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（1 青島理工大學(xué)， 青島 266033； 2 藍色經(jīng)濟區(qū)工程建設(shè)與安全協(xié)調(diào)創(chuàng)新中心， 青島 266033）

［摘要］抗震能力曲線彈塑性雙折線模型對合理評估結(jié)構(gòu)抗震性能具有重要作用。提出了拋物線法，以18個框架結(jié)構(gòu)抗震能力曲線為例，運用拋物線法、修正割線(075Vu)法、通用屈服彎矩法和修正ATC40法確定彈塑性雙折線模型并進行相似性分析；研究頂點屈服位移角、延性比和雙折線模型第二與第一剛度比的統(tǒng)計規(guī)律。研究表明，拋物線法是一種能反映抗震能力曲線彈塑性雙折線模型屈服點本質(zhì)力學(xué)特征的方法，與原抗震能力曲線相似度高；修正割線(075Vu)法和通用屈服彎矩法與拋物線法相似度高；修正ATC40法計算的屈服位移明顯偏小。

［關(guān)鍵詞］抗震能力； 雙折線模型； 拋物線法； 抗震性能參數(shù)統(tǒng)計

中圖分類號：TU375.4    文獻標(biāo)識碼：A    文章編號：1002-848X(2015)04-0014-04

Determining method of elastoplastic 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:Elastoplastic 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 elastoplastic double broken line models were determined and the similarity analyses were carried out by using the parabolic method, modified secant (075Vu) method, universal yield moment method and modified ATC40 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 (075Vu) method and universal yield moment method have high similarities with actual seismic capacity curve of parabolic method. The yield displacement of ATC40 method is obviously smaller than those of  others.

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

*國家自然科學(xué)基金項目(50878110)。

作者簡介：劉文鋒，博士，教授，Email：lwf6688@sohu.com。

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