Earthquake Damage Simulation Of Historical Timber Structure And Seismic Damping Measurements For Storage Cabinet Of Cultural Relics

Historical timber structure experienced great strong earthquake damages in historic earthquakes,i.e.the 1679 Sanhe-pinggu M8.0 earthquake,the 1976 Tangshan M7.6 earthquake,2008 Wenchuan M8.0 earthquake and 2013 Lushan M7.0 earthquake.Obviously,they still have the relative high risk of experiencing unexpected damage in future earthquakes around.The study of the earthquake damage for ancient wooden structures is conducive to its protection.Focus on this goal,this article has mainly done the following tasks.(1)Based on building formulas and other references,wood structure development evolution,basic structure,column mortise,tenon joint and bucket arches are briefly descripted.The earthquake mechanism and the anti-seismic effect of the structure of ancient wooden structure are also analyzed.The basic understanding is that the way of the pillars and pillars are floating,so the natural isolation was achieved.The response of the structure was reduced by a tenon.(2)In order to realize the characteristics of the ancient wooden structure seismic response characteristic of the above characteristics this paper introduce the calculation theory,the calculation process,the time integral method and unit features.The tenon is simulated using a spring-dampedr unit,and the corresponding mechanical parameters are evaluated according to the experimental results of the relevant literature.The beams and column are simulated using beam unit,all are considered the elastic component.The wall and roof use shell unit to simulate.(3)For understanding of the seismic performance of these cultural relic buildings,series of nonlinear dynamic time history analyses were carried out from four PGA levels,i.e.0.05 g,0.1g,0.2g and 0.4g,corresponding to the local seismic risk level of Beijing area with 2 sets of selected ground motions from 1999 Chi-Chi earthquake and 1976 Tangshan earthquake respectively.We study the inner force and deformation response of the process by the typical nodes to get the wooden structure seismic damage.(4).This paper analyzes the possible seismic damage of the original display objects in the seismic event of different intensities,combine with the earthquake damage of the wooden structure itself,the overall damage of the ancient structure and the interior cultural relics can be obtained.In addition to the museum of cultural relics,the rest of the cultural relics are deposited in the cultural relics tank,but lack of the necessary damping measures.Therefor,a modular assembly type shock absorber with viscous damper is designed and the feasibility analysis of shock absorber was carried out as minimizing the environmental interference of the warehouse.Using this kind of design method to do nonlinear numerical simulation analysis of two kinds of different cultural relics arrangement.It is found that the seismic reaction acceleration and displacement of the artefacts are reduced by 50%.Practical shock absorber for shock absorber was used to prevent earthquakes for the storehouse cultural relics.