三台基础的动力特性分析

针对故宫中三大殿的基础(俗称三台基础),首先综合现有资料并采用复合材料理论,求得其几何及材料参数;而后建立了研究三台基础动力特性的典型单元,并求得其频率衰减域;在此基础上,通过参数分析揭示了卵石含量和初压应力对衰减域的影响规律;最后,给出了三台基础的频域响应数值分析.研究工作增进了人们对三台基础动力特性的认识,为改进相关基础设计提供了指导.

Dynamic Properties of the Foundation of Three Platforms

Aiming at the foundation of the 3 main palaces in the Forbidden City (referred to as foundation of the three platforms). First, this paper syntheses the existing data and uses the theory of composite mechanics to obtain its geometric and material parameters; Secondly, a typical unit for studying the dynamic characteristics of foundation of the three platforms is established and its frequency attenuation zone is obtained; On this basis, the influence law of pebble content and initial stress on attenuation domain is revealed by parameter analysis; Finally, frequency domain analysis for the foundation is performed. The research provides a new insight for understanding the dynamic characteristics of this kind of foundations and it provides guidance for improving relevant foundation design.