|Table of Contents|

Distribution of hydration heat temperature fields for concrete thick-wall structure exposed to time-dependent convection model(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2010年02期
Page:
64-69
Research Field:
Publishing date:
2010-04-20

Info

Title:
Distribution of hydration heat temperature fields for concrete thick-wall structure exposed to time-dependent convection model
Author(s):
ZHANG Gang;  HE Shuan-hai
Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
bridge engineering;  concrete box girder;  time-dependent convection model;  hydration heat temperature field;  wind speed
PACS:
U441.5
DOI:
-
Abstract:
Aimed at temperature fields distribution problems of concrete box girders on high piers, the wind speed was considered, the time-dependent convection heat conduction model was built, the finite element procedure ANSYS was applied to analyze hydration heat temperature distribution for concrete box girders under condition of the time-dependent convection coefficients and stable convection coefficient, the distribution laws of hydration heat temperature distribution for concrete box girders under condition of time-dependent convection heat conduction model was generalized, and the results were compared to the actual measurement value. The results indicate that: the time-dependent convection heat conduction model is adapt to calculate hydration heat fields of concrete box girders on high piers; the distribution of hydration heat temperature fields for concrete box girders gradually decrease from the inner to the outer as the centre of copulation parts for web plates and upper plates and floor plates and tabula plates; with extension of time, the distribution shape of hydration heat temperature fields is similar except its different value; the wind speed has an effect on peak value of hydration heat temperature, its occurrence time is about the 56 hours under condition of the time-dependent convection model, its occurrence time is about the 80 hours under condition of the stable convection model, the increment of wind speed can decrease the peak value of hydration heat temperature, and reduce its occurrence time. 1 tab, 5 figs, 13 refs.

References:

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Last Update: 2010-04-20