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抗震能力曲线弹塑性双折线模型对合理评估结构抗震性能具有重要作用。提出了抛物线法,以18个框架结构抗震能力曲线为例,运用抛物线法、修正割线(0.75Vu)法、通用屈服弯矩法和修正ATC-40法确定弹塑性双折线模型并进行相似性分析;研究顶点屈服位移角、延性比和双折线模型第二与第一刚度比的统计规律。研究表明,抛物线法是一种能反映抗震能力曲线弹塑性双折线模型屈服点本质力学特征的方法,与原抗震能力曲线相似度高;修正割线(0.75Vu)法和通用屈服弯矩法与抛物线法相似度高;修正ATC-40法计算的屈服位移明显偏小。
Seismic Capacity Curve Elastic-plastic double-break line model plays an important role in the reasonable assessment of seismic performance of structures. A parabola method is proposed. Taking the seismic capacity curve of 18 frame structures as an example, the parabola method, the modified secant (0.75Vu) method, the general yield moment method and the modified ATC-40 method are used to determine the elasto-plastic double- Analysis; the study of the vertex yield displacement angle, ductility ratio and the second double-line model of the second and first stiffness ratio of the statistical law. The results show that the parabola method is a method that can reflect the intrinsic mechanical characteristics of the yield point of the elasto-plastic double-break curve model of seismic capacity curve and has high similarity with the original seismic capacity curve. The modified secant (0.75Vu) method and the general yield moment method Parabolic similarity is high; the yield displacement corrected by ATC-40 method is obviously smaller.