环带对带水平伸臂的高层结构力学性能的影响

Study on the Effect of Belts on the Mechamic Characteristics of Super High-Rise Structures With Outrigger

探讨了高层框架-核心筒结构在水平荷载作用下的侧移控制方法,分析了设置水平伸臂构件和环带构件对减小这类结构侧移的作用机理。对一60层的框架-核心筒结构通过改变水平伸臂构件、环带构件的设置情况而形成的不同结构方案,采用常用结构设计的三维有限元分析软件ETABS分别对其分析计算;探讨了水平伸臂以及不同刚度的环带对结构自振周期和结构顶点侧移的影响;研究了环带对核心筒剪力的影响,环带对外框柱轴力的影响。分析表明:环带的设置、环带本身的刚度对高层框架-核心筒结构的顶点侧移和自振周期有较大影响;能有效调整外框柱的轴力分布,更好地发挥外框柱的整体作用;环带的设置会加大水平加强层的剪力突变这一不利现象。

A method of sidesway controlling by horizontal loads on high-rise frame-core wall structures was discussed and mechanism of reducing structure sidesway with horizontal outrigger and belt elements had been analyzed. Different schemes of a 60-story frame-core wall structure were analyzed with ETABS, which are obtained by changing its horizontal outrigger and belt elements. The influences of structure natural vibration period and peak sidesway on horizontal outrigger and different rigidity belts were discussed. The influences of shears of core walls and axial forces of outside frame columns effected by the belt were studied. The analysis indicates that the institution and rigidity of belt has further influences on peak sidesway and natural vibration period of high-rise framecore wall structure, effectively adjusts distribution of axial forces of outside frame columns, and further displays integrated performances of all outside frame columns. The analysis also indicates that disadvantageous effects of shearing mutation are increased on the strengthened story with belt.