【摘要】 北京财富中心二期办公楼结构总高度265m,将成为继国贸三期A座之后,8度抗震区北京的第二高楼和采用钢管混凝土框架+钢筋混凝土核心筒结构体系最高的建筑。建筑平面长宽比达到1.5,通过合理布置及专业协调,有效降低了扭转效应对超高层结构的不利影响。结构沿竖向设置了四道含伸臂桁架和腰桁架的加强层,并将组合钢板剪力墙应用于核心筒底部加强区,有效地增强了结构的整体抗侧刚度,改善了其抗震性能,同时也减小了墙体厚度及自重。外框柱通高采用大直径圆钢管混凝土柱,有效减小了截面尺寸及用钢量。对结构进行了弹性及弹塑性动力时程分析,采取有效措施,降低了高柔结构高振型对结构顶部鞭梢效应的不利影响,提高了整体安全度。结构设计在规范基础上,满足了全国抗震审查专家组提出的一系列超限措施要求,其整体结构方案和构件选型在用钢量、防火性能、风载舒适度等方面体现了明显的综合经济性能,成功降低了结构总造价。更多还原

【Abstract】 The Beijing Fortune Plaza 2 office tower is 265m tall and will become the second tallest building after the CWTC 3A mega tower in Beijing at intensity 8 seismic zone and the tallest building adopting composite structural system composed by concrete filled tube frame and concrete core.The length-to-width ratio is close to 1.5,but unfavorable influence caused by torsional effect is successfully reduced by a rational control on the structural layout.Four strengthened-stories with outriggers and belt trusses are installed to provide additional lateral strength.Composite steel plate wall(CSPW) is adopted in the lower level of the core to increase the lateral stiffness and enhance seismic performance effectively,at the same time reduces the self weight with thinner wall as well. Large diameter circle concrete filled tube(CFT) column is used in the perimeter frame along overall height,thus greatly reduces the section size and the amount of steel consumption.Based on the elastic and elasto-plastic time history analysis, the effective measures are taken to resist the significant influence from whiplash effect for the tall and slender structure caused by high order models,thus enhanced the structural safety.The seismic design of the tower has satisfied the additional requirements by expert panel review based on the general Chinese seismic codes.The structural scheme and member selection reflect comprehensive economic advantages in aspect of steel tonnage,fire proof and wind comfort,etc.Thus,the construction cost is successfully decreased.更多还原