Correlation failure analysis of an uncertain hysteretic vibration system

In this paper, a numerical method for correlation sensitivity analysis of a nonlinear random vibration system is presented. Based on the first passage failure model, the probability perturbation method is employed to determine the statistical characteristics of failure modes and the correlation between them. The sensitivity of correlation between failure modes with respect to random parameters characterizing the uncertainty of the hysteretic loop is discussed. In a numerical example, a two-DOF shear structure with uncertain hysteretic restoring force is considered. The statistical characteristics of response, failure modes and the sensitivity of random hysteretic loop parameters are provided, and also compared with a Monte Carlo simulation.

基于IDARC的RC剪力墙Park恢复力模型参数修正

使用IDARC非线性分析程序对RC剪力墙构件进行拟静力反复加载非线性分析,研究Park恢复力模型4个参数对剪力墙构件强度、刚度、卸载刚度、耗能和等效粘滞阻尼的影响规律及影响程度。将修正后的参数运用于剪力墙低周往复荷载试验的数值模拟,得到的结果与试验结果较为吻合,并根据得到的数据提出了针对RC剪力墙构件的Park恢复力模型参数建议取值范围。研究结果表明:刚度退化参数α对剪力墙构件的卸载刚度、耗能及等效粘滞阻尼有较大影响;基于延性的强度退化参数β1对构件的强度影响较大,对耗能及等效粘滞阻尼有中度影响;基于能量的强度退化参数β2对构件的各项抗震指标均有轻微影响;滑移退化参数γ对构件的耗能及等效粘滞阻尼有较大影响。

基于Park-Ang模型的框架结构地震损伤性能评估

借鉴Pushover分析和混凝土构件损伤评估的基本思想对结构进行性能评估。通过能力谱方法,得出罕遇地震作用下结构的层间位移,采用Park-Ang模型计算结构各层的损伤指标,并结合非线性静力分析的结构构件塑性铰的发展、分布情况对结构的性能水平进行评估。本文方法利用结构滞回耗能与结构最大位移的关系求解结构的滞回耗能,极大地提高了计算效率,具有广阔的工程应用前景。