施工過程對結(jié)構(gòu)抗震性能影響分析*
劉 沛1，董佩偉2 ，趙 昕1
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(1 同濟(jì)大學(xué)建筑設(shè)計研究(集團(tuán))有限公司，上海200092；2 同濟(jì)大學(xué)建筑工程系，上海200092)[摘要] 結(jié)構(gòu)初始狀態(tài)會影響其在大震下的彈塑性反應(yīng)。而施工過程會影響結(jié)構(gòu)的初始狀態(tài)，從而影響結(jié)構(gòu)彈塑性反應(yīng)。結(jié)構(gòu)設(shè)計和抗震分析應(yīng)基于考慮結(jié)構(gòu)施工過程的實際狀態(tài)。但現(xiàn)有的結(jié)構(gòu)分析方法很難將抗震分析與施工模擬結(jié)合起來。本文采用虛擬荷載法模擬施工過程，從而使得動力彈塑性分析可以在考慮施工過程的結(jié)構(gòu)上實現(xiàn)。本文以兩層框架為例，采用虛擬荷載法求得較為理想的施工模擬等效荷載。采用El Centro NS 地震波對結(jié)構(gòu)進(jìn)行動力彈塑性分析，對比了考慮和不考慮施工過程的結(jié)構(gòu)在該地震波下的彈塑性表現(xiàn)。結(jié)果表明，施工過程影響大震下的結(jié)構(gòu)構(gòu)件塑性發(fā)展，從而影響結(jié)構(gòu)抗震性能。[關(guān)鍵詞] 抗震性能;虛擬荷載法;施工過程中圖分類號：TU315.9 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)S1-1008-04*上海市科技攻關(guān)計劃資助（編號：09dz1207704）；上海市青年科技啟明星計劃（跟蹤）資助（編號：11QH1402700）通訊作者：董佩偉，Email:463110106@qq.com。Influence of Construction Sequence on Structural Seismic PerformanceLiu Pei 1, Dong Peiwei 2 , Zhao Xin 1(1 Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China; 2 Department of Building Engineering, Tongji University, Shanghai 200092, China)Abstract: The initial status of a structure may influence its elasto-plastic behavior under rear earthquake ground motions. Construction sequence can influence the structural initial status, thus making a discrepancy to the elasto-plastic analysis. Structural design and seismic analysis should be based on the actual structural status considering construction sequence. But it is hard to combine seismic analysis and construction sequence simulation using current structural analysis method. A virtual load method was used in this paper to simulate construction sequence, on the understanding of which the nonlinear dynamic analysis can be performed on actual structure considering construction sequence. A case of two-story frame structure was studied in this paper, and a good equivalent load for construction sequence simulation was obtained by virtual load method. And nonlinear dynamic analysis was performed, using El Centro NS earthquake ground motion as the seismic input. The different behaviors of the structures with and without virtual load were presented. The results have manifested that construction sequence influence the development of structural plasticity under rear earthquake ground motion, thus influencing structural seismic performance.Keywords: seismic performance, virtual load method, construction sequence
