工程结构中非线性动态失稳与分叉理论

• 机 构: Department of Road and Traffic Engineering, Tongji University, Shanghai 200092, P.R. ChinaDepartment
• 出 处: 上海大学学报（英文版）
• 发表日期: 2005年1期
• 关键词: nonlinear dynamic instability engineering structures non-stationary nonlinear sy

In civil engineering, the nonlinear dynamic instability of structures occurs at a bifurcation point or a limit point. The instability at a bifurcation point can be analyzed with the theory of nonlinear dynamics, and that at a limit point can be discussed with the theory of elastoplasticity. In this paper, the nonlinear dynamic instability of structures was treated with mathematical and mechanical theories.The research methods for the problems of structural nonlinear dynamic stability were discussed first, and then the criterion of stability or instability of structures, the method to obtain the bifurcation point and the limit point, and the formulae of the directions of the branch solutions at a bifurcation point were elucidated. These methods can be applied to the problems of nonlinear dynamic instability of structures such as reticulated shells, space grid structures, and so on.