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《Journal of Vibration and Shock》 2015-04
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Tests for aseismic behaviors of damaged dovetail mortise-tenon joints of ancient timber buildings

XIE Qi-fang;DU Bin;LI Shuang;XIANG Wei;ZHENG Pei-jun;School of Civil Engineering,Xi'an University of Architecture and Technology;State Key Laboratory of Subtropical Building Science,South China University of Technology;  
Damage is a common state for existing ancient wood structures,it reduces their aseismic performance dramatically. In order to investigate the influence of damage on the aseismic performance of dovetail mortise-tenon joints,3 mortise-tenon joints with a 1 ∶ 3. 2 scale including 1 intact joint,1 joint artificially degraded by fungi and 1 joint artificially degraded by termites were made according to the fabrication methods of Song dynasty. Several holes with a certain depth were drilled uniformly on the entire surface of the tenon to simulate fungi damage,while several holes were drilled through cross section on the entire tenon to simulate the damage by termites. The aseismic behaviors,such as,failure characteristics,hysteretic curve,skeleton curve,degeneration of stiffness and energy dissipation,were studied comparatively with low-cyclic reversal loading tests. The results showed that the failure patterns of damaged joints are similar to those of the intact joint,they are mainly squeeze deformation of mortise and tenon,and partial evulsion of the tenon,the beams and columns are intact; moreover,for the damaged joints,the evulsion of the tenon is earlier and bigger,and some tenons of the man-made termites damage joint are crushed partly in the corner; the hysteretic curves of damaged joints have obvious "gathering effect",but the curves are not very full; the bending- bearing capacity,and stiffness of damaged joints are significantly less than those of the intact one,while their energy dissipation ability has no change basically; when damage levels are similar,the final bending- bearing capacity and stiffness of the man-made fungi damage joint are bigger than those of the man-made termites damage joints,but their energy dissipation capacity is almost the same.
【Fund】: 国家自然科学基金项目(51108373 51278399);; 国家文物局文物保护科学和技术研究课题(20110123);; 陕西省青年科技新星项目(2013KJXX-56);; 西安建筑科技大学创新团队资助计划
【CateGory Index】: TU366.2
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