| The timber structure of Chinese ancient architecture is the essence of the aesthetic appreciation of Chinese traditional culture and art.It has its own system and unique style in the history of World Architecture with the characteristics of exquisite art and unique style.The doors and windows are not only the necessary non-structural components of ancient wooden structures,but also reflect the cultural,customs and regional characteristics of different periods.However,in the continuous process of history,doors and windows are damaged by earthquakes,erosion and other different situations,resulting in reduced structural usability.Therefore,it is of great significance to master the performance of non-structural components for the repair and protection of ancient wooden structures.In this paper,the doors and windows of the bell tower(non-structural members)are taken as the research object,and their seismic performance is analyzed by using 1:2 scale model through experimental and theoretical analysis.The main research work completed in this paper is as follows:(1)In this paper,two kinds of timber-infilled walls(D-1 and D-2)are taken as the research objects,and their seismic performances,such as failure modes,hysteresis curves and stiffness degradation,are compared and analyzed through horizontal low-cycle repeated loading tests.Timber-infilled wall mainly occurs in the skirt plate element of mutual dislocation,resulting in Zhongmo plastering and transverse cracks at both ends,cracks at the edge of the cross mortise and shear failure of some mortises and other phenomena.The hysteretic curves of the two kinds of timber-infilled walls are “Z” shape,which shows that the wall has obvious slip.The bearing capacity and energy dissipation capacity of D-1 are obviously better than D-2,which is the result of the joint difference of timber-infilled wall,the difference of skirt height and the different layout of the opening.(2)In order to study the effects of different types of timber-infilled walls on the seismic performance of wood frames,the seismic performance of three timber-infilled wall frames(SJ-0,SJ-1 and SJ-2)under horizontal low-cycle repeated loads was studied and analyzed.The timber-infilled wall frame SJ-0 is a timber frame,the timber-infilled wall frame SJ-1 is a timber frame filled with timber-infilled wall D-1,and the timberfilled wall frame SJ-2 is a timber frame filled with timber-infilled wall D-2.Timberinfilled wall frame mainly occurs some component and joint failure of timber-infilled wall,compression deformation of tenon-mortise joints of timber frame,shear failure of planting between timber-infilled wall and timber frame,etc.Timber frame filled with timber-infilled wall D-1 has better deformation capacity,bearing capacity and energy dissipation capacity than timber frame filled with timber-infilled wall D-2.The overall seismic performance of timber-infilled wall frame is obviously better than that of timberinfilled wall.Therefore,the layout of the doors and windows of the bell tower is reasonable and the main bearing member is the timber frame.The P-? effect on timber frames filled with different types of timber-infilled walls is different.With the increase of horizontal displacement,the pure compressive state of frame and frame changes to the combined action of bending and compression.(3)Through the analysis of the stress mechanism of timber-infilled wall and timberinfilled wall frame,the lateral stiffness formulas of each structure are deduced under the condition of mechanical equilibrium and deformation coordination.The restoring force models of timber-infilled walls and timber frames are proposed to reflect the relationship between forces and displacements of various structures under horizontal low-cycle cyclic loading,which lays a foundation for dynamic elastic-plastic analysis of the overall structure of ancient buildings. |
