薄壁截面梁轴向位移协调性的研究

Study on Compatibility of Axial Displacement of Thin-Walled Cross Section Beam

当2种不同截面的薄壁梁连接在一起时,接头两侧截面的轴向位移一般不协调,目前有2种方案来实现在积分意义下的协调,从而得到2种不同的接头连接条件。研究表明,有1种方案不满足互换性,结果明显不合理。证明了薄壁梁单元之间轴向位移完全协调的2个充分条件。

The incompatibility of axial displacements occurs at the joint of two thin-walled beams with different cross sections.Currently there are two approaches to be used to realize the compatibility in the sense of integration,and two joint connecting conditions are thus ob- tained.The result of the authors' study,however,shows that one of the approaches cannot satisfy the interconvertibility and may cause the result unreasonable.In addition,two new sufficient conditions which can assure the compatibility are proposed.