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Experimental Study on the Effective Temperature Calculation of Concrete Box Girder Bridge

콘크리트 박스거더교의 설계 유효온도 산정을 위한 실험적 연구

  • 이성행 (부산대학교 토목공학과)
  • Received : 2020.09.21
  • Accepted : 2020.11.06
  • Published : 2020.11.30

Abstract

To calculate the reasonable design temperature load of a concrete box girder bridge, one bridge test specimen was made. The temperature gauges installed on the bridge test specimen measured 48 sets of temperature per day at 30-minute intervals during the summer and winter periods of one year. The temperature measured at each station was treated statistically to calculate the trend line and standard error, and the temperature distribution and trend line at the representative station were presented. The maximum effective temperature and the lowest effective temperature were calculated from the air temperature suggested by Euro code. The maximum effective temperature was calculated to be 1.5 to 2℃ higher than the Euro code at 35℃ and above. In comparison, the lowest effective temperature was 0.5 to 1.1℃ lower at -13℃ to-19℃. Compared to the effective temperature of this study according to the highest and lowest 50-year frequency of the Yangsan region, the highest effective temperature was 4.7℃ higher, and the lowest effective temperature was 4.5℃ lower. Considering the increasing climate change and reflecting the results of this analysis, it is deemed necessary to make the current temperature design standards larger.

콘크리트 박스거더교의 합리적인 설계 온도하중을 산정하기 위하여, 1개의 교량시험체를 제작하였다. 교량시험체에 설치된 23개의 온도 게이지에서 1년간의 여름과 겨울기간에 30분 간격으로 하루에 48세트의 온도를 측정하였다. 상부 콘크리트와 측벽, 하부슬래브에 두께에 따른 온도변화를 검토하기 위하여 두께에 따라 여러 온도게이지를 부착하였다. 각 측점에서 측정된 온도를 통계 처리하여 추세선과 표준오차를 산정하고, 대표측점의 온도분포와 추세선을 제시하였다. 이를 바탕으로 Euro code에서 제시한 대기온도에서 여름철의 최고 유효온도와 겨울철의 최저 유효온도를 각각 산정하였다. 최고 유효온도는 35℃ 이상에서 Euro code와 비교하여 1.5~2℃ 높게 산정되었고, 최저 유효온도는 -13℃~-19℃에서 0.5~1.1℃로 더 낮게 분석되었다. 양산지방의 50년빈도 최고 및 최저 기온에 따른 본 연구의 유효온도와 비교해 보면, 최고 유효온도는 4.7℃ 높게, 최저 유효온도는 4.5℃ 더 낮게 산정되었다. 점점 높아지는 기후변동을 고려하고, 본 분석의 결과를 반영하면, 현 온도설계기준은 그 범위를 더 크게 하는 것이 필요한 것으로 판단된다.

Keywords

References

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