CCTV新台址主楼抗震性能研究
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摘要
中央电视台新台址主楼建筑造型和结构体系独特,结构动力特性和地震响应异常复杂。本文首先研究了结构的自振特性,研究结果表明,其1、2阶振型表现为沿两塔楼对角线方向的平动变形,并伴随塔身扭转变形以及大悬臂竖向振动,其3、5、7阶振型以扭转为主。在自振特性分析的基础上,应用有限元数值方法对结构的小震、中震弹性响应进行了分析。通过对构件承载性能的分析建立了弹塑性计算模型,并应用此模型进行了结构大震弹塑性时程响应和静力弹塑性推覆分析,依据抗震性能指标校核了结构及构件的承载力。基于FNA进行的大震弹塑性时程分析表明,最大层间位移角满足1/50的限值条件。推覆分析分别采用以加速度相关和质量相关的横向力分布模式,正、反向加载进行计算,按照目标位移法和能力谱法确定结构的地震响应以及推覆过程中塑性铰的分布状态。基于三套地震作用参数(《建筑抗震设计规范》(GB50011—2001),100年使用年限换算设防烈度及地震安评报告)的计算结果,综合评估了结构的地震响应及承载性能。弹性与弹塑性抗震分析结果表明,CCTV主楼能够满足《建筑抗震设计规范》提出的各项抗震设防要求和既定的各项抗震性能指标,具有可靠的抗震承载能力。
The peculiar building style and special structural system of the New CCTV Building induce complicated dynamic attributes and intricate earthquake response to the structure.The primary purpose of this paper is to present the response of the New CCTV Building due to earthquake and to check out its aseismic load-carrying capability.The free vibration attribute was studied at first,and it was found that the first and secondary vibration mode were horizontal movements of the global structure in the direction of 45° or 135°,associated with the significant rotation of the towers and the vertical movement of the cantilevered structure.Then the elastic finite element method was employed to study the structure response stimulated by frequent and moderate earthquake.Through the investigation of load-carrying performance of main frame members,the elasto-plastic model of the structure was established.And with this model,time-history analysis in rare earthquake and push-over analysis was conducted.Apart from that,the status of all frame elements in chief structure system was checked out according to the aseismic performance index.The studies in this paper not only revealed the distinct dynamic attribute and aseismic load-carrying capability of the building,but also demonstrated the earthquake response of the building in earthquake of different intensities.All elastic and elastic-plastic analytical results come to a conclusion that the New CCTV Building meets the aseismic design requirement of Chinese code and the aseismic performance index specified in the study.The information and conclusion derived in this study is useful and significant in validating and improving the aseismic design of the New CCTV Building.
The peculiar building style and special structural system of the New CCTV Building induce complicated dynamic attributes and intricate earthquake response to the structure.The primary purpose of this paper is to present the response of the New CCTV Building due to earthquake and to check out its aseismic load-carrying capability.The free vibration attribute was studied at first,and it was found that the first and secondary vibration mode were horizontal movements of the global structure in the direction of 45° or 135°,associated with the significant rotation of the towers and the vertical movement of the cantilevered structure.Then the elastic finite element method was employed to study the structure response stimulated by frequent and moderate earthquake.Through the investigation of load-carrying performance of main frame members,the elasto-plastic model of the structure was established.And with this model,time-history analysis in rare earthquake and push-over analysis was conducted.Apart from that,the status of all frame elements in chief structure system was checked out according to the aseismic performance index.The studies in this paper not only revealed the distinct dynamic attribute and aseismic load-carrying capability of the building,but also demonstrated the earthquake response of the building in earthquake of different intensities.All elastic and elastic-plastic analytical results come to a conclusion that the New CCTV Building meets the aseismic design requirement of Chinese code and the aseismic performance index specified in the study.The information and conclusion derived in this study is useful and significant in validating and improving the aseismic design of the New CCTV Building.
引文
[1]奥雅纳工程顾问有限公司.中央电视台新台址建筑结构超限设计可行性报告ISSUE 1[R].香港:奥雅纳工程顾问有限公司,2003.10(Ove Arup&Partners HongKong Ltd.Feasibility report for exceeding limits of the NewCCTV Building:ISSUE 1[R].Hong kong:Ove Arup&Partners Hong Kong Ltd,October 2003.(in Chinese))
[2]北京市地震局震害防御与工程地震研究所.中央电视台新址工程场地地震安全性评定-工程应用报告[R].北京:北京市地震局震害防御与工程地震研究所,2003.5.(Institute of Aseismic and Earthquake Engineering ofBeijing Seismology Bureau.Site seismic assessment of theNew CCTV site:project application report[R].Beijing:Institute of Aseismic and Earehguake Engineering of BeijingSeismology Bureau,May 2003.(in Chinese))
[3]GB 50223—95建筑抗震设防分类标准[S].(GB50223—95 Code for aseismic defense classification ofconstructions[S].(in Chinese))
[4]GB 50011—2001建筑抗震设计规范[S].(GB50011—2001 Code for seismic design of building[S].(in Chinese))
[5]Wilson E L.Three-dimensional static and dynamic analysisof structures:A physical approach with emphasis onearthquake engineering[M].Berkeley,CA,USA:Computers and Structure Inc.,2002.
