杆件屈曲对单层球面网壳结构稳定性的影响

Member buckling of the effect on the stability of the single-layer lattice dome structures

为研究杆件屈曲对单层球面网壳结构整体稳定性的影响,采用非线性有限单元法,在考虑节点缺陷和杆件缺陷的基础上,通过削减K8型单层球面网壳结构一径向不同位置处的杆件截面使其在网壳结构发生整体失稳之前屈曲,分别在静力载荷和地震载荷作用下,研究不同位置处的杆件屈曲对K8型单层球面网壳结构整体稳定性的影响.研究结果表明:在静力载荷作用下,不同位置处的杆件屈曲会不同程度的降低网壳结构极限承载力;在地震载荷作用下,单根杆件结构的首先屈曲会使网壳结构刚度降低.

In order to study the member buckling of the effect on the stability of single-layer lattice dome structures, this paper used the nonlinear finite element method, and besides the node imperfection and member imperfection, utilized the smaller cross section members in different location of the structure in order to make those members buckle before the occurrence of the overall instability of the dome; the effect on the overall stability of K8 single-layer lattice dome structures from the member buckling at different location were studied under static load and earthquake load respectively. The research results show that under the static load, different location of the member buckling may reduce K8 single-layer lattice dome structures ultimate bearing capacity; Under earthquake load, the member before K8 single-layer lattice dome structures overall instability before buckling may reduce K8 single-layer lattice dome structures stiffness.