Study On Integral Seismic Performance Of The Typical Monumental Timber Structure Of Ming And Qing Dynasty

The monumental timber structure of the Ming and Qing is the most surviving ancient building in the Ming and Qing Dynasties.It represents the development level of the wooden structures of ancient Chinese buildings in this period.It has important historical value,scientific value and research significance.In order to deeply study the overall seismic performance of this type of structure and evaluate its structural state,and to provide a reference for subsequent corresponding reinforcement measures,this thesis takes the typical monumental timber structure in Ming and Qing Dynasties——single eaves hip roof style structure as the research object.Based on the reasonable finite element modeling method verified by the shaking table test of the single layer gable and hip roof type model,the overall numerical model is established,and the seismic time history method is introduced to conduct dynamic analysis of the structure and study its seismic response;further complete the energy of the structure under multiple seismic waves Transformation analysis;Finally,the energy-based seismic performance index of the structure is proposed.The main research and results are as follows:(1)The calculation and analysis of the finite element model of a typical monumental timber structure in Ming and Qing Dynasties were carried out,and the results were compared with the on-site dynamic measurement results to verify the reliability of the model.A single layer gable and hip roof type top and concrete slab top model with the same weight as the model roof was established,and the three were loaded with multiple ground motions of the same strength,and the dynamic response was compared and analyzed.The results show that under the same quality,the roof stiffness has little effect on the overall seismic performance of the wooden structure of the Ming and Qing official ancient buildings;The acceleration and displacement responses of the concrete slab roof model are between the top of hip roof and the top of the single layer gable and hip roof type with little difference,indicating that it is feasible to replace the roof with concrete slabs in the research.(2)Introduce the seismic time history analysis method(ETM)to study the overall seismic performance of the monumental timber structure.Based on the response spectrum of the seismic design code,5 seismic time history curves are generated in MATLAB and loaded on the model to obtain each structure.Comparing the dynamic response of the parts with the results of multiple seismic wave loading,the results show that the column frame tenon and tenon is the structure with the best damping effect in the monumental timber structure,and the seismic time history method can be used for the seismic resistance of the wood structure of ancient buildings.Performance research can effectively improve computing efficiency and can well reflect the dynamic characteristics of the structure.(3)From the energy point of view,conduct an in-depth study on the anti-seismic performance of the wooden structure of the Ming and Qing monumental timber structure,and analyze the energy conversion and dissipation mechanism of the structure under the action of the seismic time history curve.The results show that when the earthquake energy is input into the wooden structure of the ancient building,Part of the energy is stored in the form of elastic strain energy,kinetic energy and gravitational potential energy when the structure is lifted to buffer the structure,and the other part of the energy is dissipated in the form of structural plastic deformation and damping,and as the seismic input intensity increases,Plastic energy consumption began to increase and rapidly increased,and the gravitational potential energy stored by the structural model also increased,and its proportion was larger than other conversion energy.(4)Under the action of earthquake,the plastic deformation of the wooden structure of ancient buildings mainly occurs at the joints of the column frame layer,indicating that the column frame layer is a weak layer of the structure.Using seismic time history and multiple general seismic waves,the typical monumental timber structure of Ming and Qing Dynasties model was dynamically loaded,and the ratio of the hysteretic energy dissipation of the column layer to the cumulative plastic energy dissipation of the entire structure at the time of failure was taken as the official ancient The evaluation index of the state of the building’s wooden structure refers to the performance level proposed by previous scholars,and proposes an energy-based performance level index for the monumental timber structures of the Ming and Qing Dynasties.243 figures,19 tables,135 references.