Experimental study on mechanical properties of column foot of ancient timber structures – Take the drum-shaped plinth as an example

Abstract

The column foot is a typical structural feature of ancient buildings in China. The sliding rotation of the joint is related to the overall structural safety of the ancient wooden structure. In order to study the mechanical properties of column foot under horizontal force, based on the investigation of column foot forms and referring to the engineering practice of Qing Dynasty, the 1:3.2 scale models of three typical column foundation forms, i.e. Floating, Guan-jiao, and Tao-ding, were made, and the static and quasi-static loading tests were carried out. The horizontal static loading is carried out under the vertical force, and the parameters such as the angle change of the axis, the horizontal displacement load curve, the lateral stiffness and the failure mode are obtained. The results show that: during the loading process, there is no slippage of the wooden column, and the failure mode of the column foot is the overturning failure of the wooden column; The angle formed by the axis of the timber column accounts for more than 25% of the overall lateral displacement, which should not be ignored in the mechanical analysis. The hysteretic curve, skeleton curve, stiffness degradation rate and energy dissipation capacity of different column foot is obtained in the quasi-static test of horizontal low cycle repeated loading. The results show that the shape of the hysteretic loops of the column foot presents an inverse Z shape, and the area of the hysteretic loops increases with the increase of the horizontal displacement; The results show that the energy dissipation capacity of the flat Floating is better than that of the other two forms, and that of Guan-jiao is the second; The results show that Tao-ding has the strongest lateral stiffness, while Floating is slightly weaker.