁的抗火性能要优于简支梁;对于两种梁的跨度情形(3m和6m),跨度较大时具有突变特性的侧向弯曲屈曲难以发生,但这种跨度变化并未改变侧向弯扭屈曲这一重要失效形式。
The nonlinear finite element method ANSYS is used to carry out numerical analysis. For the first time, the lateral bending and torsional buckling behavior of uniaxial symmetrical steel beams subjected to fire load is investigated systematically. The main factors such as load ratio, span, end constraints, Influence of Temperature Gradient and Other Factors on Bending and Torsion Failure Behaviors of Steel Beams. The results show that the critical temperature of lateral flexural and torsional buckling of steel beam increases with the increase of temperature gradient, but decreases with the increase of load ratio. The effect of catenary on lateral flexural and torsional buckling can be neglected. (3m and 6m), the lateral flexural buckling with sudden change is difficult to occur when the span is large, but this change in span does not change the lateral bend Buckling this important failure form.