基于概率的单自由度体系震后残余变形计算

发布时间：2018-12-22 08:39

【摘要】：准确预测结构的震后残余变形,对于结构震后性能控制及建立考虑可修复性的抗震设计方法具有重要意义。通过对不同参数的双线性单自由度(SDOF)体系分别在100条标准地震动输入下弹塑性地震反应的统计分析,研究了模型参数和地震动不确定性对SDOF体系残余变形和最大弹塑性变形的影响;建立了双线性SDOF体系震后残余变形的概率计算模型。结果表明:不同地震动输入下SDOF体系的残余变形与最大弹塑性变形之比(dR/dm)存在明显的离散性,且离散程度与结构的刚度比、自振周期、相对屈服荷载系数及峰值地面加速度相关;dR/dm的统计分布规律服从对数正态分布,基于该分布函数建立的计算模型可对给定超越概率条件和地震水平下SDOF体系的震后残余变形进行预测。通过典型算例分析认为,可以采用所建议的模型进行SDOF体系震后残余变形分析及可修复性评估。
[Abstract]:Accurate prediction of residual deformation of structures after earthquake is of great significance for structural performance control and establishment of seismic design method with repairable properties. The elastic-plastic seismic responses of bilinear single-degree-of-freedom (SDOF) systems with different parameters under 100 standard ground motion inputs are analyzed statistically. The effects of model parameters and ground motion uncertainties on residual deformation and maximum elastoplastic deformation of SDOF system are studied. The probabilistic model of residual deformation of bilinear SDOF system is established. The results show that the ratio of residual deformation to maximum elastoplastic deformation (dR/dm) of SDOF system under different ground motion input has obvious discreteness, and the degree of dispersion is related to the stiffness ratio of the structure and the natural vibration period. Correlation between relative yield load coefficient and peak ground acceleration; The statistical distribution of dR/dm follows the logarithmic normal distribution. The model based on the distribution function can be used to predict the residual deformation of SDOF system under given transcendental probability conditions and earthquake level. The analysis of typical examples shows that the proposed model can be used to analyze the residual deformation and evaluate the repairability of SDOF system after earthquake.
【作者单位】：河海大学土木与交通学院;大连理工大学建设工程学部;
【基金】：国家自然科学基金项目(51508154) 江苏省自然科学基金项目(BK20150803) 中国博士后科学基金面上项目(2015M581711)
【分类号】：TU31

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