Theoretical Research On The Earthquake Resistant Behavior Of The Great Hall Of Mausoleum Of Emperor Yandi

Chinese traditional wood structure is different from reinforced concrete structure and steel structure.People lack enough understanding of the bearing and seismic resisting characteristics of the traditional wood structure.To better understanding of the Chinese traditional wood structure.In the article,the great hall of Mausoleum of Emperor Yandi was chosen as research subject.The seismic resisting behavior of the great hall was analyzed by building structural model and numerical computation.Through structural analysis,the anti-seismic performance of the building was derived,the anti-seismic performance of the building was evaluated,Firstly,the current situation and research on Chinese traditional wood structure both at home and abroad is discussed in the article.Then,by analyzing the mortise and tendon joint,several simulation methods of joints were developed.Finally,according to parameters as dimensions and materials of the great hall of Mausoleum of Emperor Yandi,finite-element structural models was built in ABAQUS and YJK.Modal analysis method and time history analysis method were employed to analyze the model built in YJK under frequent seismic action and rarely occurred earthquake action.Under rarely occurred earthquake action,the finite-element model was analyzed with ABAQUS by time history analysis method.Through modal analysis,the preceding six mode shapes and natural vibration period are calculated.By comparison,The structure is mainly influenced by the preceding three mode shapes.The first two were translation mode and the third was torsion mode.The period of the first torsion mode is smaller than 0.9 times of the period of the first translation mode,which meet the requirement of code.By analyzing the model built in YJK under frequent seismic action,the bearing capacity of main members were calculated.The result shows that stress of all structural members were far from design values,every structural members have enough safety margin,which meet the requirement of the code: When the place is subjected to frequently earthquake influence which intensity is lower than the local fortification intensity,the buildings will not be damaged or only slightly damaged,with continued service without repair.By analyzing the model built in YJK under rarely occurred earthquake action,the largest deformation parts were found,which were intersection points where axis C intersects axis 4 to axis 7 and axis E intersects axis 4 to axis 7 at top of the pillars.Maximum story drift was less than the limit values for elasto-plastic story drift value defined in the code.This also meet the requirement of "no collapsing with strong earthquake"(When the place is subjected to rarely earthquake influence which intensity expected to higher than the local fortification intensity,the buildings will not collapse nor suffer damage that would endanger human lives.)By analyzing the finite-element structural model built in ABAQUS under rarely occurred earthquake action,acceleration time-history curve and joint displacement at top of the column and at top elevation of first floor of column on 4/C axis were obtained.By comparison,under 400 gal El-Centro wave,the maximum acceleration of the great hall’s column top was 4 times that of the seismic wave used.At the same time,the maximum acceleration of structural joints became larger as the height increased,which is in accordance with actual conditions.And the maximum story drift value was less than the required 1/30,which also meet the standard of the code.Through detailed comparisons between the results obtained by ABAQUS and YJK under rarely occurred earthquake action.The discreteness of results obtained by YJK through Modal analysis method and time history analysis method is smaller than that of ABAQUS.The structural deformation were larger than that of YJK.These differences come from different software characteristics,differences of calculation methods,selection of seismic waves and different ways of joint rigidity stimulation.The result showed that,in traditional Chinese wood structure,joint rigidity has great influence on structure.The analyzing and calculation results show that the great hall of mausoleum of Emperor Yandi meet the design principle of "no collapsing with strong earthquake" and "no damage with small earthquake",which also provided theoretical bases for repair and maintenance work of Chinese traditional wood structure.