大底盘多裙房基础隔震高层建筑参数关系研究
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摘要
针对大底盘多裙房结构体型复杂庞大、水平及竖向刚度分布不均匀、裙房主塔及隔震层参数间关系极大影响隔震体系性能及整体隔震效果问题,对主塔、裙楼层质量、层刚度及隔震层刚度等不同参数变化对整体隔震效果影响规律进行研究。结果表明,隔震层与主塔层刚度比N≤1/14、裙房楼层数与主塔层数比为1/3~1/1.5、群楼相对主塔的层刚度比为0.42~1.1、裙房相对主塔的层质量比P≥1.1时主塔减震效果较优;采用刚性楼板假定所得减震系数设计上部结构可能会夸大减震效果。大底盘须采用弹性楼板假定。该建议可为此类结构基础隔震设计提供参考。
The high-rise structure with multi-skirt building is used widely so as to satisfy the increasing requirement of use functions. Conventionally,in high intensity area,structures adopt isolation technology to promote seismic safety and protect equipments. But, the structure is complex, the horizontal and vertical stiffness are not uniform, so the relationships between parameters of main tower,skirt building and isolated layer will seriously influence the seismic behavior and isolation effect. The influences of different parameters on isolation effect were analysed. The results show that: when the stiffness ratio of isolated layer to main tower is N≤1 /14,the ratio of number of floor of skirt building to main tower is 1 /3 ~ 1 /1. 5,the stiffness ratio of skirt building to main tower is 0. 42 ~ 1. 1,and the mass ratio of skirt building to main tower is P≥1. 1,the main tower can obtain better isolation effect; it is possible to overstate the isolation effect of the upper structure according to the rigid floor assumption,so the large podium must be supposed to be elastic.Above suggestion may provide some references to the design of base isolated high-rise structure with multi-skirt building.
引文
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