带刚性伸臂减震层高层结构抗震性能对比与分析

Comparative Analysis of Seismic Performance on High-rise Building with Damped Rigid Outrigger Storeys

通过推导三角形形式钢管伸臂对有效层间位移的放大公式,得到了带刚性伸臂减震层高层结构中黏滞阻尼器的模态附加阻尼比计算公式.以一个框架-核心筒结构为例,对其分别设置刚性伸臂减震层、对角支撑减震层及加强层在近场脉冲波和非脉冲波作用下的抗震性能进行了对比与分析.结果表明,带刚性伸臂减震层高层结构的抗震性能在3类结构中最为优越,而脉冲波则会导致层间位移等性能指标大幅增加,设计时不容忽视.同时,带刚性伸臂减震高层结构抗震性能的提高与剪力墙到外框柱轴线间的距离成正比,与层高成反比,与阻尼器竖向夹角的余弦相关.

Through deriving the amplification formula of effective inter-storey displacement for triangle form steel outriggers, the formula of additional modal damping ratio for the high-rise building with damped rigid outriggers were presented. Taking the frame-core-tube structure as an example, the frame-core-tube structures with damped rigid outriggers, diagonal-brace damping layers, and strengthened storeys, respectively, under the action of pulse-like earth- quake waves and non pulse-like earthquake waves were analyzed and compared. The computing results show that the structure with damped rigid outriggers exhibits the best seismic performance in the above three frame-core-tube structures, and the pulse-like earthquake waves make a great enhance on seismic performance of the high-rise buildings. Meanwhile, seismic performance of the structure with damped rigid outriggers is in proportion to the distance of shear wall to outside frame column, but inversely proportional to storey height, and related to the angle of viscous damper.