Glass Fiber Reinforced Polymer (GFRP) shear connectors used in Insulated Concrete Sandwich Wall Panels (ICSWPs) have traditionally been evaluated for composite action based on global stiffness and strength. However, such approaches are limited in capturing local interface behavior and variations in composite action. This study proposes a strain-based shear-flow evaluation method to reflect the local structural behavior of ICSWPs. Theoretical shear flow was analyzed using flexural strain distributions obtained from existing experimental studies. Review of experimental data revealed that composite action decreases under repeated loading due to damage to GFRP shear connectors and interfaces, and that shear flow exhibits nonlinear behavior that is not proportional to the degree of composite action. To evaluate shear flow theoretically, curvature and neutral axis (NA) location were determined from strain distributions using three analytical approaches. Results showed that shear flow was maximized in partial composite action and decreased as composite action increased, with a sharp increase at low composite levels. The proposed approach highlights the importance of considering nonlinear interface shear flow for accurate evaluation of composite action in ICSWPs.

Abstract
1. 서론
2. ICSWPs의 실제 거동에 따른 변형률및 전단 흐름 분석
    2.1 Full-scale specimens
    2.2 강성 기반 합성도 평가의 국부거동 반영한계
3. ICSWPs의 변형률 및 전단 흐름 분석
    3.1 전단 흐름 기반 합성도 평가 방법
    3.2 변형률 기반 전단 흐름 산정 방법
4. 곡률과 중립축 위치에 따른 전단 흐름분석
    4.1 Case 1: 합성도에 따른 곡률 산정
    4.2 Case 2: 합성도에 따른 중립축 위치 산정
    4.3 Case 3: 합성도를 제외한 곡률 및 중립축 위치 산정
    4.4 Theory-Experiment Consistency inShear Flow
5. 결론
감사의 글
References

• 전하연(계명대학교 일반대학원 건축학과, 석사과정) | Jeon Hayeon (Dept. of Architecture, Keimyung University)
• 최인섭(계명대학교 건축공학과 교수, 공학박사) | Choi Insub (Dept. of Architectural Engineering, Keimyung University) Corresponding author