Research On Ground Motion Input Of Movable Cultural Relic Isolation Device

Cultural relics have important cultural,historical and artistic values,and protection is of great significance.Compared with the immovable cultural relics of the building category,the cultural heritage and artistic inheritance undertaken by the collection of movable cultural relics are broader,more numerous and more difficult to protect.The current research focuses on the development of cultural isolation devices,but it is also important to study the unfavorable ground motion database that can be used for the seismic input of cultural relics isolation systems.This topic and this paper take this as an entry point to study the ground motion database for the cultural object isolation system.After reading and summarizing a large number of domestic and foreign related research,this paper uses PEER strong vibration database as the original database,selects the ground motion according to the site category of China,and uses SAP2000 numerical simulation software to establish three cultural objects isolation system.The model,the ground motion input study,obtains the structural response of each model under different site categories,and gives the ground motion order according to the response.In this paper,the research status of the subject at home and abroad is summarized,and the research on the ground motion input of the cultural relics isolation system is put forward.It is necessary to input the ground motion in batches to establish a ground motion database for cultural relics.Ground motions with PGA greater than 50 gal in the PEER database were selected.313 ground motions were selected according to ground motion parameter ordering and site classification.The main work and results of this paper are as follows:(1)The model of three cultural objects isolation system was established by SAP2000.The time history analysis method was used to calculate it.The model vertex acceleration and bearing displacement were selected as parameters to give the order of ground motion under different ground motion amplitudes.Comparing the spectral acceleration-based ground motion sequencing with the single-degree-of-freedom system of the same period,the most unfavorable seismic database for cultural relics is established.(2)Two typical ground motions,including far-field long-period ground motion and near-field pulse ground motion,were selected to input the cultural isolation system to explore its adverse effects.The results show that the displacement of the model bearing caused by two types of ground motions is in the forefront of the ground motion sequencing,and the adverse effects on the cultural isolation system are more prominent.(3)The problem of accelerating the amplification effect on the position where different movable floors are placed on different floors is established.Four museum frame structure models are established to study the acceleration amplification factors of ground motions input on different floors under the input of multiple ground motions.Finally,the input acceleration amplification factors of the cultural isolation system with different amplitudes and layers are given.