薄壁曲线梁空间等效节点荷载

本文根据断面周线不变形的薄壁曲线架翘曲扭转理论，用能量原理和力法导出了空间曲线架在八类荷载作用时的固端力计算式。它与作者导出的空间薄壁曲线架的单元刚度矩阵为应用矩阵位移法进行薄壁结构空间分析提供了必要的理论基础。在分析中，考虑了断面的剪切中心与形心不重合的影响。

EQUIVALENT SPATIAL JOINT LOADS OF CURVED THIN-WALLED STRUCTURAL MEMBER SYSTEMS

rom a general expression for strain energy,the derivation of three-dimensional curved member stiffness matrix,based on the warping torsion theory of curved thin-walled girder of non-deformable section,is presented in terms of girder geometry,The explicit formulae for the fixed-end forces due to various loadings are also described in the form of ready-to-use expressions,This enables all complex arrangements of spatially curved,thin-walled structural member systems to be analyzed by the stiffness method.All possible types of Joint displacement in spare have been considered and they are taken to be the translations and rotations in the thine direction of space plus a warping displacement at member end.The effect of eccentricity between centroid and shear centre of section are taken into aecount in the analysis Numerical examples and comparisons are presented for some typical gieder configurations,indicating the accuracy and reliability of the method.