某钢管混凝土框架-核心筒结构振动台模型试验

某钢管混凝土框架-核心筒结构高264 m,抗侧力体系由钢管混凝土外框架、钢板混凝土组合剪力墙和伸臂桁架3个部分组成.为了解此类结构在地震作用下的受力性能和反应特点,对该结构进行了1/30缩尺模型模拟地震振动台试验.通过分析模型结构在8度多遇、基本、罕遇地震和9度罕遇地震作用下的动力特性,对模型结构和原型结构的破坏模式、层间位移、楼层剪力等动力反应进行研究.结合大型通用有限元分析软件ETABS和ANSYS的分析结果,对原型结构的抗震设计提出了改进建议.研究结果表明:原型结构能够满足我国现行规范“小震不坏、大震不倒”的抗震设防标准,即使在9度罕遇特大地震作用下,仍然表现出优良的抗震性能.

Shaking table test on super-tall building with CFT frame and composite core wall

A super-tall building is 264 m in height,which employs the composite system consisting of a concrete filled steel tube frame and a composite core wall.The building employs three parallel structural systems,i.e.,the concrete filled steel tube perimeter frame,the composite steel plate reinforced concrete core wall,and the outrigger trusses,to resist vertical and lateral loads.In order to capture the seismic performances of the structure,shaking table test of a 1/30 scaled model was conducted.Through the observation of seismic performance of the model during frequent,basic,rare earthquake of degree 8,and rare earthquake of degree 9,the failure patterns of the model and prototype structure were studied.The corresponding dynamic characteristics of prototype structure were obtained.Some corresponding measures for improving the design of this structure were also put forward.The results show that the prototype structure can meet the requirement of no damage during frequent earthquakes and no collapse in rare earthquakes.The structural system is able to ensure the life safety even when there is extremely strong earthquake of degree 9.