Analysis To Influence Of Gap Between Components On The Bearing Behavior Of The Eighth Level’s Wooden Structure

In this paper, according to Ying-zao-fa-shi of Song Dynasty and the eighth level’s modular, three groups of timber structure model were developed and analyzed. The main contents and the results of this paper are summarized as follows:First, two dovetail joints frame models, including one with gap and other without gap, were developed and analyzed under the different vertical load by the different loading method. The timber structures were subject to horizontal ultimate load under the different vertical load. The Force-Displacement curve was obtained to analyze the changes and differences of horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness. However, the gap between tenon and mortise led to the decreasing of the joint tightness, so the dovetail wooden frame with gap has less horizontal stiffness. The timber structures were subject to horizontal reciprocating load under the different vertical load. The hysteresis curve and skeleton curve were obtained to analyze the differences of hysteretic performance and horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness, the more energy is dissipated. With the increase of vertical load, the hysteresis curve of two models has increasingly obvious “gathering effect”. However, the gap between tenon and mortise led to the decreasing of the joint tightness, so there are lower energy dissipation capacity and worse seismic performance in the model with gap. The earthquake response of timber structure was also analyzed by relative displacement and acceleration of both ends of column. It can be concluded that, the column of the models has small swing amplitude. The acceleration is different between the model with gap and the model without gap, the gap between tenon and mortise reduces the vibration damping performance.Second, two dovetail joints frame models with Dou-gong brackets, including Dou-gong brackets with gap and other without gap, were developed and analyzed under the different vertical load by the different loading method. The timber structures were subject to horizontal ultimate load under the different vertical load. The Force-Displacement curve was obtained to analyze the changes and differences of horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness. However, because of the gap between Dou-gong’s components, the model with gap has less horizontal stiffness. The timber structures were subject to horizontal reciprocating load under the different vertical load. The hysteresis curve and skeleton curve were obtained to analyze the differences of hysteretic performance and horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness, the more energy is dissipated. With the increase of vertical load, the hysteresis curve of two models has increasingly obvious “gathering effect”. However, because of the gap between Dou-gong’s components, there are lower energy dissipation capacity and worse seismic performance in the model with gap. The earthquake response of timber structure was also analyzed by relative displacement and acceleration of different structural levels. It can be concluded that, the models has small swing amplitude. From the viewpoint of acceleration response, the top of column is larger than the top of models, the damping effectiveness of Dou-gong reduces the acceleration response.Last, the dovetail joints frame models with seamless Dou-gong was modified by the addition of mid-Dou-gong brackets. The timber structure was subject to horizontal ultimate load under the different vertical load. The Force-Displacement curve was obtained to analyze the changes of horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness. The model with the mid-Dou-gong brackets has good horizontal stiffness. The timber structure was subject to horizontal reciprocating load under the different vertical load. The hysteresis curve and skeleton curve were obtained to analyze the differences of hysteretic performance and horizontal stiffness. It can be concluded that, the greater the vertical load and the bigger the horizontal stiffness, the more energy is dissipated. With the increase of vertical load, the hysteresis curve of the model has increasingly obvious “gathering effect”. But the model with the mid-Dou-gong brackets has good horizontal stiffness and energy dissipation capacity. The horizontal stiffness and energy dissipation capacity were improved by the mid-Dou-gong brackets. The earthquake response of timber structure was also analyzed by relative displacement and acceleration of different structural levels. It can be concluded that, the model has small swing amplitude. Earthquakes have less effect on the deformation of timber frame.