In this study, we focus on the feasibility of structural topology optimization for a steel-timber composite beam design of optimally allocating glue-laminated timbers into a web with openings under the condition of given steel flanges. The motivation of this study is to topologically take maximal stiffness harmonizing both tension and compression performance of the steel-timber composite beam and become the eco-frandly timber design for buidling members. As a result of this study, the key web-openings allocation becomes triangle spaces, i.e., empty or no materials, of optimal topologies of both a pure timber plate and a steel flange-web timber plate without web-openings. Several applicable examples verify the effectiveness of topology optimization for steel-timber beams with web-openings.

Abstract
1. 서론
2. 다중재료 위상최적화 이론
    2.1 다중재료 보간식
    2.2 교대 능동 위상 알고리즘
3. 목적함수의 민감도해석
4. 적용 예제
    4.1 순수 웨브판의 개구부 효과
    4.2 강재-구조용 목재 합성 H형보의 개구부 효과
4. 결론
References

• 이동규(세종대학교 건축공학과 교수) | Lee Dongkyu (Dept. of Architectural Engineering, Sejong University)
• 반티엔탄(세종대학교 건축공학과 박사후연구원) | Banh Thien Thanh (Dept. of Architectural Engineering, Sejong University)