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（1 中衡設(shè)計(jì)集團(tuán)股份有限公司， 蘇州 215021;2 江蘇省生態(tài)建筑與復(fù)雜結(jié)構(gòu)工程技術(shù)研究中心, 蘇州 215021）
［摘要］鋼結(jié)構(gòu)設(shè)計(jì)中的直接分析法在結(jié)構(gòu)力學(xué)模型中引入整體和桿件初始缺陷，在分析過程中考慮P-Δ和P-δ效應(yīng)，并以求取的內(nèi)力作為校核構(gòu)件的依據(jù)，該方法具有概念清晰等優(yōu)點(diǎn)。對比了常用設(shè)計(jì)軟件的直接分析法應(yīng)用方式，并基于SAP2000軟件提供的OAPI接口，開發(fā)了可快速施加桿件初始缺陷的插件，并通過多個案例探討了直接分析法的應(yīng)用要點(diǎn)。通過對超靜定結(jié)構(gòu)進(jìn)行彈塑性全過程分析，得到了結(jié)構(gòu)的承載力設(shè)計(jì)值與承載力極限值，獲得了結(jié)構(gòu)系統(tǒng)桿件失穩(wěn)→塑性開展→卸載的全過程響應(yīng)。同時分別采用傳統(tǒng)的一階彈性分析法與直接分析法，求取結(jié)構(gòu)達(dá)到承載力設(shè)計(jì)值時桿件內(nèi)力分布，對比了兩種方法求得內(nèi)力的差異，并分析了產(chǎn)生差異的原因。所采用的編譯方法和技術(shù)途徑可為直接分析法在SAP2000等有限元軟件中的應(yīng)用提供參考。
［關(guān)鍵詞］直接分析法； 初始缺陷； P-Δ效應(yīng)； P-δ效應(yīng)； OAPI接口； 彈塑性分析
中圖分類號：TU311-41， TU391文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)01-0036-07
Application of direct analysis method of steel structure in design software
Yang Lülei1， Wang Hui1,2， Zhang Jin1， Gong Minfeng1,2
（1 ARTS Group Co., Ltd., Suzhou 215021, China；2 Jiangsu Engineering Institute of Ecological Building & Complex Structure, Suzhou 215021, China）
Abstract:In the direct analysis method of steel structure design, integral and initial defects of members were introduced into the structural mechanics model. The P-Δ and P-δ effects were taken into account in the analysis process. The internal forces were obtained as the basis for checking components, this method had the advantages of clear concepts. The application of direct analysis method in common design software was compared. Based on the OAPI interface provided by SAP2000 software, a plug-in that could quickly apply the initial defects of members was developed. The application points of direct analysis method were discussed through several cases. Through the elastic-plastic whole process analysis of statically indeterminate structures, the design value and ultimate value of bearing capacity of structures were obtained, and the whole process response of structural system member instability→plastic development→unloading was obtained. At the same time, the traditional first-order elastic analysis method and direct analysis method were used to calculate the internal force distribution of members when the structure reached the design value of bearing capacity. The differences between the two methods were compared and the reasons for the differences were analyzed. The compiling method and technical approach adopted could provide reference for the application of direct analysis method in finite element software such as SAP2000.
Keywords:direct analysis method; initial defect; P-Δ effects; P-δ effect; OAPI interface; elasto-plastic analysis
作者簡介：楊律磊，碩士，高級工程師，Email:yanglvlei@artsgroup.cn。
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