- 摘 要
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夏冬平1， 張志強1,2， 李愛群2， 劉康安3
（1 東南大學土木工程學院，南京 210096； 2 東南大學混凝土及預應力混凝土結構教育部重點實驗室，南京 210096； 3 南京丹普科技工程有限公司，南京 211000）[摘要] 鹽城市金融服務中心結構由相距63. 8m的兩個高54. 2m的主塔樓和連接兩塔樓頂部的大跨度屋蓋組成，大跨屋蓋下設有兩個高空連廊。主塔樓采用鋼筋混凝土框架．剪力墻結構，大跨度屋蓋及高空連廊采用鋼桁架結構。經(jīng)計算，當主塔樓與屋蓋剛性連接時，結構頂部層間位移角超限。針對這種情況，采用了橡膠隔震墊連接主塔樓與大跨屋蓋，使結構頂部的位移得到了有效控制。該結構體形特殊，存在大跨度連體、剛度不連續(xù)等多項超限情況，結構的地震響應復雜。在多遇地震下彈性分析基礎上，采用基于纖維模型理論的PERFORM-3D軟件對整體結構進行罕遇地震作用下彈塑性時程分析，并對隔震墊的受力及變形響應進行分析。多遇地震作用下的結構彈性分析表明，結構與構件均滿足我國現(xiàn)行抗震規(guī)范要求；罕遇地震作用下彈塑性分析的計算結果表明，構件非線性損傷在合理范圍內(nèi)，滿足既定的變形性能目標；設置了隔震墊以后，整體結杓的變形得到了控制。
[關鍵詞] 大跨屋蓋；隔震；彈塑性分析；基于性能
中圖分類號：TU313 文獻標識碼：A 文章編號：1002-848X(2012) Sl-0179-07Elasto-plastic analysis of a long-span roof-isolated structure
Xia Dongping1, Zhang zhiqiang1,2, Li Aiqun2, Liu Kang' an3
(1 School of Civil Engineering, Southeast University, Nanjing 210096, China; 2 Southeast University, Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Nanjing 210096, China; 3 Nanjing DAMP Science and Technology Engineering Co., Ltd., Nanjing 211000, China)Abstract: Yancheng Financial Service Centre is composed of tw0 54.2m high towers which are 63. 8m apart and a long-span rooflinking the two towers. There are two lugh comdors under the long-span roof. Reinforced concrete frame-shear wall dual structure was selected for the two towers, and steel truss structure was selected for the corridor and the roof. According to the calculation, when the two towers and the long-span roof were rigidly connected, the drift angle of the top story would exceed the limitation of current design code. In view of tlus situation, the rubber isolator was used to connect the two towers and the roof, so that the displacement of the top of the structure was effectively controlled. The seismic behavior of the structure was complex due to that several structural indexes exceed the limitation of current design code, such as long-span connected structure and ahupt change in stiffness etc. Based on the elastic analysis under frequent earthquake action, elasto-plastic tmie history analysis under rare earthquake was carried out using PERFORM-3D. The stress and deformation responses of the isolator were also included. The structure and component can satisfy current design code according to the elastic analysis under frequent earthquake. The results of the elasto-plastic analysis under the rare earthquake indicate that the nonlinear damage of components is reasonable. It can also be concluded that the deformation of the structure is controlled after using the isolator.
Keywords: long-span roof; isolation; elasto-platic analysis; performance based
