The Nuki-to-Column Joint using wedges has been used in Japanese traditional wooden structures. The joints are the most important structural elements which can resist a horizontal load such as seismic loads or wind loads. The structural characteristics of Nuki-to-Column Joints using wedges has been reported in the previous studies, but the target in the previous studies ware relatively small wooden structures such as residential house and so on. In Japan, there are many historical temples and shrines which have Nuki-to-Column Joints. The member size of the historical wooden structure is much larger than residential house, so it is needed to evaluate the structural characteristics of the Nuki-to-Column Joint for the traditional wooden structures. The purpose of this paper is to evaluate the structural characteristics of the Nuki-to-Column joints with wedges for Japanese historical structures based on the experimental results by the full-scale tests of the Nuki-to-Column joints using wedges.
In chapter 1, we described the significance of this paper.
In chapter 2, we show the method of the full- scale static loading tests using three types of the wedge.
In chapter 3, we considered the influence of the structural characteristics of joints by the wedge shape, the wedge type and the slip out behavior. All specimens showed procession-slip hysteresis in the moment-deformation relations. There are differences in the structural characteristics of the joint and the slip out behavior by the wedge type and the wedge angle. Furthermore, the larger the wedge angle becomes, the slip out behavior becomes larger in both the Futsu wedge and the Naname wedge.
In chapter 4, we estimated the full moment-rotation relation curves of the joint based on the partial compression element tests.
In chapter 5, we proposed the simple estimation method for the structural characteristics of the joint for the structural designs of traditional Japanese temples and shrines. This method consider the slip out behavior of wedge.
The conclusions obtained in this study are as follows:
1) The structural characteristics of the Nuki-to-Column joint using wedges are greatly affected by the shape of wedge and the slip out behavior of wedge.
2) Based on the mechanical models of the Nuki-to-Column joint, we proposed a useful method for estimating the full moment-rotation relation curves of the joints based on the simple partial compression tests for a couple of wedges.
3) The simple and useful method for the calculating the characteristic values for the historical model of the joint are proposed based on the full moment-rotation relation curves estimation method.