[6]Computers and Structures Inc.CSI reference manual[M].2004.
[7]GB 50009—2001建筑结构荷载规范[S].(GB50009—2001 Load code of the design of buildingconstructions[S].(in Chinese))
[8]Chopra A K.Dynamics of structures:Theory andapplications to earthquake engineering[M].Upper SaddleRiver,N.J,USA:Pearson/Prentice Hall,2001.
[9]GB 50017—2003钢结构设计规范[S].(GB 50017—2003 Code for design of steel structures[S].(inChinese))
[10]GB 50010—2001混凝土结构设计规范[S].(GB50010—2001 Code for design of concrete structures[S].(in Chinese))
[11]霍轶力.中央电视台新台址抗震性能分析[D].北京:清华大学,2006.(Huo Yili.Aseismic analyses anddeepen design of the New CCTV Building[D].Beijing:Tsinghua University,2006.(in Chinese))
[12]郭彦林,盛和太,林冰等.CCTV新台址主楼SRC柱承载力试验研究[J].建筑结构学报,2008,29(3):40-46.(GUO Yanlin,SHENG Hetai,LIN Bing,et al.Experimental investigation to SRC columns used in NewCCTV Building[J].Journal of Building Structures,2008,29(3):40-46.(in Chinese))
[13]郭彦林,霍轶力,盛和太等.中央电视台新台址主楼抗震分析系列报告[R].北京:清华大学土木工程系,2005-2006.(Guo YL,Huo YL,Sheng HT,et al.Seriesreports of aseismic analyses for the New CCTV Building[R].Beijing:Tsinghua University,2005-2006.(inChinese))
[14]郭彦林,霍轶力,盛和太.CCTV新台址主楼SRC柱抗震计算模型的建立[J].建筑结构学报,2008,29(3):54-62.(GUO Yanlin,HUO Yili,Sheng Hetai.Modeling forseismic analysis of SRC columns in New CCTV Building[J].Journal of Building Structures,2008,29(3):54-62.(in Chinese))
[15]FEMA356 Seismic rehabilitation prestandard[M].Federal Emergency Management Agency,USA,2000.
[16]中央电视台新台址建设筹备委员会,华东建筑设计研究院有限公司.中央电视台新台址主楼结构施工图[R].上海:华东建筑设计研究院有限公司,2005.(Committeeof Arrangement for the New CCTV Site,HuadongConstruction Design Corporation.Draft of the New CCTVBuilding[R].Shanghai:ECADI,2005.(in Chinese))
[17]Computers and Structure Inc.SAP2000 analysis reference[M].2004.
[18]郭彦林,盛和太,高巍等.中央电视台新台址(CCTV主楼)-SRC组合柱试验研究成果报告[R].北京:清华大学,2005.(Guo YL,Sheng HT,Gao W,et al.The NewCCTV Building:Report of experimental results of SRCcolumns[R].Beijing:Tsinghua University,2005.(inChinese))
[19]郭彦林,高巍,盛和太,林冰.中央电视台新台址(CCTV主楼)-钢结构“米”字形连接节点试验研究成果报告[R].北京:清华大学,2005.(Guo Yanlin.,Gao Wei,Sheng Hetai,et al.The New CCTV Building:Report ofexperimental results of cross joints[R].Beijing:TsinghuaUniversity,2005.(in Chinese))
[20]陈以一,王海生,赵宪忠等.高含钢率SRC压弯柱滞回性能试验研究[J].建筑结构学报,2008,29(3):31-39.(CHEN Yiyi,WANG Haisheng,ZHAO Xianzhong,et al.Experimental study on hysteretic behavior of SRC columnswith high ratio of core steel[J].Journal of BuildingStructures,2008,29(3):31-39.(in Chinese))
[21]Dowell R K,Seible F,Wilson E L.Pivot hysteresis modelfor reinforced concrete members[J].ACI StructuralJournal,1998,95(5):607-617.
