带伸臂桁架减振层高层结构抗风效果分析

Analysis on Wind Resistance Effect of High-rise Building with Damped Outrigger Storeys

建立某50层钢框架-混凝土核心筒三维空间结构模型,对原结构和装设伸臂桁架减振层的结构进行顺风向脉动风作用下的时程分析,探讨了减振层数量与布设位置对该结构抗风性能的影响.结果表明:合理的减振层数量及其优化设置可有效改善高层结构舒适度以及抗风性能;以层间位移角和结构顶层峰值位移为控制目标,将阻尼器连续布设在结构中部减振效果较好;以结构顶层峰值加速度为控制目标,将阻尼器连续布设在靠近结构顶部减振效果较好;在黏滞阻尼器的阻尼指数和总阻尼系数等参数不变的条件下,设置多道减振层高层结构的综合抗风性能优于设置单道带伸臂桁架减振层的高层结构.

The three-dimensional finite element model of a 50-storey steel frame-concrete core wall structure was established.The along-wind induced vibration analysis of the structure with/without damping outrigger storeys under the simulating wind load was performed,and the influence of the number and location of the damping outrigger storey on wind resistance performance of the 50-storey core wall structure was discussed.The analysis results show that the rational number and optimal arrangement of the damping outrigger storey can effectively improve the comfort performance of the tall steel frame-concrete core wall structure.If the maximum inter-storey displacement angle or the peak roof displacement is taken as control objectives,damping outrigger near the central structure so as to obtain better vibration reduction effect.If the peak roof acceleration is taken as control objectives,damping outrigger storeys should be installed near the top of the structure so as to obtain better vibration reduction effect.Assuming that the total damping coefficients and other parameters of single viscous damper are unchanged,wind resistance performance of high-rise buildings with different damping layers are compared,and the results indicate that the total performance of the buildings with multiple damping layers is better.