基于塑性分析近似构建附加黏弹性阻尼器框架结构推覆曲线

基于性能的抗震设计要求使用非线性静力分析方法来评估新设计或已有消能结构的抗震性能。使用该方法对消能结构抗震性能评估的一个必要条件是要得到结构的推覆曲线。本文基于塑性理论,给出了快速、有效建立附加黏弹性阻尼器框架理想双线型推覆曲线的简化分析方法。使用该方法构建附加阻尼体系的推覆曲线无需借助结构分析软件。将3种侧向荷载模式(第1振型模式、FEMA-273模式和均布模式)作用下的简化分析结果与结构分析软件的推覆分析结果进行了比较,表明基于塑性理论的简化分析方法能够较准确地预测附加黏弹性阻尼器框架的推覆曲线,只要结构失效时能形成梁铰型侧移机构。

Approximate establishment of pushover curve for frame with supplemental viscoelastic dampers on the basis of plastic analysis

Nonlinear static procedure is used to evaluate the seismic performance of a newly designed or existing structure with passive energy dissipation systems.The pushover curve of a structure needs to be established before seismic performance evaluation.This paper presents a simplified method based on plastic analysis theory to rapidly and effectively construct the idealized bilinear pushover curve for the moment resisting frame added with viscoelastic dampers without the aid of the structural analysis program.The application of the presented method is illustrated with an example.Comparing the results determined by the proposed method using three force distribution patterns with those obtained by computer analysis,it is demonstrated that the presented simple method makes an accurate estimate of the pushover curve,provided the beam sideway mechanism develops in the primary structure.