薄壁箱梁截面抗扭参数的简化计算方法

通过对薄壁箱形截面杆件扭转特性的分析,提出利用空间有限元分析软件的分析功能来计算薄壁箱梁截面几何特性参数的新途径。建立空间悬臂梁模型,其截面为所要计算的薄壁箱形截面,在梁悬臂端施加集中扭矩,根据分析求得梁悬臂端相邻截面的扭转角和截面变形,即可推算出该薄壁箱形截面的抗扭参数。为提高计算精度,可按精确截面形式输入。结果表明:该方法的实施过程简单,计算结果精度高,用户借助于自己熟悉的任何空间有限元分析软件均能实现这一功能。

Simplified Calculation Method for Torsion Parameters of Thin-walled Box Girder Section

A new approach of calculating the geometrical properties of thin-walled box girder section by space finite element analysis software was put forward through analyzing the torsion properties of thin-walled box section member.A space model of cantilever girder was set up whose section was the thin-walled box section for computation.Authors put on a concentrated torsional moment at the end of cantilever.Torsion parameters of thin-walled box section could be calculated according to the neighbouring section torsion angle and section deformation at the end of the girder cantilever.Exactitude section pattern should be input to improve calculation accuracy.It is shown that the calculation result by this method is simple in operation process and has high accuracy.It is easy for users to manage with any well-informed space finite element analysis software.