摘要
对称弯压拱存在分支屈曲与极值点失稳2种面内失稳形式.根据在失稳前后拱轴线变形形状的不同,提出了对称弯压拱失稳类型的变形判断方法,它可用拱轴线变形增量来判断,也可以通过关键截面的荷载-位移曲线来判断.将这种变形判断法应用于有限元分析中,对2个实例的计算表明,该判断方法正确、有效.
In - plane buckling of symmetrical press - bending arches our be subdivided into two types： bifurcation- buckling and limit - point buckling. Based on the difference of arch axis deformation shape between pre - buckling and post - buckling, the deformed - status distinguish method is presented for in - plane buckling of symmetrical press - bending arches. It can be described by deformation increment of arch rib or by loads - deform curve of characteristic sections. This method is used into FE analysis. The calculating results of two sample arches demonstrate that the proposed method is accurate and effective.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第2期267-271,276,共6页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省教育厅科研资助项目(JA07014)
关键词
拱
稳定
面内
非线性
变形
有限元
arch
buckling
in - plane
nonlinear
deformation
finite element method
