Structural Simulation And Collapse Analysis On Yingxian Wooden Tower

Yingxian Wooden Tower is a masterpiece of ancient civil engineering in China.The structure is very complicated.The research of the tower structure is of great significance to promote modern civil engineering and protect cultural relics.The structure of the tower is a unique dry joint timber frame structure in ancient China.In this structure,the support parts of each component are made to be flat and square,and the components are placed horizontally,stacked in vertical direction one by one,just like putting building blocks.The components are discontinuous,and only compressive and frictional interactions are considered.While the components are not sliding,the overall structure can be seen as a continuous frame structure.According to YING ZAO FA SHI and the related research,an idealized restored model of Yingxian Wooden Tower was established.Based on the field investigation,including the modification,reinforcement,damage in the history,the existing damaged model of the tower is established.The three-dimensional engineering finite element software is used to simulate the structural response of two models under gravity load,wind load and earthquake actions.And the force and deformation of each component can be obtained.According to the simulation results,the possibility of collapse is speculated.In this paper,considering the sliding contact in the column base and the bottom of the Lu-tou,the "friction sliding quasi-elastic-plastic modei" is used for the column-base node and the bottom of the Lu-tou,and considering the tenon connections between the column and the architrave,the "quasi-rigid model" is used for the beam-column node.So that the discrete nodes can be simulated in the finite element software.The collapse of the tower structure may be the way defined as"column lateral shift","bucket lateral shift","beam falling from frame" any one in this article.By using YJK engineering software to simulate,this paper can get:(1)The idealized restored model of the tower is intact and does not collapse under gravity load,wind load(basic wind pressure 0.55 kN/m2),earthquake actions(design base seismic acceleration value 0.40 g).(2)The existing damaged model will collapse under gravity load,because of the corner column on the south side in the west of the outside drum in the second floor of shaft lateral shift.