中文摘要：

采用正交分解方法,可完备地将平面有限元综合变形分析结果分解为三个基本刚体位移和五个基本弹性变形（包括竖向弯曲变形）,并可将其中的竖向弯曲变形分量用于钢构件稳定性分析和实时监控。通过与现有方法进行对比分析,证实了该方法的有效性以及工程可行性。

英文摘要：

The orthogonal decomposition method was used to analyze integrated deformations of plane finite element.The integrated deformations could be completely decomposed into three basic rigid body displacements and five basic elastic deformations.The vertical flexural deformation is one of basic elastic deformations.And the vertical flexural deformation component could be directly applied to the stability analysis and real-time monitoring of the steel members.Compared with existing analysis methods,the validity and engineering practicability of the method were confirmed.