PURPOSES: This study is to estimate nondestructive strength equation based on probability for bridges using field test data.
METHODS: In this study, a series of the field inspection and the test have been performed on 297 existing bridges, in order to evaluate the bridges, based on the test results of the in-depth inspection, and the estimated strengths by means of the nondestructive strength equations are analyzed and compared with results of the core specimen strengths. RESULTS: According to results of analyses, In case of standard design compressive strength of concrete is 18MPa, 21MPa, similar reliability of RILEM equation were 0.89~0.90, but in case of standard design compressive strength of concrete is 35MPa, 40MPa were 0.4~0.56. According to standard design compressive strength of concrete is 40MPa, similar reliability of ultrasonic pulse velocity method equation were 0.56.
CONCLUSIONS: RILEM equation had high similar reliability than other equation in case of standard design compressive strength of concrete is 18MPa, 21MPa, but had low similar reliability than other equation in case of standard design compressive strength of concrete is 35MPa, 40MPa. and ultrasonic pulse velocity method equation had low similar reliability than other equation in case of standard design compressive strength of concrete is 40MPa.

ABSTRACT
 1. 서론
 2. 확률론적 방법에 의한 압축강도 평가방법
  2.1. 구조물 신뢰성 이론
  2.2. 압축강도 신뢰성 평가
 3. 현장 시험결과를 이용한 신뢰성 평가
  3.1. 대상교량 현황
  3.2. 비파괴강도 추정식
   3.2.1. 비파괴 압축강도 추정방법
   3.2.2. 비파괴 압축강도 추정식 선정
  3.3. 현장코어강도 시험의 압축강도 분포
  3.4. 설계기준강도별 신뢰성 분석
 4. 결론
 REFERENCES

• 김훈겸(서울특별시청 도로시설과 전문관·공학박사) | Kim, Hun-Kyom 교신저자