一种精确的薄壁杆单元

An exact thin-walled beam element

构造了一种新的有 4个节点、2 2个自由度薄壁杆单元 ,其能考虑杆件的翘曲和剪切变形 ,能精确描述薄壁杆件的纯弯状态和非均匀扭转 ,而且适用于任何剖面 (开口、闭口和混合剖面 ) .数值算例表明该单元计算精度高 。

This paper presents a new exact thin walled beam element with 4 nodes and 22 degrees of freedom. The present element includes both shear and warping deformations. It can exactly model the pure bending and the non uniform torsion of beams, and is valid for any cross sections (open, closed and mixed). Numerical examples show that the proposed element is very accurate and suitable to both static and dynamic analyses of thin walled beams.