Mechanical property of column footing joint in traditional wooden structure by quasi-static test.

Column is set on the stone base directly in traditional wooden structure, which forms to the very important column footing joint connecting the upper structure and stone base. Column foot transfers compressive force only without any tensile capacity. Columns can rotate around the edge of column foot under cyclic loads. Three 7 ts' ai full-scale column footing joint models based on Ying-tsao-fa-shih were established to study mechanical property of column footing joint under cyclic loads, such as earthquake or wind loads. The mechanical property, hysteretic characteristics, rotation stiffness, stiffness degradation law, equivalent radius and strain of edge point of column footing joint were analysed, and the effects of vertical loads on the above performances were also studied. Results show that compression deformation occurs at the edge of column foot, and rotation point of column foot changes from left to right under cyclic loads. Hysteretic curve with a Z-shape has pinching effect. Restoring moment and equivalent radius are increased with increase of rotation angle first and then constant. The stiffness with great initial value is decreased with increase of rotation angle. Stiffness degradation of column foot happens under cyclic loads. The rotation stiffness is positive during loading, which shows it has preferable rotation capability. Restoring moment, rotation stiffness and strain of edge point have a rising trend with the increase of vertical load. On the contrary, the equivalent radius is decreased with the increase of vertical load. The coefficient of vertical load on restoring moment and rotational stiffness were obtained by test results fitting. [ABSTRACT FROM AUTHOR]