The flush gable roof is the most popular style of Chinese ancient building.The ancient timber structure has experienced different degrees of damaged after hundreds of years.In order to establish a finite element model which is closer to the actual damage situation,and to study the influence of the damage on mechanical properties of ancient timber structure,an ancient timber structure with flush gable roof in a quadrangle dwelling in Beijing was considered as a research object.Through the nondestructive testing,the structural damage types and damage conditions were confirmed.Based on the nondestructive testing result,both the intact and damaged finite element models of the structure were established,and modal analysis,statical calculation and seismic response calculation were conducted.Finally,the sensitively analysis of the damaged parameters affecting the structural stiffness was proceeded.The study results show that the aging of materials and damage of components and joints reduce the structural stiffness and natural frequency.Under the action of static forces,the maximum stress of components of damaged structure is greater than that of the undamaged structure.Under the action of earthquake,the maximum acceleration,maximum displacement and maximum displacement angle of damaged structure are greater than those of the undamaged structure.Elasticity module is the most sensitive parameter for the structural frequency,while the tension and compression stiffness of the mortise and tenon joint is the least sensitive parameter.
ancient timber structurenondestructive testingdamagedstatical analysisseismic response analysissensitive analysis
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