悬挑立体桁架的平面外稳定分析

STABILITY ANALYSIS OF THE CANTILEVER TUBE-TRUSS STRUCTURE

利用ANSYS对悬挑立体桁架分别进行静力稳定分析,几何非线性分析和材料非线性分析,并研究几何缺陷对结构承载力的影响。同时考虑不同节点连接形式(刚接、半刚接、铰接)对结构极限承载力的影响。通过研究发现,几何非线性对结构承载力的影响较小,但初始缺陷的影响较大;三种节点连接形式下结构承载力差距较大,刚接形式下承载力最大,半刚接次之,铰接形式下结构承载力最小。

In this paper,the stability of the cantilever tube-truss is analyzed by using the software of ANSYS.Some factors are taken into account,such as the geometric nonlinear,material nonlinear and the initial geometric deficiencies.The influences of three different structure systems（rigid connections,semi-rigid connections and hinge type connections） for the critical bearing capacity are also considered.It is shown that the geometric nonlinear has minor influence,but the initial geometric deficiencies have overwhelmed influence.The bearing capacity of these structures with different types of connection has more divergence.These structures with the rigid connections have the largest capacity,and the capacity of these structures with the hinge type connections is the smallest.It is suggested that choosing the calculate model reasonably.