文章详细信息 关键词： 稳定;;等效力法;;框架;;变轴力;;负刚度 [gap=931]Keywords: stability;equivalent force method;frame;varying axial force;negative stiffness
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A method is used to solve the problem of morbid matrix caused by negative stiffness.
当单元的应力、应变点位于本构关系曲线下降段时，采用人为加大刚度的办法，解决了负刚度带来的病态矩阵问题。
参考来源 - 高强混凝土框架节点的非线性有限元分析The process of negative stillness is an important and special process of structure analysis. In consideration of the above reasons, story restoring-force model with negative stillness is selected as the computational model.
负刚度阶段是结构受力一变形分析的一个特殊阶段，也是重要的阶段，为了更合理的反映结构的恢复力特性，得到结构能力曲线的下降段(负刚度阶段)，本文研究了带有下降段的考虑刚度退化四线型层恢复力模型的确定方法和过程。
参考来源 - 钢筋混凝土结构考虑负刚度的随机层恢复力模型的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
在负刚度条件下，该法是收敛的和条件稳定的。
In the case of negative stiffness, the method is convergent and conditionally stable.
针对软化结构的负刚度问题，提出了一种多维虚加弹簧法。
The multi-assumed-spring method is developed to solve the negative stiffness problem of softening structures.
本文研究了极限后负刚度段对钢筋混凝土框架结构地震倒塌反应的影响。
In this paper, the influence of post-ultimate negative stiffness stage on earthquake collapse response of reinforced concrete frame structures to a severe earthquake is studied.
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