高烈度地区超限高层建筑结构设计

Structure design of ultra-limit high-rise building in high intensity area

宿迁丽都水岸9#楼为主体高度99.5m的超限高层建筑,采用剪力墙结构体系。工程位于高烈度地区,若采用传统的抗震设计方法,位移很难控制,构件截面太大且中震设计时双向水平地震下墙肢全截面由轴向力产生的平均名义拉应力过大。结构设计时设置了黏滞阻尼墙,按10%等效阻尼比进行结构设计,构件截面相对减小,增加了使用面积。考虑结构平面不规则和高度超限等不利因素,采用两个不同力学模型的三维空间分析软件SATWE和ETABS进行了整体内力位移计算,通过弹塑性时程分析找出结构的薄弱部位,并采取了有针对性的加强措施,最终能够达到小震弹性、中震可修、大震不倒的抗震性能目标。

The 9#building in Lidu Waterfront District of Suqian City is an ultra-limit high-rise building which is 99.5 meters high,with shear wall structure system.The project is located in high earthquake intensity area.Supposing that the traditional design method was taken,the displacement would be quite difficult to be controlled while with too large members.Besides that,the average nominal tensile stress produced by the axial force would be too large for the whole section under the medium earthquake.The structure design included viscous damping wall with 10%equivalent damping ratio,which made the sections of the members reduced relatively while increasing the usable area.However,some adverse factors,such as irregular plane and height exceeding limit,were still existed in the structure.So two kinds of three-dimensional analysis software SATWE and ETABS were adopted,to calculate internal forces and story drift.Through the elastic-plastic time history analysis,the weak positions of the structure were found out,based on which the corresponding strengthening measures could be developed.Thus the building can get good performance which is elasticity under small earthquake,restored under medium earthquake and not collapsing under large earthquake.