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（1 土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室， 清華大學(xué)土木工程系， 北京 100084； 2 北京市鋼與

混凝土組合結(jié)構(gòu)工程技術(shù)研究中心， 清華大學(xué)， 北京 100084； 3 華南理工大學(xué)土木與交通學(xué)院，

 廣州 510640； 4 華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 廣州 510640）

［摘要］在對(duì)比歐洲、美國(guó)、日本和中國(guó)規(guī)范的設(shè)防目標(biāo)和地震作用的基礎(chǔ)上，對(duì)鋼框架結(jié)構(gòu)的設(shè)計(jì)地震力、延性、側(cè)向剛度和強(qiáng)度等開(kāi)展系統(tǒng)地對(duì)比研究。結(jié)果表明，短周期結(jié)構(gòu)按歐洲、美國(guó)和中國(guó)規(guī)范計(jì)算的側(cè)向地震力分布相同，與按日本規(guī)范計(jì)算的亦十分接近；而中、長(zhǎng)周期結(jié)構(gòu)按歐洲規(guī)范計(jì)算的側(cè)向地震力小于按其他規(guī)范計(jì)算的，尤其是結(jié)構(gòu)的頂層；盡管各國(guó)規(guī)范規(guī)定的材料和構(gòu)件延性要求差別不大，美國(guó)規(guī)范針對(duì)鋼框架規(guī)定的地震力折減系數(shù)大于歐洲和日本規(guī)范的，而中國(guó)規(guī)范采用了與結(jié)構(gòu)形式無(wú)關(guān)的較保守的折減系數(shù)，導(dǎo)致按中國(guó)規(guī)范設(shè)計(jì)的鋼框架側(cè)向剛度和強(qiáng)度基本上均比歐洲和美國(guó)規(guī)范的大20%～150%，但由于日本規(guī)范采用的彈性反應(yīng)譜遠(yuǎn)大于其他規(guī)范，折減后設(shè)計(jì)地震力也更大，使得按日本規(guī)范設(shè)計(jì)的鋼框架側(cè)向剛度和強(qiáng)度比中國(guó)規(guī)范的還大；總體上，按歐洲規(guī)范設(shè)計(jì)的鋼框架側(cè)向剛度和強(qiáng)度與按美國(guó)規(guī)范設(shè)計(jì)的結(jié)果相當(dāng)。

［關(guān)鍵詞］鋼框架； 抗震設(shè)計(jì)；  承載力； 延性； 剛度

中圖分類號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)02-0007-09

Comparative study on seismic design methods for steel frames in different codes (Ⅱ): strength, ductility and drift requirement

Shi Gang1,2, Hu Fangxin3,4, Shi Yongjiu1,2

(1 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua University, Beijing 100084, China; 3 School of Civil Engineering and  Transportation, South China University of Technology, Guangzhou 510640, China; 4 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China)

Abstract:Based on the comparison of fortification target and seismic action in seismic codes of Europe, the United States, Japan and China, seismic design forces, ductility requirements, lateral stiffness and strength of steel frame structures were compared systematically. The results show that for short-period buildings, lateral seismic force distributions in Eurocode, the United States and Chinese codes are the same and very close to that in Japanese code, while for intermediate-period and long-period buildings, the United States, Japanese and Chinese codes always specify larger story shear force than Eurocode at any story, with the largest difference at the top story. Although local ductility requirements are quite similar, the United States code specifies higher reduction factors than Eurocode and Japanese code, while Chinese code stipulates a constant reduction factor with a relatively small value regardless of the ductility level of structures. As a result of such over-conservatism, steel frames designed by Chinese code exhibit 20% to 150% larger lateral stiffness and strength than Eurocode and the United States code in most cases, while the significant even larger lateral stiffness and strength predicted by Japanese code than that by Chinese code is mainly due to the larger reduced seismic design forces derived from the larger elastic response spectrum. Generally, Eurocode designed steel moment frames exhibit comparable lateral stiffness and strength with the United States code.

Keywords:steel frame; seismic design;  strength; ductility; stiffness

*國(guó)家自然科學(xué)基金項(xiàng)目（51478244），國(guó)家自然科學(xué)基金優(yōu)秀青年基金項(xiàng)目（51522806）。

作者簡(jiǎn)介：施剛，教授，博士生導(dǎo)師，Email: shigang@tsinghua.edu.cn。