| 弹塑性结构动力系统的时变刚度激励效应分析 |
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| 引用本文： | 黄庆丰,王全凤.弹塑性结构动力系统的时变刚度激励效应分析[J].土木工程学报,2006,39(12):18-22. |
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| 作者姓名： | 黄庆丰 王全凤 |
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| 作者单位： | 华侨大学,福建泉州,362011 |
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| 基金项目： | 国家自然科学基金;华侨大学科研资助项目 |
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| 摘 要： | 从理论上探讨弹塑性结构动力系统局部屈服卸载作用的力学机理,并提出其计算方法。引用运动模态空间分析指出:弹塑性结构动力系统运动中存在一个与时变刚度激励相对应的科氏加速度分量,其激励效应即为弹塑性结构动力系统的屈服卸载效应;基于计算时间步长内结构动力系统刚度定常化的时程分析方法,文中建立一个动态的补充能量方程,描述弹塑性结构动力系统在各个计算步内因系统割线刚度矩阵变化引起的系统能量分布变化,从而导出弹塑性结构动力系统的时变刚度激励效应计算方法和公式。该方法计算简单,计算过程的物理意义清楚,计算稳定性和可靠性好。
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| 关 键 词： | 时变刚度 运动模态空间 科氏加速度 屈服卸载 能量方程 |
| 文章编号： | 1000-131X(2006)12-0018-06 |
| 修稿时间： | 2006年1月13日 |
Analysis of time-variant stiffness excitation effects of elastoplastic dynamic structural systems |
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| Huang Qingfeng,Wang Quanfeng.Analysis of time-variant stiffness excitation effects of elastoplastic dynamic structural systems[J].China Civil Engineering Journal,2006,39(12):18-22. |
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| Authors: | Huang Qingfeng Wang Quanfeng |
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| Abstract: | The mechanism of yield-unloading excitation for elastoplastic dynamic structure systems is analyzed,and a method is presented to calculate the excitation effects.A study on the moving modal space indicates that there exists a Coriolis acceleration division in the motion of an elastoplastic dynamics structural system that correlates to the time-variant stiffness excitation leading to the yield unloading effect.Based on a time-dependent integral analysis in which the dynamic system stiffness is stationary in time,a supplementary energy equation is established to describe the changes in energy distribution caused by the changes of the secant stiffness vector.In the paper,a computational procedure for the time-variant stiffness excitation effect is proposed. |
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| Keywords: | time-variant stiffness movement modal space Coriolis acceleration yield unload supplementary energy equation |
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