【作者】 周乾； 闫维明； 纪金豹；

【Author】 ZHOU Qian;YAN Wei-ming;Ji Jin-bao;Palace Museum;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology;

【机构】 故宫博物院； 北京工业大学工程抗震与结构诊治北京市重点实验室；

【摘要】 为保护馆藏浮放文物,研制了一款直线导轨式文物展柜水平隔震装置。以某博物馆展柜及柜内文物为对象,制作了等比例模型。将隔震装置安装在展柜底部,采取振动台试验方法,测试了隔震装置的隔震性能,并与非隔震情况进行了对比。通过输入水平单向地震波,对比分析了隔震/非隔震条件下系统的动力特性、加速度响应特征、动力放大系数等参数。试验还讨论了隔震条件下,文物、隔震装置的位移响应特征及隔震装置的复位能力。结果表明:非隔震条件下,展柜的基频为f0=13.5Hz,文物的加速度响应随着地震波强度增大而表现明显,动力放大系数Df始终大于1,且文物在较大地震烈度作用下很容易产生倾覆现象。与之相对比,隔震系统(隔震装置+展柜+文物)基频为f=0.775Hz,阻尼比为ξ=4.5%;在不同类型、不同强度的地震波作用下,文物均能保持稳定振动状态,其位移及加速度响应始终很小,动力放大系数D均小于1;隔震装置的行程始终在容许范围内,且装置具有良好的复位能力。因此,本直线导轨式隔震装置具有很好的隔震效果。更多还原

【Abstract】 To protect museum cultural relics against seismic damage, a linear rail type of level isolation device for museum showcase is developed. To study its isolation performances, shaking table tests are carried out. Model of showcase and replica of a ceramic cultural relics are made, the replica is set in the showcase by free-standing status. 2 conditions for the showcase boundary are considered: isolation condition- it is fixed to top of the isolation device, and the device free stands on shaking table board; non isolation condition- it is directly fixed to the shaking table board. Under level earthquakes, dynamic characteristics of the showcase are obtained; seismic responses such as acceleration, dynamic magnification coefficient and so on of the replica are discussed. Besides, under isolation condition, displacement response of both the isolation device and the replica are studied, re-centreing ability of the device is also tested. Results show that under non isolation condition, basic frequency value of the showcase is f0=13.5Hz; acceleration responses of the replica increases with the increase of input earthquake intensity, its dynamic magnification coefficient value Df is always greater than 1, and it is easy to overturn under high intensity earthquake waves. By contrast, under isolation condition, basic frequency of the system(isolation device+showcase+replica) is f=0.775 Hz, and its damping ratio is ξ=4.5%; both the replica and the showcase keep stable vibration status under different intensity of earthquake waves; dynamic magnification coefficient value of the replica is always less than 1. For the isolation devices, its maximum displacement value D is always within the permission scope, and it also has good re-centering ability. Thus the linear rail type of level isolation device has good isolation performances.更多还原