1. 조사목적 및 현황...9 2. 조사대상 및 조사범위...9 2-1 조사대상...9 2-2 조사범위...9 2-3 조사내용...9 3. 구조 부재의 성능 평가 및 균열의 원인...11 3-1. 콘크리트의 품질 성능...11 3-2 열화 상태...11 3-3 균열의 원인...14 3-3-1 소성 콘크리트의 균열...14 3-3-2 경화 콘크리트의 균열의 주요 원인...14 3-3-3 구조물의 균열의 유형...22 3-3-4 진동에 기인한 균열...24 3-3-5 부동침하의 경우...25 4. 현장 조사방법...26 4-1 강도 추정 및 균열조사...26 4-1-1 Schmidt Rebound hammer...26 4-1-2 Ultrasonic Pulse method...26 4-1-3 균열폭 조사...28 4-2 내구성 조사...28 4-2-1 중성화 정도의 측정...28 4-2-2 접근의 부식정도...29 4-3 진동 및 균열 진행의 판정...30 4-4 철근 탐사방법...31 5. 조사결과 및 원인분석...33 5-1 조사결과...33 가) 주요 균열 부분...35 나) 균열조사 및 강도조사...37 다) 부재의 열화 조사...46 라) 철근 탐사 결과...49 마) 진동 및 균열의 활동성 여부...55 5-2 균열의 주요 원인...58 가) Expansion joint공사...58 나) 진동의 원인...58 다) 부동침하에 의한 원인...59 라) 균열의 원인의 종합...60 6. 구조물의 구조검토...64 6-1 구건물...64 6-2 증축건물...66 6-3 조명탑의 이동...67 6-4 기록 보도전광판의 이동...68 부록 6-1 구건물 구조 계산서...81 부록 6-2 조명탑 이동 구조 계산서...81 부록 6-3 전광판 이동 구조 계산서...118 7. 균열보수법 및 주요대책...119 7-1 보수 대책...119 7-2 기초구조물의 안정...132 7-3 보수, 보강 대책의 비교...141 8. 결론...143 부록 8-1 특기시방서...144 부록 8-2 보강대책의 수량...144 부록 Ⅰ 주요지역의 보 평면도...145 부록 Ⅱ 균열부재와 사진...169