Material Application Method and Component Damage Analysis of the Pu-Pai Fang in Yingxian Wooden Pagoda
The accumulation of compression and deformation on the transverse grain in Pu-pai Fang is a primary cause of the vertical settlement and damage to the Yingxian Wooden Pagoda structure.It significantly affects the safety performance of the wooden pagoda.In order to study the structure and damage conditions in the wooden pagodas,the number of annual rings,the location of the pith center,and the compression at the pressure of the wood used in each layer were recorded through on-site investigation.The non-destructive testing technology was used to obtain the annual rings of both wide and narrow surfaces and the placement of the wood ends.At the same time,the images of end faces were analyzed to calculate the missing rate and crack rate.The results of the study show that the timber used in Yingxian Pu-pai Fang is Larix principis-rupprechtii Mayr.which is more than 100 years old.The pith of the wood is in the central position.A certain pattern between the width and narrowness of the timber's annual rings and the size of the head arrangement of the timber was observed.Wood transverse grain compression damage is the main form of damages in Pu-pai Fang,of which the degree of compression greater than 20%of the components in each bright layer of the inner groove Pu-pai Fang accounted for 50%.The degree of compression in wooden tower Pu-pai Fang continues to increase as it ages.The local compression of the wood is an important reason for the cracking damage on the end faces.The degree of localized compression in the components strongly correlates with the end-cracking fracture rate.
Yingxian wooden pagodaPu-pai Fangtimber informationdamage analysiscross-grain compression of wood
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