- 摘 要
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（1 杭州鐵木辛柯建筑結(jié)構(gòu)設(shè)計事務(wù)所有限公司， 杭州 311215； 2 浙江大學(xué)土木工程系， 杭州 310058；3 北匯綠建集團有限公司， 菏澤 274000）
［摘要］通過對ETABS軟件進行二次開發(fā)，給出《鋼結(jié)構(gòu)設(shè)計標(biāo)準(zhǔn)》(GB 50017—2017)直接分析設(shè)計法在ETABS軟件中的實現(xiàn)方式。在此基礎(chǔ)上，以山東某高層住宅項目采用的隱式框架-支撐結(jié)構(gòu)體系為例，采用考慮結(jié)構(gòu)整體初始幾何缺陷和構(gòu)件初始缺陷的動力彈塑性分析方法，分析該結(jié)構(gòu)在大震作用下的動力響應(yīng)和兩種缺陷對結(jié)構(gòu)抗震性能的影響。分析結(jié)果表明：罕遇地震作用下，有無考慮缺陷和二階效應(yīng)時得到的結(jié)構(gòu)最大層間位移角均未超過1/50限值，支撐起到了第一道抗震防線的作用，框架柱保持彈性，滿足“強框架，弱支撐”的設(shè)計要求?？紤]缺陷和二階效應(yīng)會使結(jié)構(gòu)最大層間位移角有所增加，根據(jù)結(jié)構(gòu)二階效應(yīng)系數(shù)和延性系數(shù)可近似估算二階效應(yīng)對最大層間位移角的放大系數(shù)；對于高延性結(jié)構(gòu)，在進行動力彈塑性分析時，應(yīng)考慮缺陷和二階效應(yīng)對結(jié)構(gòu)抗震性能的影響。
［關(guān)鍵詞］結(jié)構(gòu)整體初始幾何缺陷； 構(gòu)件初始缺陷； 直接分析設(shè)計法； 隱式框架； 動力彈塑性分析； 二階效應(yīng)
中圖分類號：TU398-2文獻標(biāo)識碼：A文章編號：1002-848X(2020)03-0005-08
Dynamic elasto-plastic second-order effects analysis of hidden frame-brace structure by considering geometric imperfections of overall structure and member
Fu Bo1， Tong Genshu2， Hong Qi3， Wang Yanchao1
（1 TongMSK Hangzhou Steel Structure Design Co., Ltd., Hangzhou 311215, China; 2 Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; 3 Beihui Green Construction Group Co., Ltd., Heze 274000, China）
Abstract:Direct analysis method of design which is given by Standard for design of steel structure (GB 50017—2017) was implemented by the secondary development of ETABS. On this basis, the hidden frame-brace structure system of a high-rise apartment building in Shandong was taken as an example, the dynamic elasto-plastic analysis method considering initial geometric imperfections of overall structure and member initial imperfections were adopted to analyze the dynamic response of the structure under rare earthquake and the effects of the two imperfections on the seismic performance of the structure. The results show that the maximum drift ratios are not more than 1/50 limit when imperfections and second-order effects are considered or not. The brace can serve as the first seismic line of the structure and the frame columns remain elastic. The design requirement of "strong frame-weak brace" is realized. The maximum drift ratio is amplified by the existence of inperfections and second-order effects. The second-order effects coefficient and ductility coefficient of structure can be used to compute the amplification factor of the maximum drift ratio approximately. For high ductility structures, the imperfections and second-order effects should be considered in dynamic elasto-plastic analysis.
Keywords:initial geometric imperfections of overall structure; member initial imperfections; direct analysis method of design; hidden frame; dynamic elasto-plastic analysis; second-order effects
作者簡介：付波，博士，高級工程師，Email：281532216@qq.com。
