Abstract
The damage is a common condition for existing ancient wood structure which bring down the seismic performance dramatically. In order to investigate the influence of damage on the seismic performance of dovetail mortise-tenon joints, 3 mortise-tenon joints with a 1:3.2 scale were made as the Fabrications Methods of Song Dynasty, including 1 intact joint，1 artificially degraded joint by fungi and 1 artificially degraded joint by termites. Several holes with certain depth were drilled uniformly on the entire surface of the tenon to simulate fungi damage，while several holes were drilled through-cross-sectional on the entire tenon to simulate the damage by termites. The seismic behaviors, such as failure characteristics, hysteretic curve, skeleton curve, degeneration of stiffness and energy dissipation, were compared and analyzed according to the low-cyclic reversed loading tests. The results show that the failure patterns of damaged joints are similar to the intact joint, which 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 man-made termites damage joint are crushed partly in the corner. The hysteretic curves of damaged joints also have obvious “gathering effect”, but the curves are not very full. The rotation bearing capacity, stiffness and energy dissipation of damaged joints are significantly less than the intact one，while the damaged joints degenerate much larger. When the damage degree is similar, the final rotation bearing capacity and stiffness of man-made fungi damage joint is bigger than the man-made termites damage joints, but their energy dissipation capacity is about the some.
Key words
ancient timber structure /
dovetail mortise-tenon joint /
damage /
artificial simulation /
low-cyclic reversed loading experiment /
seismic behavior
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Xie Qifang; Du Bin Li Shuang Xiang Wei Zheng Peijun .
Experimental study on seismic behaviors of damaged dovetail mortise-tenon jointsof ancient Chinese timber buildings[J]. Journal of Vibration and Shock, 2015, 34(4): 165-170
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