考虑结构和展柜实际动力特性的浮放文物地震响应分析  

Seismic response analysis for freestanding artifacts considering actual dynamic properties of the museum structure and showcase

作　　者：刘佩[1] 惠大城 袁晨瑜 宿仲真 LIU Pei;HUI Dacheng;YUAN Chenyu;SU Zhongzhen(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;National Academy for Mayors of China,Beijing 100029,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]全国市长研修学院,北京100029

出　　处：《世界地震工程》2025年第1期110-120,共11页World Earthquake Engineering

基　　金：国家自然科学基金面上项目(52478492);国家重点研发计划项目(2023YFF0906000,2019YFC1521000)。

摘　　要：目前评估文物地震安全性时,未充分考虑博物馆和展柜的实际动力特性对文物地震运动响应的影响。对某实际博物馆进行了现场环境振动测试,识别得到了符合现状的结构动力特性;对某实际独立展柜进行了现场锤击测试,识别得到了其自振频率。建立了结构实测动力特性修正前后的2种线性有限元模型、不考虑和考虑结构周期折减的2种非线性有限元模型,分析了不同地震波下4种模型中楼层相对于地面的加速度放大效应;建立了展柜的有限元模型,分析了不同楼层波下展柜相对于楼层的加速度放大效应;考虑文物与展柜台面间接触界面的非线性,建立了纯滑移、纯摇摆和滑移-摇摆耦合文物的有限元模型,并与理论运动方程所得响应进行了对比,分析了不同结构模型中位于不同楼层的展柜对浮放文物运动响应的影响。结果表明:相比另外3种模型,经实际动力特性修正后的线性结构模型中,展柜相对楼层的峰值加速度放大系数均值在小震和中震下均为最大,且大部分情况下该结构模型中文物的响应最大。The influence of the actual dynamic characteristics of museums and showcases on the seismic motion response of artifacts has not been fully considered when evaluating the seismic safety of artifacts.Ambient vibration tests were conducted in a real museum.The dynamic characteristics of the museum structure representing its current conditions were identified.Hammering impact tests of a real showcase were conducted.The natural frequency of the showcase was identified.Two linear finite element models before and after updating and two nonlinear finite element models with and without considering natural period reduction of the structure were developed.The acceleration amplification effects of the floor to the ground were analyzed using the four models subjected to different ground motion records.A finite element model of the showcase was established to analyze the acceleration amplification effects of the showcase to the floor subjected to different floor motions.Finite element models accounting for the nonlinearity of the contact interface between the artifact and the showcase were established,including pure sliding,pure rocking,and sliding-rocking coupling artifacts.The simulated responses were compared with those obtained from theoretical motion equations.The effects of showcases on different floors on the motion responses of freestanding artifacts in the four structural models were analyzed.The results showed that the linear structural model updated using the identified dynamic properties of the real museum had the largest mean amplification factors of peak showcase acceleration for minor and moderate earthquakes.Meanwhile,the artifacts in this model exhibited the largest response in most cases.

关 键 词：环境振动测试 锤击测试 动力特性 展柜 浮放文物 

分 类 号：TU311.3[建筑科学—结构工程]