荷载非对称分布对组合肋壳稳定性的影响

首先对组合肋壳与其他组合壳体结构形式进行了对比,阐述了组合肋壳这种新型结构的优势.利用非线性有限单元法研究了荷载非对称分布对组合肋壳稳定性的影响,得出了在U.L.描述下的组合单元刚度矩阵,并利用弧长法跟踪结构的荷载-位移曲线.通过在全跨、1/2跨对称、1/2跨不对称、1/4跨四种不同荷载分布作用下,组合肋壳稳定性的全过程跟踪,得到了组合肋壳的失稳形式和最大变形点全过程荷载-位移曲线,发现不同荷载作用下极限荷载不同,1/4跨均布荷载是结构的最不利受力情况,同时计算结果显示组合肋壳结构有较高的后屈曲强度.

Effect of disymmetrical loading on the stability of composite ribbed shell

A comparison between ribbed shell and other shell structures is made and the advantage of ribbed shell is expatiated. Based on the nonlinear finite theory, the combined element stiffness matrix is derived,and the effect of dissymmetrical loading on the stability of composite ribbed shell is studied. Arc-length is used to find the curve of loading and displacement. After tracking the stability of composite ribbed shell under 4 different loading, including full span loading, 12 span unsymmetrical loading, 12 span symmetrical loading, 14 span loading, the loading and displacement curve of every loading condition is obtained.The paper concluded that the buckling mode and ultimate bearing capacity is varificed under different loading,among which 14 loading is the worst condition. It is obvious that ribbed shell has higher post-bulking ability.