国家(威海)创新中心超高层连体结构性能化设计

Performance-based Structural Design of Super High-rise Connected Building for National(Weihai) Innovation Centre

国家(威海)创新中心为通过高位连接体相连的两栋超高层塔楼,为非对称双塔连体结构。两个塔楼在27~29层通过三层高跨度60m的连接体连接为一体,连接体采用钢桁架结构。本工程存在楼板开大洞、竖向构件不连续、连体及跃层柱等不规则情况,属于特别复杂的高层建筑结构。结合抗震规范的要求,采用三水准、两阶段设计方法,对主体结构进行了详细的弹性和弹塑性抗震分析,对本工程进行了结构性能化设计。分析结果表明,在地震作用下,主体结构具备较好的承载和变形能力,能够达到小震弹性、中震可修、大震不倒的性能指标。通过罕遇地震作用下的弹塑性分析计算,找出了结构潜在的抗震薄弱部位和薄弱构件,并提出相应的抗震加强措施。

National(Weihai)Innovation Centre super high-rise connected structure is composed of two super high-rise tower buildings that are connected by two toweres.It’s an unsymmetrical twin-tower connected structure.Two tower buildings are connected as a whole by a Span 60 m and 3-layer high connective bodies at 27~29 layer,and the connective body adopts steel truss structure.The project have irregular situations such as large openings in floors,connected structure and partial conversion of vertical components,which are particularly complicated high-rise building structures and pose challenges to structural design.Combining with the requirements of seismic codes,a three-level and two-stage design method was adopted to perform detailed elastic and elasto-plastic seismic analysis of the main structure.The overall stability analysis of the steel grid roof and the truss truss was performed.The analysis results show that under the action of earthquake,the main structure has good bearing and deformation capabilities,and can reach the performance index of elasticity of small earthquakes,repairable earthquakes,and strong earthquakes.Through the elasto-plastic analysis and calculation under the action of rare earthquakes,potential weak seismic locations and weak components were identified,and corresponding seismic strengthening measures were put forward.