暗销在藏式古建筑木结构连接中的作用

Mechanical Role of Dowel in Wooden Connection in Tibetan Ancient Architecture

与传统汉式古建筑木结构相比,藏式古建筑木结构具有连接简单、传力直接、构造简洁等特点,其木结构梁柱节点连接很少采用复杂榫卯和斗拱,主要通过构件的垂直叠压实现节点连接功能,并辅以暗销来定位.文中采用非线性有限元方法,通过建立局部构件精细化模型,研究了暗销在节点连接中的力学作用,得到了描述暗销力学性质的弹簧模型.研究结果表明:暗销使滑移初始刚度略有提高,对构件相对滑移承载极限提高明显.

Compared to traditional Chinese ancient timber structures, the beam-column connection of Tibetan ancient architecture features in simple connections, direct load transmission paths and concise constructions. Mortise-tenon and dougong connections are rarely used in Tibetan ancient architectures. The beam-column connection joint is formed by laminated members with dowels. In this paper, a refined nonlinear FEM model was established and the mechanical role of dowels were studied. A spring model was obtained finally to present dowel properties. The results showed that dowels could increase the initial slip stiffness slightly and improve the bearing capacity of member relative sliding greatly.