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(華建集團(tuán)華東建筑設(shè)計(jì)研究總院， 上海 200011)

［摘要］某異型多塔連體高層結(jié)構(gòu)，采用帶懸挑體的鋼結(jié)構(gòu)支撐筒連體結(jié)構(gòu)，由三個(gè)鋼結(jié)構(gòu)支撐筒體及懸挑（連體）部分組成，三個(gè)鋼結(jié)構(gòu)支撐筒體在不同高度兩兩剛性相連，且存在多處大跨度懸挑，結(jié)構(gòu)落地面積小。針對(duì)這類結(jié)構(gòu)的抗震性能、穩(wěn)定極限承載力，開展專項(xiàng)研究。選擇7組地震波，進(jìn)行7度罕遇地震下的動(dòng)力彈塑性分析和性能評(píng)價(jià)；在此基礎(chǔ)上，增大地震作用水平至8度、9度罕遇地震，進(jìn)行結(jié)構(gòu)的抗震性能驗(yàn)證，并與7度罕遇地震下分析結(jié)果進(jìn)行比較，考察結(jié)構(gòu)整體承載力與剛度退化的過程。同時(shí)采用靜力非線性分析的方法，在考慮幾何非線性和材料非線性的基礎(chǔ)上，對(duì)結(jié)構(gòu)進(jìn)行水平荷載作用下的極限承載力分析。結(jié)果表明：地震作用下結(jié)構(gòu)破壞順序符合設(shè)計(jì)預(yù)期，具有抵御9度罕遇地震的能力。

［關(guān)鍵詞］多塔連體結(jié)構(gòu)；  大懸挑體； 巨震； 抗震性能； 極限承載力

中圖分類號(hào)：TU375-4文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)13-0101-05

Study on seismic performance under very rare earthquake and ultimate bearing capacity of a special-shaped multi-tower-connected high-rise building

TONG Jun

(ARCPLUS Group East China Architectural Design & Research Institute, Shanghai 200011, China)

Abstract:A special-shaped multi-tower-connected high-rise structure adopts steel structure support cylinder connected structure with cantilevered body, which is composed of three steel structure supported cylinders and cantilevered（connections) parts. The three steel structure support cylinders are rigidly connected two by two in pairs at different heights, with multiple large-span cantilevered bodies and relatively small bottom support area. Special research was conducted on the seismic performance and the ultimate bearing capacity of such structures. Seven groups of seismic waves were selected to conduct elastic-plastic time-history analysis and performance evaluation under 7-degree rare earthquakes; on this basis, the earthquake action level to 8-degree and 9-degree rare earthquakes were increased to verify the seismic performance of the structure, the analysis results were compared under  7-degree rare earthquake, and the overall bearing capacity and stiffness degradation process of the structure were investigated. At the same time, on the basis of considering geometric nonlinearity and material nonlinearity, the  ultimate bearing capacity analysis of the structure under  horizontal load were carried out by the method of Pushover analysis. The results show that  the failure sequence under the earthquake action is in accordance with the design expectations, and the structure has the ability to withstand 9-degree rare earthquakes. 

Keywords:multi-tower-connected structure；   large-span cantilevered body； very rare earthquake； seismic performance； ultimate bearing capacity

*上海超高層建筑設(shè)計(jì)工程技術(shù)研究中心”建設(shè)項(xiàng)目（14D22252800）。

作者簡介：童駿，碩士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：tj@ecadi.com。