【摘要】 为探索馆藏浮放文物的有效抗震加固方法,采用振动台试验手段,研究了降低重心法加固浮放文物的抗震效果。基于某博物馆展柜原型尺寸,制作了1:1比例陈列柜模型。在陈列柜内浮放一轻质陶瓷文物,并考虑在陶瓷内增设沙袋以降低重心,进行了振动台试验。通过白噪声激励,获得了陈列柜基频分布;通过输入3种类型、4种强度的地震波,获得了陈列柜和文物在地震作用下的典型震害症状、位移响应、加速度响应和和动力放大系数。通过数值模拟,从理论上对降低重心法加固浮放文物的抗震效果进行了进一步论证。结果表明:陈列柜的主要频率在23.7～30.6Hz之间,与输入地震波的基频相差较大,因而在地震作用下震害不明显;降低重心法加固文物后,文物震害减轻,位移及加速度响应减小,但在地震波强度较大时仍可能产生倾覆,因此该方法具有一定的局限性。更多还原

【Abstract】 To find an effective strengthening method for free-standing museum cultural relics,aseismic performances of a cultural relic strengthened by descending barycenter method are studied by shaking table tests.Based on actual sizes of a museum showcase,one 1:1 scale model is built.A light ceramic cultural relic is put in the showcase by free-standing mode,a bag full of sands is considered to put in the relic to descend its barycenter,then shaking table tests are carried out.By white noise excitation,frequency distributions of the showcase are obtained;by inputting 3 different types of earthquake waves with 4 different intensities,seismic responses of both showcase and relic are studied,aseismic results of descending barycenter method are discussed.By simulation method,finite element models for the showcase and relic are built,modal as well as time history analyses are carried out to validate the effectivity of shaking table tests.Results show that prominent frequency ingredients of the showcase are far greater than those of the input earthquake waves,thus the showcase is not damaged seriously;for the relic after it is strengthened by descending barycenter method,its damage symptoms are not so serious as before,its peak displacement and acceleration response values decrease,but it still overturns under strong earthquakes.Thus strengthening effects of the method is limited.更多还原