纯弯钢梁整体稳定有限元计算分析

Finite Element Analysis of Overall Stability of Pure Bending Steel Beam

摘要:

使用有限元进行梁单元整体稳定分析时，为得到不同单元类型的计算精度，对工字形截面（开口截面）与箱形截面（闭口截面）进行纯弯作用下整体稳定分析，分别使用6自由度梁单元、7自由度梁单元、板单元进行数值计算，并与理论计算对结果进行分析对比。根据分析得到不同截面类型适用的有限元模型：对于开口截面，计算受弯、压弯稳定时，应采用7自由度单元；对于闭口截面可偏安全的采用6自由度单元计算。

Abstract:

When the finite element is used to analyze the overall stability of the beam element, in order to obtain the calculation accuracy of different element types, the overall stability of the I-shaped section (open section) and the box section (closed section) under the pure bending is analyzed. The 6-DOF beam element, the 7-DOF beam element and the plate element are used for numerical calculation, and the results are analyzed and compared with the theoretical calculation. According to the analysis, the finite element models suitable for different cross-section types are obtained. For the open section, the 7-DOF element should be used when calculating the bending and compression-bending stability. For the closed section that can be biased safely, 6-DOF element is used to calculate.