傳統 木構造 내민部材의 構造的 補强 特性에 관한 연구

Abstract

This study obtained the following conclusions through a test of reinforcement and joint reinforcement using a steel plate in consideration of the deflection and transformation by structural behavior and damage by wood decay in the cantilever members of traditional wood structures.

1. Test of cantilever members 1) In the reinforcement test of cantilever members, yield load increased by 44～135% in the reinforcement test sample compared to the standard test sample, and, specifically, yield load, initial stiffness, and maximum load were augmented in the reinforcement test sample of a double-T form steel plate as well as of a T form steel plate. Therefore, the effect of deflection control is expected through such reinforcement.

2) The coefficient of ductility increased by 7～46% in the reinforcement test sample of a – form steel plate compared to the standard test sample, and other reinforcement test samples were discovered to have deteriorated ductility, overall. 3) Concerning stiffness, initial stiffness was found to increase by 8～40% in the reinforcement test samples of T form and double-T form steel plates. Given the fact that the initial stiffness was much higher in the reinforcement test samples than in the standard test samples, the effect of deflection control in the behavior of cantilever members in the elastic region is expected.

4) In consideration of the characteristics of cantilever members, when any damage is caused by the stress concentration and transformation in the upper part of a corner pillar, yield load was shown to increase more in the reinforcement test sample of which some part was replaced with new members than in the standard test sample.

As above, when summarizing the test results of the cantilever members of traditional wood structures, in consideration of the preservation of original forms for their beauty and structural safety in wooden cultural heritages, cantilever members(Hip Rafter) the reinforcement with the - form steel plate, T form steel plate, and double-T form steel plate is expected to increase yield load, maximum load, and initial stiffness and to control deflection compared to the reinforcement method. Furthermore, if a member is replaced with a new one that is of appropriate thickness according to the depth of damage of the member and if it is reinforced with bolts and nails of T form and double-T form steel plates, it will show structural behavior and reinforcement effect which is similar to that of the standard test sample.