固定和浮放条件下文物展柜动力响应分析与试验研究

Dynamic response analysis and experimental study on the fixed and floating cultural showcases

目前对文物保护的研究主要以试验为主,本研究试图用数值方法分析文物展柜的动力学特性,以解决试验分析方法所导致的缺陷。为此,对固定和浮放两种不同边界条件的文物展柜进行地震作用和简谐激励下的动力响应分析,给出了展柜展台面处的加速度动力放大系数(简称放大系数)上限值。以某博物馆展柜为原型,按1∶1/0.39进行缩尺振动试验,得出两种边界条件下展柜展台面处的放大系数。对试验展柜建立有限元模型,通过与试验对比,验证模型及分析方法的正确性。然后,建立展柜模型的有限元模型,对5种尺寸的展柜进行了动力响应分析,并考虑激励幅值、激励频率等对放大系数的影响。分析结果有助于指导文物的防震保护工作。

The dynamic response of cultural showcases under seismic and simple harmonic excitation is described in this paper. The upper limit of the acceleration magnification coefficient of the booth surface was determined for the fixed and floating showcases. First, the vibration experiments according to 1＊ 1/0. 39 of a museum exhibition shelves were carried out to obtain the amplification coefficient of the surface of the showcase booth under two kinds of boundary conditions. The simulated results were compared with the experimental data to verify the correctness of the finite element model and analysis method. Second, the finite element model of the prototype was established in order to consider the influence of the excitation amplitude and excitation frequency on the amplification coefficient of the five sizes of showcases. These research results will help to direct the work for protection of cultural relics.