This paper presents the basic data for the structural safety study of the extension wall by evaluating the bending stresses of the existing and extension walls varying according to the plan change of the extension building through the numerical analysis on the horizontal load as follows: 1) the stress variation of the divided wall when the wall opening due to a partial demolition is evaluated by comparing the result of analysis on whether or not the opening of the bearing wall is demolished as a variable; 2) the stress variation of the existing wall due to the increase of the stiffness of the extension wall is also evaluated by comparing the result of analysis on the thickness of the extension wall as a variable.

Abstract
 1. 서 론
 2. 해석계획 및 방법
 3. 해석결과 및 고찰
 4. 결 론

• 유영찬(한국건설기술연구원) | You, Young Chan
• 이현지(한국건설기술연구원) | Lee, Hyun Jee 교신저자
• 신지욱(한국건설기술연구원) | Shin, Ji Uk
• 김민선(한국건설기술연구원) | Kim, Min Sun
• 최기선(한국건설기술연구원) | Choi, Ki Sun