This study analyzed the structural performance of a microalgae-based lightweight ecological integration system for large-span structures to achieve carbon neutrality. To address the load problems of existing soil-based ecological systems, a lightweight system utilizing microalgae bioreactors was proposed, and structural performance was evaluated for four types of large-span structures: truss, arch, dome, and cable structures. Structural analysis results through finite element analysis showed that the proposed system achieved a 70% load reduction effect compared to existing systems, with structural performance improvements including 35-40% reduction in maximum deflection, 30-35% reduction in maximum stress, and 25-30% increase in natural frequency. Environmental performance analysis confirmed CO₂absorption capacity of 12-18 kg per m² annually and PM2.5 reduction effects of 15-25%. Economic analysis results indicated that benefits of 3.95-6.7 million KRW per year are generated for a 1,000 m²reference area, creating cumulative benefits of 179.75-227.5 million KRW over 25 years. Verification through the German BIQ House case confirmed CO₂reduction performance of 6 tons per year for 200 m², demonstrating the practical applicability of the system. This study presented the potential of an innovative ecological integration system that can ensure structural safety of large-span structures while simultaneously contributing to carbon neutrality.

Abstract
1. 서론
2. 이론적 고찰
    2.1 대공간 구조물의 개념 및 특성
    2.2 지속가능한 건축 구조 설계의 이론적 배경
    2.3 기존 건축물 녹화 시스템의 구조적 특성및 한계
    2.4 미세조류 바이오리액터 시스템의 기술적배경
    2.5 미세조류 시스템 설계 및 특성
3. 경량 생태융합 시스템의 구조성능분석
    3.1 구조하중 특성 비교
4. 환경성능 분석 및 경제성 분석
    4.1 CO2 흡수 성능 분석
    4.2 실내공기질 개선 및 에너지 효율성
    4.3 경제성 분석
    4.4 전 생애주기 환경영향 평가
5. 참고사례 및 이론적 성능 분석
    5.1 해외 참고사례 분석
    5.2 적용 제약 요인 및 해결방안
6. 결론
References

• 이승중(군산대학교 환경공학과, 박사과정) | Lee Seung-Jung (Dept. of Environmental Engineering, Kunsan National University)
• 박상훈(㈜유창 E&C, 공학박사) | Park Sang-Hun (Corporate Research Institute of Architecture & Eco-friendly Convergence, UooChang E&C Co., Ltd) Corresponding author
• 김성천(군산대학교 환경공학과 교수, 공학박사) | Kim Seong-Cheon (Dept. of Environmental Engineering, Kunsan National University)
• 이호성(전북대학교 지능정보융합공학과, 석사과정) | Lee Ho-Seong (Dept. of Intelligent Information Integration Engineering, Jeonbuk National University)
• 김명준(군산대학교 환경공학과, 박사과정) | Kim Myung-Jun (Dept. of Environmental Engineering, Kunsan National University)
• 김광수(군산대학교 환경공학과, 박사과정) | Kim Gwang-Soo (Dept. of Environmental Engineering, Kunsan National University)
• 서경미(군산대학교 환경공학과, 박사과정) | Seo Kyung-Mi (Dept. of Environmental Engineering, Kunsan National University)
• 박현구(송원대학교 건축공학과 교수) | Park Hyeon-Ku (Dept. of Architectural Engineering, Songwon University)