In order to explore the influence of section parameters and joint forms on the seismic performance of the straight-tenon joints with a bolt pin,four full-scale joint specimens were designed and fabricated,with beam height and beam width as the research parameters.In addition,they were compared with the through-tenon joint with a bolt pin.Then,through low-cycle reciprocating loading tests,the failure modes,hysteresis loops,skeleton curves,ductility,strength degradation,stiffness degradation,and energy dissipation capacity of the joints with different parameters were studied.Finally,the theoretical formula of bending moment versus angle of the straight-tenon joints with a bolt pin was derived and compared with the experimental results.The study results show that the primary failure modes of the specimens are the tension failure along the tension edge of the beam tenon inside of the column,accompanied by the extrusion deformation of the compression edge of the beam tenon inside of the column and the horizontal splitting of the beam tenon outside of the column.The hysteretic loop of bending moment versus angle of the joints shows an anti-Z shape with an obvious pinching effect.Within the range of experimental design parameters,with the increase in beam section height and beam section width,the rotational stiffness and flexural bearing capacity of the straight-tenon joints with a bolt pin increase,but the changes of strength degradation coefficient and equivalent viscous damping coefficient are not obvious.Compared with the through-tenon joint with a bolt pin,the flexural bearing capacity of the straight-tenon joint with a bolt pin is 62%larger in the downward loading direction and is 26%larger in the upward loading direction,and the bearing capacity decreases more slowly in the post-peak stage.It reflects that the straight-tenon joint with a bolt pin has better seismic performance than the through-tenon joint with a bolt pin.The error between the test and the theoretical formula of the straight-tenon joints with a bolt pin is within 9%.
关键词
木结构民居/有穿销直榫/足尺节点/低周往复加载试验/抗震性能
Key words
residential wood structures/straight-tenon joints with a bolt pin/full-scale joint/low-cycle reciprocating loading test/seismic performance
维普
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