摘要
为研究超长桩在横向动力荷载作用下的失稳破坏过程,应用突变理论建立了超长桩横向动力稳定性的双尖点突变模型,对超长桩在横向简谐荷载作用下稳定的机理进行了研究。在模型所给出的两个尖点坐标基础上,分析了非线性系数μ和频率比η这两个参数对超长桩振幅的影响。结果表明,当非线性系数在两个尖点之间时,频率比η在一定范围的连续变化会引起振幅的突然变化,即产生跳跃现象,这是导致超长桩发生横向失稳破坏的一种机制。
To investigate the instability of super-long pile under lateral dynamic load,the double cusps catastrophe model to analysis the dynamic stability of super-long pile is established by catastrophe theory.The mechanism of stability of super-long pile under lateral simple harmonic load is analyzed and the coordinates of two cusps is derived.The effects of nonlinear coefficient μ and frequency ratio η on amplitude of super-long pile are analyzed.The analysis of the parameters shows that： when nonlinear coefficient between two cusps,continuous change of η can arise abrupt change of amplitude,that is,produce jumping,which is the mechanism of lateral instability of super-long pile.
出处
《水运工程》
北大核心
2011年第8期9-13,共5页
Port & Waterway Engineering
关键词
超长桩
横向动力荷载
突变理论
动力失稳
稳定性分析
super-long pile
lateral dynamic load
catastrophe theory
dynamic instability
stability analysis
