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本帖最后由 shogo 于 2016-3-3 09:25 编辑
不能叠加是不是因为截面的坐标系是不断变化,因此转角需要转换后才能叠加,而不能采用小变形假设中的线性叠加。
关于刚度矩阵的修正建议看一下以下几篇文章
Yang Y B, McGuire W. Joint rotation and geometric nonlinear analysis, Journal of Structural Engineering, ASCE, 1986, 112(4):879-905.
Conci A, Gattass M. Natural approach for geometric nonlinear analysis of thin-walled frames, International Journal for Numerical Methods in Engineering, 1990, 30(2):207-231.
Argyris J.H., Dunne P.C., Malejannakis G.A. and Scharpf D.W., On Large Displacement-Small Strain Analysis of Structures with Rotational Degrees of Freedom, Computer Methods in Applied Mechanics and Engineering, vol. 14, 1978, pp. 401-451 and vol. 15, 1978, pp. 99-135.
Chen H, Blandford G E. Thin-walled space frames.Ⅰ: large-deformation analysis theory, Journal of Structural Engineering, ASCE, 1991, 117(8):2499-2520. |
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