光岳楼木结构动力特性及地震响应分析

DYNAMIC CHARACTERISTICS AND SEISMIC RESPONSE ANALYSIS OF GUANGYUE TOWER WOODEN STRUCTURE

文中以聊城市东昌府区光岳楼为例,将EL-Centro波、Taft波和人工波分别调幅成55gal、150gal、300gal作为地震激励三向输入光岳楼有限元模型中。通过模态分析,提取了光岳楼的前六阶频率和前三阶振型;通过模拟对光岳楼的地震响应分析,得到了光岳楼1、2层外金柱柱顶和3层金柱顶、4层柱顶的加速度、位移响应曲线。研究结果表明,光岳楼的前两阶振型以平动为主,第三阶开始以扭转为主;随着地震波激励的不断增大,模型的各层加速度响应、层间位移角和位移响应不断增大;柱础层、铺作层、榫卯节点均具有一定的抗震减震的作用。文中的研究为类似的木结构古建筑的抗震设计提供技术支撑。

The amplitude of EL-Centro wave,Taft wave,and artificial wave are set into 55gal,150gal and 300gal,respectively,as the three-way input of seismic excitation into the finite element model of Guangyue Tower in Liaocheng city.Through modal analysis,the first sixth-order frequency and first-third-order mode shape of Guangyue Tower are extracted.Through the simulation of the seismic response analysis of the Guangyue Tower,the acceleration and displacement response curves of the outer gold pillar tops,the third layer of the gold pillar roofs,and the fourth layer of the Guangyue Building are obtained.The results show that the first two modes of the Guangyue Tower are mainly translational,and the third order is mainly torsional.With the continuous increase of seismic wave excitation,the acceleration response,interlayer displacement angle,and displacement response of each layer of the model continue to increase.The column base layer,the paving layer,the mortise,and the tenon node all have a certain effect of seismic shock absorption.This study may provide technical support for the seismic design of similar wooden ancient buildings.