江浙地区抬梁和穿斗木构体系典型榫卯节点受力性能

Mechanical properties of typical mortise-tenon joints of post and lintel construction and column and tie construction of timber buildings in Jiangsu Province and Zhejiang Province

针对江浙地区抬梁和穿斗木构体系中馒头榫、透榫、半榫及瓜柱柱脚直榫4种典型榫卯节点,通过试验研究其在低周反复荷载作用下的破坏模式、滞回曲线、骨架曲线、转角刚度、延性系数及耗能能力.结果表明:馒头榫、透榫、半榫节点的滞回曲线均呈Z形,具有明显的捏拢特性,而瓜柱柱脚直榫节点的滞回曲线呈反S形,较不饱满;这4种榫卯试件均经历了弹性阶段、屈服阶段和破坏阶段,耗能能力随着节点转角的增加而减小;在节点耗能能力上,按从优到劣排序分别为半榫、馒头榫、透榫、瓜柱柱脚直榫.研究结果可为抬梁和穿斗木构建筑的计算分析及保护修缮提供理论基础.

Four kinds of the typical mortise-tenon joints, the Mantou mortise-tenon joint, the Tou mortise-tenon joint, the Ban mortise-tenon joint and the Guazhu straight mortise-tenon joint, of the post and lintel construction and the column and tie construction of timber buildings in Jiangsu Province and Zhejiang Province are investigated. Their corresponding failure modes, hysteretic curves, skeleton curves, rotation rigidities, ductility factors and energy dissipation capacities under the low cyclic loading are experimentally studied. The results show that the hysteretic curves of the Mantou mortise-tenon joint, the Tou mortise-tenon joint and the Ban mortise-tenon joint are Z-shaped and exhibit obvious pinch effects, while those of the Guazhu straight mortise-tenon joint are S-shaped and not plump. Dur- ing the process of the tests, these four kinds of mortise-tenon joints orderly pass through the elastic stage, the yield stage and the failure stage. The energy dissipation capacities of these mortise-tenon joints decrease with the increase in the joint rotation. The sequence of the energy dissipation capacity in descending order is： the Ban mortise-tenon joint, the Mantou mortise-tenon joint, the Tou mortisetenon joint, the Guazhu straight mortise-tenon joint. The results can provide the theoretical base for computing analysis and repair design of these two constructions of traditional timber buildings.