基于整体模型的塔器框架基础的抗震分析

SEISMIC ANALYSIS OF TOWER FRAME FOUNDATION BASED ON INTEGRATED MODEL

自支撑塔器包含落地式基础与框架式基础两种结构,框架式基础的抗震分析比较复杂,是抗震设计中的一个难点。对于框架式基础,常规方法中,采用框架支撑的塔器和支撑框架通常解耦分析,塔器与框架基础分别单独进行抗震分析,计算模型均未能充分反映塔器与框架的组合结构振动特性,与工程实际差别较大。文章建立塔器与框架的整体组合结构模型,考虑了框架、塔器的质量和刚度沿高度方向的分布,经对比分析,基于整体模型计算的地震作用小于常规简化方法,符合工程实际,能有效优化框架抗震设计与塔器抗震设计。

The self-supporting tower foundation includes two types:ground foundation and frame foundation.The seismic analysis of frame foundation is more complex,which is a difficult point in the seismic design.For the frame foundation,decoupled analysis is usually adopted for the frame supported tower and the supporting frame in the conventional method,and seismic analysis is carried out separately for the tower and frame foundation.The calculation model can't fully reflect the vibration characteristics of the combined structure of the tower and the frame,which is quite different from the actual engineering.In this paper,the overall combined structure model of tower and frame is established,and the distribution of mass and stiffness of the frame and tower along the height direction is taken into consideration.After comparative analysis,the seismic effect based on the overall model is less than that of the conventional simplified method,which is in line with the actual engineering.This can optimize the seismic design of frame and tower effectively.