李青宁
    (西安建筑科技大学建工系 710055)

[提要]  导出了矩形、箱形、圆形和环形变截面杆元的传递矩阵、刚度矩阵和几种常见荷载下的固端力，均为精确解析式，可直接应用于工程结构的受力分析，或补充到现有计算程序的单元库中。
[关键词]  变截面 杆元 传递矩阵 刚度矩阵  固端力

The transfer matrices and stiffness matrices of bar elements with variable cross-section are derived, which include rectangular, box, circular and annular cross-section bars. The fixed-end forces of bar elements in some kinds of common load action are derived also. These matrices and forces are all accurate analytic formulas, which can be used in structural analysis directly, and can be supplied into available computer programs elements storage.
Keywords: variable cross-section; bar element; transfer matrix; stiffness matrix; fixed-end forces