This study addresses the increasing damage to national heritage due to climate change by analyzing the current use of terms that describe deterioration damage phenomena in wooden architectural heritage, and proposes a framework for defining and systematizing these terms. The research found that inconsistencies in the use of terms for the same deterioration damage phenomena and unclear definitions in regular heritage survey and monitoring reports cause confusion in data analysis and accumulation. Consequently, this study followed ISO 704 and KS standards to understand the relational system of terms, proposing a hierarchical structure with "deterioration damage" as the top concept and systematically organizing its sub-concepts. Specific terms such as "crack," and the Korean-originated terms "Gallem" and "Apgoe", were analyzed to establish clear definitions and build a system based on their conceptual properties. The study is expected to enhance the effectiveness of heritage conservation and management, ensure consistency in terminology usage among researchers, and support the establishment of data-based scientific conservation policies. Future research will focus on developing practical standardization strategies for deterioration damage terminology through in-depth discussions with field experts and conducting long-term national-level studies.

This study analyzed displacement records of Sungnyemun Gate's primary structural members, such as columns, beams, and hip rafters, over approximately ten years from 2013 to 2023. Through this, we attempted to examine the behavior of wooden architectural heritage in detail and infer the factors influencing structural change through the deformation revealed during the displacement accumulation process. As a result of the analysis, it was quantitatively confirmed that the prominent structural members of the Sungnyemun gate, including the columns, beams, and hip rafters, continued to move and that the accumulated displacements from the movement led to the structure's deformation. It was also confirmed that member displacements accumulate in a specific direction. In the case of the Sungnyemun gate, even after the structure was stabilized, the columns were tilting inward toward the building, and the ends of the hip rafters and the centers of the beams were moving downward continuously. Furthermore, the behavior of wooden architectural heritage, in which damage accumulates as it undergoes repeated transformation and recovery according to seasonal changes, was also revealed in detail. The deformation of the Sungnyemun gate members shows a common pattern of relatively large behavior in the summer. However, seasonal deformation did not appear the same in all members. Even the same member has an uneven drying speed due to differences in the amount of sunlight received depending on the location, leading to uneven distribution of deformation. This study, while acknowledging its limitations, is significant in that it attempts to examine the behavior of our wooden architectural heritage in detail and discuss its characteristics and influencing factors based on quantitative results of long-term measurements.