吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (04): 877-884.doi: 10.7964/jdxbgxb201304006

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Analysis of measured effective temperature and strains of long-span concrete box girder bridge

GU Bin1, CHEN Zhi-jian2, CHEN Xin-di3   

  1. 1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
    2. School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China;
    3. College of Harbour, Costal and Offshore Engineering, Hohai University, Nanjing 210098, China
  • Received:2012-03-26 Online:2013-07-01 Published:2013-07-01

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Abstract:

Based on the measured temperature, meteorological and strain data of the auxiliary shipping channel bridge of Sutong bridge during two years of operation, the effective temperature and strains of concrete box girder were studied. The results show that the smaller size of the concrete box girder, the larger range of the effective temperature. For the bridge with design reference period of 100 years, the ranges of effective temperatures of the concrete box girders at the pier top and at the middle span are (-4.3 ℃, 37.3 ℃) and (-6.1 ℃, 42.2 ℃) respectively. The correlation coefficient between effective temperature and average high (or low) air temperature for 3 consecutive days reaches 0.97, and the equation obtained by regression analysis is quite useful in estimating the extreme effective temperature of the concrete box girder. At last, a method to modify the effect of concrete shrinkage and creep was proposed, and the relative strains at the bottom section of the main pier and at the bottom slab of the box girder adjacent to the main pier were predicted using the effective temperature of the concrete box girder.

Key words: road engineering, concrete box girder, effective temperature, atmospheric temperature, relative strain

CLC Number: 

  • U448.35

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