摘要
门厅结构是藏式宫殿建筑地垄结构中唯一的木构架承重结构。由于木构架的残损,可导致其刚度和承载能力均有所降低。为研究某藏式宫殿门厅结构的动力特性及安全性能,通过环境激励下的结构动力特性现场测试识别了门厅结构的东西向和南北向振动的前3阶模态参数。按照实际尺寸建立门厅结构的精细化有限元模型,通过模型设计参数灵敏度分析,确定边界弹簧刚度参数和顺纹承压木构件材性参数作为模型修正参数,基于实测结果采用参数型模型修正方法,使修正后模型的各阶模态频率计算值与实测值的误差小于5%,振型残差小于0.3,振型模态置信准则(modal assurance criterion,MAC)值大于0.9,表明修正后的模型可以较好地反映门厅结构的真实动力特性,可用于后续藏式宫殿门厅结构的状态评估。
The entrance hall structure is the only wooden frame load-bearing structure in the ground ridge structure of the Tibetan palace building.Due to the damage of the wooden frame,the rigidity and bearing capacity of the entrance hall structure are reduced.In order to study the dynamic characteristic and safety performance of the entrance hall structure,this paper identified the first three modal parameters of the east-west and north-south vibrations of the entrance hall structure through the structural dynamic characteristics field test under environmental excitation.According to the actual size of the entrance hall structure,a refined finite element model was established.Based on the sensitivity analysis of model design parameters,the boundary spring stiffness parameters and the material parameters of the compression members parallel to grain were selected as the model correction parameters to update the entrance hall structure finite element model based on the measured results.After updated,the difference between the calculated value and the measured value of each order modal frequency is less than 5%,the mode residual is less than 0.3,and the mode MAC(modal assurance criterion)is greater than 0.9,indicating that the updated model can better reflect the true dynamic characteristics of the entrance hall structure,and can be used for the subsequent state assessment of the entrance hall structure of Tibetan palace building.
作者
杨娜
郭佳琛
常鹏
白凡
王忠铖
YANG Na;GUO Jiachen;CHANG Peng;BAI Fan;WANG Zhongcheng(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory ofStructural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,Beijing 100044,China;Xining Public Works Section,China Railway Qinghai-Tibet Group Co.,Ltd,Xining 810000,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2022年第7期272-281,共10页
Journal of Building Structures
基金
国家自然科学基金面上项目(51778045)
高等学校学科创新引智计划(B13002)。
关键词
藏式宫殿建筑
门厅结构
振动测试
模态参数
模型修正
灵敏度分析
Tibetan palace building
entrance hall structure
vibration test
modal parameter
model updating
sensitivity analysis
