The polyurethane spring, which provides the restoring force for a sliding bridge bearing, governs the overall behavior of the bearing. An analytical model, therefore, which reflects actual geometrical shape and can be utilized easily in engineering practice, is needed to be developed. In this paper, a simplified model for analyzing the polyurethane spring utilized in the sliding bridge bearing is presented. The model is developed for a cylindrical tube based on Gent’s model, and can be utilized for various height-diameter ratios. The accuracy of the proposed model are compared to existing models via experimental data as well as numerical analysis results. The comparison result shows that the proposed model can be used in estimating mechanical behavior of the cylindrical tube shaped polyurethane spring.

ABSTRACT
 1. 서 론
 2. 기존 모델 고찰
  2.1 폴리우레탄의 특성
  2.2 기존 간략해석 모델
 3. 내공을 가진 고무실린더에 대한 제안 모델
 4. 실험 및 수치해석결과를 이용한 검증
 5. 결론
 References

• 유용(한국교통대학교 철도시설공학과) | Yoo Yong
• 이민재(한국철도공사) | Lee Minjae
• 백준호((주)에스코알티에스 기술연구소) | Baek Joonho
• 최상현(한국교통대학교 철도시설공학과) | Choi Sanghyun