对称大底盘多塔隔震结构塔楼高度变化对塔楼相互作用影响的初步分析

大底盘上存在多个塔楼时,地震作用下各个塔楼及大底盘之间的相互作用无法忽略,而对于隔震结构,其相互作用影响因素更为复杂。本文针对大底盘多塔隔震结构和非隔震结构进行了有限元建模数值分析,研究不同塔楼数量和塔楼高度因素作用下结构的相互影响。引入差异系数CV对多塔结构相互作用影响大小进行评估。多塔层间隔震结构能够降低塔楼间的相互作用效应,使得各塔楼的自振特性及地震响应与其对应单塔更为接近,但塔楼间的相互影响依然存在。多塔结构中间塔楼层数减少时,较高塔楼的地震响应有增大的趋势,设计中不能忽略。

Preliminary analysis of the influence of tower height variations on tower interaction of multi-tower isolation structures with a large podium

When there are multiple towers on the large chassis,the interaction between the towers and the large chassis under the earthquake can’t be ignored,but for the isolated structure,the interaction factors are more complicated. The finite element modeling numerical analysis is carried out for the multi-tower isolated structure and non-isolated structure of the large chassis,and the interaction of the structures under the influence of the number of different towers and the height of the tower is studied. The difference coefficient CV is introduced to evaluate the influence of multi-tower structure interaction. The multi-tower seismic isolation structure can reduce the interaction effect between the towers,so that the self-vibration characteristics and seismic response of each tower are closer to their corresponding single towers,but the interaction between the towers still exists. When the number of floors in the middle tower of the multi-tower structure is reduced,the seismic response of the higher towers tends to increase,which cannot be ignored in the design.