海口中心主塔楼混合结构方案分析与设计

Mixed structural scheme analysis and design of main tower building of Haikou Center

以位于高烈度区的海口中心主塔楼为例,介绍了该建筑的主要结构特性。该塔楼采用了带伸臂桁架和腰桁架的加强层及斜支撑的方钢管混凝土框架-钢筋混凝土核心筒结构体系。对结构进行了小震作用下的反应谱分析和时程分析,并分别运用SATWE和ETABS两种软件对结构进行整体计算分析和对比,从而保证了计算结果的可靠性;对结构设定适宜的性能目标,完成了结构在中震作用下的计算分析;为控制性能目标为中震不屈服时核心筒底部墙肢的拉应力水平,调整了结构布置以优化外框架和核心筒的抗侧承担率;并采用ABAQUS软件对结构进行大震作用下的动力弹塑性时程分析,从而实现结构的性能化设计。

Taking main tower building of Haikou Center located in the high-intensity seismic region as example,main structural characteristics of the building were introduced and structural system of concrete-filled steel tubular frame-core wall structure with outriggers and belt trusses in strengthening layers and diagonal bracings was adopted. The response spectrum and elastic time-history analyses under the frequent earthquake were carried out. In order to ensure the reliability of calculation results,softwares of SATWE and ETABS were used to compare the overall calculation and analysis results.Appropriate seismic performance objectives of the structure members were set up and the analysis under the fortification earthquake was completed. To control the level of the tensile stress of bottom shear wall in core wall under the performance objective of non-yielding under the fortification earthquake,the structure arrangement was adjusted to optimize the lateral resistance ratio of frame and core wall. Elastic-plastic time-history analysis under the rare earthquake was analyzed by using ABAQUS software. All the analyses ensured the completion of performance-based seismic design.