摘要
应用有限元方法对索拱结构的面内特征值屈曲及考虑几何非线性影响的非线性屈曲的平面内稳定问题进行了研究.程序中使用牛顿拉弗森法和弧长法对荷载位移平衡路线进行跟踪,研究了索对结构的极限荷载和平衡路径的影响.考虑了索与水平面夹角、索的根数及不同荷载作用方式、不同边界条件下索-拱结构稳定性能及变形性能的影响.结果表明:索可以非常有效地控制拱结构的失稳模态和破坏形式,提高其极限承载能力,影响破坏过程及后屈曲平衡路线,有效地克服了拱结构在半跨荷载作用下变形大、承载力低的缺点.
This paper analyzed the eigenvalue buckling and nonlinear buckling of cable stayed arch structure by establishing a two-dimensional finite element model. Firstly, the effects of cables on the instability behavior in the plane of hybrid structure were investigated theoretically by using the large defection （displacement） finite element approach in conjunction with the arc-length method and Newton-Raphson iteration. Then, the full loaddisplacement equilibrium paths were obtained, including the prebuckling and post-buckling equilibrium paths. The influence of the limit load-capacity and load-displacement paths, which was caused by cables, was taken into account. Furthermore, the parameters, including the angle between axis of cable and horizontal plane, the number of cable, the boundary conditions and working conditions were also considered in the theoretical investigation. It was concluded through this study that cables not only effectively controlled the buckling modes and the destructive forms but also improved the limit load-carrying capacity, and that these affected the overall failure process and the post-buckling equilibrium path. Cables could also overcome the disadvantage of big deflection and small limit load-carrying capacity of arch applied half-span loads.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第3期1-5,共5页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(10272041)
教育部跨世纪人才基金资助项目(教技函(2002)48)
关键词
屈曲
索-拱结构
非线性屈曲
极限承载力
buckling
cable-arch structure
nonlinear buckling
limit load-carrying capacity
