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抗震能力曲线弹塑性双折线模型的确定方法*
刘文锋1,2,王金婷1,唐剑维1
摘 要

1 青岛理工大学, 青岛 266033 2 蓝色经济区工程建设与安全协调创新中心, 青岛 266033

 

[摘要]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(075Vu)法、通用屈服弯矩法和修正ATC40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(075Vu)法和通用屈服弯矩法与抛物线法相似度高;修正ATC40法计算的屈服位移明显偏小。

[关键词]抗震能力; 双折线模型; 抛物线法; 抗震性能参数统计

中图分类号:TU375.4    文献标识码:A    文章编号:1002-848X(2015)04-0014-04

 

Determining method of elastoplastic double broken line model for seismic capacity curve

Liu Wenfeng1,2, Wang Jinting1, Tang Jianwei1

 (1 Qingdao Technological University, Qingdao 266033, China  2 Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, China)

 

Abstract:Elastoplastic double broken line model for seismic capacity curve plays an important role in evaluating the seismic performance of structure reasonably. The parabolic method was proposed. Taking the seismic capacity curves of 18 frame structures for example, the elastoplastic double broken line models were determined and the similarity analyses were carried out by using the parabolic method, modified secant (075Vu) method, universal yield moment method and modified ATC40 method. The statistical regularities of top yield drift angle, ductility ratio and the ratio of second and first stiffness of the double broken line model were researched. The research results show that the parabolic method can reflect intrinsic mechanical characteristics of the yield point of double broken line model for seismic capacity curve, and has high similarities with actual seismic capacity curve. The modified secant (075Vu) method and universal yield moment method have high similarities with actual seismic capacity curve of parabolic method. The yield displacement of ATC40 method is obviously smaller than those of  others.

Keywords:seismic capacity; double broken line model; parabolic method;  seismic capacity parameter statistics

 

*国家自然科学基金项目(50878110)

作者简介:刘文锋,博士,教授,Emaillwf6688@sohu.com

 

参考文献

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