胡进军1,2?覮,刘巴黎1,2.基于不同归一化参数的单自由度体系 残余位移比离散性研究[J].湖南大学学报:自然科学版,2021,(7):71~78
基于不同归一化参数的单自由度体系 残余位移比离散性研究
Study on Variability of Residual Displacement Ratios Based on Different Normalized Parameters for SDOF Systems
  
DOI:
中文关键词:  残余位移  归一化参数  相关性  离散性  结构弹塑性特征参数
英文关键词:residual displacement  normalized parameter  correlation  dispersion  elastic-plastic characteristic parameter of structure
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作者单位
胡进军1,2?覮,刘巴黎1,2 (1. 中国地震局 工程力学研究所黑龙江 哈尔滨 150080 2. 中国地震局 地震工程与工程振动重点实验室黑龙江 哈尔滨 150080) 
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中文摘要:
      结构弹塑性特征的差异会引起残余位移较大的离散性,使得强震下结构残余位移难以准确预测. 为准确评估和预测震后结构残余位移,实现精细化的抗震设计和评估,有必要研究结构残余位移的离散性. 鉴于此,基于大量分类地震动记录,选用不同的归一化参数分别定义残余位移比,通过非线性时程分析建立单自由度体系残余位移比谱,研究弹塑性特征参数(延性系数和强度折减系数)以及场地条件对残余位移比离散性的影响,建立了残余位移比变异系数谱的拟合公式. 结果表明:残余位移与弹塑性谱位移的相关性比与弹性谱位移更好;结构残余位移比离散性受场地类别的影响较小;残余位移比变异系数谱分别随延性系数和强度折减系数的增大而增大;选择弹塑性谱位移作为归一化参数可以减小结构残余位移比离散性.
英文摘要:
      The elastic-plastic characteristics of the structure will lead to large dispersion of the residual displacements,which makes it difficult to predict the residual displacements accurately under strong earthquake excitations. In order to accurately evaluate and predict the residual displacements of the structure and realize the refined aseismic design,it is necessary to investigate the dispersion of the residual displacement of structures. In the light of this,based on a large number of classified ground motions,different normalized parameters are used to define the residual displacement ratio in this paper. The residual displacement ratios spectra of single degree of freedom(SDOF) systems are constructed by means of nonlinear response time-history analyses. The results are statistically organized to evaluate the influence of the following parameters: elastic-plastic characteristic parameters(ductility factor and strength reduction factor) and site condition. A simplified expression is presented to estimate the variation coefficient spectra of residual displacement ratios. It is concluded that the correlation between residual displacements and inelastic spectral displacements is better than that between residual displacements and elastic spectral displacements. The dispersion of the residual displacements is less affected by the site conditions. The variation coefficient spectra of residual displacement ratios increase with the increase of elastic-plastic characteristic parameters. It is suggested to select the inelastic spectral displacement as the normalized parameter,which can reduce the dispersion of the residual displacement ratios.
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