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多自由度体系的等价线性化方法是预测结构的非线性地震峰值响应的有效方法。单自由度等价线性化模型是该方法的基础。该文在前人研究的基础上,从定性和定量的两个方面综合分析了结构周期、延性系数以及恢复力模型等因素对单自由度等价线性化模型的影响,并通过对大量地震动记录下动力弹塑性分析结果的拟合回归,提出了能够综合反映各方面参数影响的单自由度等价线性化模型。与现有代表性的等价线性化模型相比,该文模型所反映的参数最为全面,预测峰值位移的平均相对误差最小,且略偏于保守。
The equivalent linearization method of multi-degree-of-freedom system is an effective method to predict the nonlinear seismic peak response of structures. The single degree of freedom equivalent linearization model is the basis of this method. Based on the previous researches, this paper comprehensively analyzes the influence of structural period, ductility coefficient and restoring force model on the single-degree-of-freedom equivalent linearization model from qualitative and quantitative aspects. The fitting regression of the results of dynamic elasto-plastic analysis was recorded, and a single-degree-of-freedom equivalent linearization model that can comprehensively reflect the influence of various parameters was proposed. Compared with the existing representative equivalent linearization model, the model reflects the most comprehensive parameters, and the average relative error of the predicted peak displacements is the smallest, and slightly conservative.