This study is planed to solve the overturning problem and manifestation of tensile cracking of plain concrete piers of railroad bridges. For the overturning problem, earth anchors are used to fix the bottom of a pier to a rock-foundation using prestressing cables. Composite of FRP (Fiber Reinforced Polymer)and Steel Plates (FSP) are attached longitudinally on the surface of the pier to prevent cracking. Then, FRP band strips are wrapped onto the FSPs to provide lateral confinement. Push-over tests in field show that the earth anchors are effective in preventing the overturning of the pier, and that the FSPs and the FRP strips prevent the cracking of concrete and increase the strength in bending.

ABSTRACT
 1. 서 론
 2. 콘크리트 교각의 내진 보강
 3. 압축실험
 4. 실험결과
 5. 결론
 참고 문헌

• 곽병기(홍익대학교 토목공학과) | Byunggy Kwak
• 최은수(홍익대학교 공과대학 토목공학과) | Eunsoo Choi