成都传媒中心大厦结构方案选型与抗震性能分析
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摘要
成都传媒中心大厦是由一组交错布置的裙房和超高层办公塔楼组成的不规则结构,外立面为三角形网格。结构利用建筑立面造型的三角形网格,形成具有良好承受水平和竖向荷载能力的空间外框筒结构体系,内部则采用框架结构体系。从结构受力特点、节点构造设计、抗震性能、施工可行性等方面对外框筒结构选型进行了综合比较分析,外框筒主结构体系采用钢结构。对内部有无核心筒进行了对比分析,计算表明可以取消内部核心筒。通过对钢结构、钢筋混凝土结构以及钢骨混凝土结构三种方案结构选型综合分析,钢结构方案结构性能最优。最后专门对钢结构方案进行了Push-over抗震性能分析,在7度罕遇地震性能点,结构构件仍处于弹性状态,无塑性铰出现,结构的最大的层间位移角发生在结构立面收进位置,且都能满足规范的变形要求。对结构进行继续加载,主要出铰位置为结构外框的角部及外框收进开洞部位,随后结构的部分梁出现塑性铰,柱无塑性铰出现,满足"强柱弱梁"。当结构的顶点位移达到结构罕遇地震时的5倍时结构最大层间位移角超过1/50,结构倒塌,因此结构从设防烈度到罕遇地震再到倒塌结构有较大的变形能力和很高的安全储备,完全能满足结构"大震不倒"。结果表明,采用外框筒-内框架钢结构方案具有良好的抗震性能。
Chengdu Media Center Building is an irregular structure,which is made up of a set of interlaced annexes and a high-rise office tower.Taking advantage of the triangle lattices in elevation,outer tube and inter frame system has good capability in bearing horizontal and vertical loads.The outer-tube adopts steel structure based on the analysis of structural performance,details of joint design,seismic behavior and construction feasibility.The inter-tube is abandoned according to analysis results.The three programs(steel structure,reinforced concrete structure and combined steel and concrete structure) are compared,and the steel structure is prefered.A Push-over analysis demonstrates that steel structure maintains elastic behavior subjected to earthquake intensity of 7 degree,and the maximum interstory drift ratio occurs at the structural elevation setback,meeting the deformation requirement in codes.With the increasing of loads,plastic hinges occur firstly at both corners and setback holes of the outer-tube,and then beam ends,meeting the strong column weak beam.Collapse occurs when the roof displacement becomes five times that of severe earthquake,resulting in maximum interstory drift ratio of structural top story exceeding 1/50.Therefore,the structure owns a high deformation capacity,totally meeting the requirement of non-collapse during severe earthquake.The result shows that the outer-tube and inter-frame structure has a good seismic behavior.
Chengdu Media Center Building is an irregular structure,which is made up of a set of interlaced annexes and a high-rise office tower.Taking advantage of the triangle lattices in elevation,outer tube and inter frame system has good capability in bearing horizontal and vertical loads.The outer-tube adopts steel structure based on the analysis of structural performance,details of joint design,seismic behavior and construction feasibility.The inter-tube is abandoned according to analysis results.The three programs(steel structure,reinforced concrete structure and combined steel and concrete structure) are compared,and the steel structure is prefered.A Push-over analysis demonstrates that steel structure maintains elastic behavior subjected to earthquake intensity of 7 degree,and the maximum interstory drift ratio occurs at the structural elevation setback,meeting the deformation requirement in codes.With the increasing of loads,plastic hinges occur firstly at both corners and setback holes of the outer-tube,and then beam ends,meeting the strong column weak beam.Collapse occurs when the roof displacement becomes five times that of severe earthquake,resulting in maximum interstory drift ratio of structural top story exceeding 1/50.Therefore,the structure owns a high deformation capacity,totally meeting the requirement of non-collapse during severe earthquake.The result shows that the outer-tube and inter-frame structure has a good seismic behavior.
引文
[1]徐培福,戴国莹.超限高层建筑结构基于性能抗震设计的研究[C]//第五届建筑结构分会年会学术交流会论文集.长春:中国建筑学会建筑结构分会,2006.
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[3]邹钧,吕西林.基于结构性能的抗震设计理论与方法[J].工业建筑,2006,36(9):1-5.
[4]王明珠,管志忠,王树,葛家琪.云顶花园综合楼非线性地震响应分析[C]//第七届全国现代结构工程学术研讨会论文集.杭州:天津大学,2007.
[5]FEMA 273 NEHRP Guidelines for seismic rehabilitationof buildings[S].Federal Emergency Management Agency.1997.
[6]ATC 40 Seismic evaluation and retrofit of concretebuildings[S].Applied Technology Council.1996.
[2]钱稼茹,罗文斌.建筑结构基于位移的延性设计[J].建筑结构,2001,31(4):3-6.
[3]邹钧,吕西林.基于结构性能的抗震设计理论与方法[J].工业建筑,2006,36(9):1-5.
[4]王明珠,管志忠,王树,葛家琪.云顶花园综合楼非线性地震响应分析[C]//第七届全国现代结构工程学术研讨会论文集.杭州:天津大学,2007.
[5]FEMA 273 NEHRP Guidelines for seismic rehabilitationof buildings[S].Federal Emergency Management Agency.1997.
[6]ATC 40 Seismic evaluation and retrofit of concretebuildings[S].Applied Technology Council.1996.
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