中文摘要：

基于变形分析理论，提出了适用于空间杆系结构的两节点二十二自由度梁单元分析模型．该模型考虑了拉压、弯、剪、扭等多因素耦合作用．为提高模型精度，放弃了轴向等应变假定，引入剪切位移，并对塑性阶段的平截面假定进行了修正．在上述空间梁单元模型研究基础上编制了非线性程序，并以一三维框架为例验证了模型的有效性和精确性．

英文摘要：

The paper presents a degrees of freedom. Based on th pull, press, bend, the assumption of shear, and constant introduced. The plane cross-s the plastic stage. Using the p three-dimensional framework efcient and accurate. new spatial beam e deformation anal element model of two nodes with twenty-two ysis, the coupled effects of multifactor, such as torsion are considered. To improve the accuracy of the new model, longitudinal strain is abandoned and the shear displacement is ection assumption of beam is also modified when the material is at roposed model, the nonlinear analytical program is developed and a is analyzed. The numerical results show the developed model is