拔榫状态下古建筑燕尾榫节点性能试验研究

Experimental study on mechancial behavior of dovetail joint in historic buildings out of mortise

为了准确把握节点残损与木构架力学性能的关系,进而为整体结构的安全性评价提供依据,按照《清式营造则例》大式建筑的尺寸,建立了缩尺比为1∶2的四个不同拔榫程度的单间一榀燕尾榫构架模型,通过对其竖向加载试验,得出了节点主要破坏形式、跨中F-f曲线,结合理论并分析试验数据,首次提出了静力作用下跨中荷载与挠度的变刚度线弹性力学模型。文中提供的数据和结论,可供古建筑研究者在进行类似结构分析中提供参考。

In order to find out the relationship between component damage and timber frame bearing capacity and provide the basis for the safety evaluation of a historic structure, according to the magnificent building size defined in the Qing Dynasty construction codes, four groups of typical single dovetail joint frame models of a scale ratio of 1：2 were established. Through vertical loading test of the models, the main damage form and the F-f curve of middle architrave were obtained. Combining with the theories and experimental data analysis, a linear elastic variable stiffness model on load-deflection of midspan was proposed. The data and conclusions can provide reference for researchers to analyze similar structures.