Almost all buildings and infrastructures made of advanced composite materials are fabricated without proper design. Unlike airplanes or automobiles, prototype test is impossible. One cannot destroy 10 story buildings or 100-meter long span bridges. People try to build 100-story buildings or several thousand meter long span bridges. In order to realize "composites in construction", the following subjects must be studied in detail, for his design. Concept optimization, Simple method of analysis, Folded plate theory, Size effects in failure, and Critical natural frequency. Unlike the design procedure with conventional materials, his design should include material design, selection of manufacturing methods, and quality control methods, in addition to the fabrication method. In this paper, concept optimization and folded plate theory are presented for practicing engineers.

ABSTRACT
 1. 서 론
 2. 구조물 개념의 최적화
 3. 건설구조물 해석을 위한 간편한 방법
 4. Folded plate 이론
 5. 진동 해석
 7. 결 론
 References

• 한봉구(서울과학기술대학교) | Han Bong-Koo
• 김덕현(서울과학기술대학교) | Kim Duck-Hyun
• 최종민(서울과학기술대학교) | Choi Jong-Min