风荷载下框-筒结构加强层位置对结构位移与周期的影响

Analysis on Displacement and Period in Framed-Tube Structure with Outriggers

目的研究风荷载作用下框架-筒体结构仅设置一道加强层且加强层位置设置不同时,对框-筒结构的顶点位移、第一振型周期的影响规律.方法建立工程算例模型,改变加强层设置位置,采用三维有限元分析软件ETABS进行分析.结果当框-筒结构仅设置一道加强层时,加强层设置于24～28层时,既位于结构0.44～0.56 h处,结构顶点侧移比较小,当加强层设于26层时结构顶点侧移最小104.3 mm;当加强层设置于19～27层时,既位于结构0.38～0.54 h处,结构第一振型的周期比较小,加强层设置于第24层即0.46 h处时,结构第一振型的周期最小,为5.0348 s.结论风荷载作用下加强层位置对框-筒结构侧移、周期的影响规律可为工程设计和科学研究工作提供参考.

The purpose of this paper is to analysis the influence of displacement and fundamental period of framed-core tube structure under wind force when one outrigger is located in different place in the building.The research method includes two steps：firstly,establishing project model;secondly,changing the location of outrigger and using the general FEM software ETABS.The result shows that the displacement can be controlled well when the location of only one outrigger is settled at 24th～28th floor,namely,of the building.The minimum displacement of 104.3 mm takes place when the outrigger is settled at 26th floor.The period of first vibration mode can be controlled well when the location of only one outrigger is located at 19th～27th floor,namely,of the building.The minimum period of first vibration mode of 5.0348 takes place when the outrigger is settled at 24th floor.The conclusions of the influence of displacement and period of framed-core tube structure under wind force when the outrigger is located in different place in the building can be reference to the design works and scientific research for the future.