【摘要】 发展Ｖｌａｓｏｖ半无矩壳理论用于轴压棱柱形壳体弹塑性稳定性分析，其中本构关系采用形变理论．通过对双对称单闭室箱梁的分析，揭示出轴压棱柱形壳体弹塑性稳定性特征：棱柱形壳体剖面畸变不能忽略，在一定尺度范围内最小失稳载荷对应于畸变失稳；考虑塑性影响，弹性变形范围内的畸变失稳可能会转化为塑性范围的弯曲失稳．更多还原

【Abstract】 The paper extands the semi-moment theory of shells to analyze the elastic-plastic instability of prismatic shells and reveals their instability characteristics based on the computations of the elastic-plastic instability of single-cell rectangular box-beams with double symmetrical axes. It shows that neglecting the sectional distortions of prismatic shells is no longer valid due to the minimal instability load corresponding to the distortion configuration under some dimension extents and the plastic distortional instability may transfer into plastic bending instability when considering the plastic effects.更多还原