[2]北京市地震局震害防御与工程地震研究所.中央电视台新址工程场地地震安全性评定-工程应用报告[R].北京:北京市地震局震害防御与工程地震研究所,2003.5.(Institute of Aseismic and Earthquake Engineering ofBeijing Seismology Bureau.Site seismic assessment of theNew CCTV site:project application report[R].Beijing:Institute of Aseismic and Earehguake Engineering of BeijingSeismology Bureau,May 2003.(in Chinese))
[3]GB 50223—95建筑抗震设防分类标准[S].(GB50223—95 Code for aseismic defense classification ofconstructions[S].(in Chinese))
[4]GB 50011—2001建筑抗震设计规范[S].(GB50011—2001 Code for seismic design of building[S].(in Chinese))
[5]Wilson E L.Three-dimensional static and dynamic analysisof structures:A physical approach with emphasis onearthquake engineering[M].Berkeley,CA,USA:Computers and Structure Inc.,2002.
[6]Computers and Structures Inc.CSI reference manual[M].2004.
[7]GB 50009—2001建筑结构荷载规范[S].(GB50009—2001 Load code of the design of buildingconstructions[S].(in Chinese))
[8]Chopra A K.Dynamics of structures:Theory andapplications to earthquake engineering[M].Upper SaddleRiver,N.J,USA:Pearson/Prentice Hall,2001.
[9]GB 50017—2003钢结构设计规范[S].(GB 50017—2003 Code for design of steel structures[S].(inChinese))
[10]GB 50010—2001混凝土结构设计规范[S].(GB50010—2001 Code for design of concrete structures[S].(in Chinese))
[11]霍轶力.中央电视台新台址抗震性能分析[D].北京:清华大学,2006.(Huo Yili.Aseismic analyses anddeepen design of the New CCTV Building[D].Beijing:Tsinghua University,2006.(in Chinese))
[12]郭彦林,盛和太,林冰等.CCTV新台址主楼SRC柱承载力试验研究[J].建筑结构学报,2008,29(3):40-46.(GUO Yanlin,SHENG Hetai,LIN Bing,et al.Experimental investigation to SRC columns used in NewCCTV Building[J].Journal of Building Structures,2008,29(3):40-46.(in Chinese))
[13]郭彦林,霍轶力,盛和太等.中央电视台新台址主楼抗震分析系列报告[R].北京:清华大学土木工程系,2005-2006.(Guo YL,Huo YL,Sheng HT,et al.Seriesreports of aseismic analyses for the New CCTV Building[R].Beijing:Tsinghua University,2005-2006.(inChinese))
[14]郭彦林,霍轶力,盛和太.CCTV新台址主楼SRC柱抗震计算模型的建立[J].建筑结构学报,2008,29(3):54-62.(GUO Yanlin,HUO Yili,Sheng Hetai.Modeling forseismic analysis of SRC columns in New CCTV Building[J].Journal of Building Structures,2008,29(3):54-62.(in Chinese))
[15]FEMA356 Seismic rehabilitation prestandard[M].Federal Emergency Management Agency,USA,2000.
[16]中央电视台新台址建设筹备委员会,华东建筑设计研究院有限公司.中央电视台新台址主楼结构施工图[R].上海:华东建筑设计研究院有限公司,2005.(Committeeof Arrangement for the New CCTV Site,HuadongConstruction Design Corporation.Draft of the New CCTVBuilding[R].Shanghai:ECADI,2005.(in Chinese))
[17]Computers and Structure Inc.SAP2000 analysis reference[M].2004.
[18]郭彦林,盛和太,高巍等.中央电视台新台址(CCTV主楼)-SRC组合柱试验研究成果报告[R].北京:清华大学,2005.(Guo YL,Sheng HT,Gao W,et al.The NewCCTV Building:Report of experimental results of SRCcolumns[R].Beijing:Tsinghua University,2005.(inChinese))
[19]郭彦林,高巍,盛和太,林冰.中央电视台新台址(CCTV主楼)-钢结构“米”字形连接节点试验研究成果报告[R].北京:清华大学,2005.(Guo Yanlin.,Gao Wei,Sheng Hetai,et al.The New CCTV Building:Report ofexperimental results of cross joints[R].Beijing:TsinghuaUniversity,2005.(in Chinese))
[20]陈以一,王海生,赵宪忠等.高含钢率SRC压弯柱滞回性能试验研究[J].建筑结构学报,2008,29(3):31-39.(CHEN Yiyi,WANG Haisheng,ZHAO Xianzhong,et al.Experimental study on hysteretic behavior of SRC columnswith high ratio of core steel[J].Journal of BuildingStructures,2008,29(3):31-39.(in Chinese))
[21]Dowell R K,Seible F,Wilson E L.Pivot hysteresis modelfor reinforced concrete members[J].ACI StructuralJournal,1998,95(5):607-617.
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