Study On The Seismic Performance Of Ming Style Historical Timber Structural With Flat-roof Eaves

As the representative of China's ancient wooden structure buildings,the Imperial Palace in Beijing represent the highest level of China's ancient architecture carrying more than 5000 years of China's glorious civilization,is now an important historical heritage in China,has a very high cultural value,artistic value and scientific value.It is important to study the ancient science and culture of the ancient cultural relics protection.Many buildings are built to consider the need of politics,culture,religion and other factors,in order to meet the architectural effect,structure has some shortcomings,so the seismic research of this kind of building is urgently needed.The Imperial Palace brings together all forms of ancient timber structure in our country.The Qin-An palace,the only temple that located in the central axis of the Imperial Palace,is flat-roof eaves timber structural that is one of the architectural forms,And the difference between other palace structure lies in its flat roof,there are four main ridge surrounded by flat roof on the four corners and under the hip roof.This article takes the Qin-An palace as an example of the flat-roof eaves timber structural of Ming Dynasty structure of seismic performance,this paper has completed the following three parts:1.By referring to Fabrication methods of the Song dynasty,Structural Regulations of Qing dynasty and other relevant documents,in-depth understanding of architectural form and structural characteristics of Ming historical timber structural with flat-roof eaves,Considering the size of Qin-An Palace and vibration table,1:5 is the best scale ratio.We simplify the Dou-gong in the test model.The ceiling and other nonstructural components of the prototype structure is unprocessed due to construction reasons.According to the architectural structure and detail construction drawing of the prototype structure of the Qin-An Palace,the 1:5 scale model was constructed.the building subject on a collision course with the suites under powerful earthquake.2.Based on the similarity ratio,the similarity between the model and the prototype structure in acceleration and displacement is determined.Shaking table test of the model structure is completed.The results show that the energy consumption can be dissipated by the reciprocating motion of mortise and tenon joints and the deformation of wood.The Dougong layer has a good damping effect,can effectively reduce the response of superstructure,the lower upper was destroyed seriously.The relative displacement between the inner column and the eave column is too large to cause joint failure.the Ming style historical timber structural with flat-roof eaves has great Seismic capacity and its column and beam has great safety margin.3.The finite element software ANSYS/LS-DYNA was used to accomplish the numerical modeling of the test model.Some simplified measures are adopted to the structure according to the existing research results about the structural characteristics and construction measures of ancient buildings,including that;the beams and columns are always in elastic state during earthquake,brick walls and columns are consolidated together without considering the friction effect,The Dou-gong is simplified into a short column for consideration,simulate the mortise and tenon joints with spring.By comparing the simulation results with the experimental results,the advantages and disadvantages of the simulation method are verified...