Abstract：Research purposes： When continuous beam of high-speed railway is completed, with the passage of time, because of the influence of shrinkage and creep, continuous beam deflection will keep changing. The long-term deflection of the bridge will be affected in different degrees by relative humidity, loading age, shrinkage and creep coefficient. In order to study the influence of the creep and shrinkage of concrete on deformation and internal force of long span bridges, this paper chooses approach practical analysis pattern of creep and shrinkage, reasonably conducts analysis of creep and shrinkage effect, it is very necessary to properly think over the influence of shrinkage and creep.
Research conclusions：(1) The relative humidity reducing, the long-term deflection increasing, are disadvantageous to ensure the bridge line, so increasing the relative humidity, such as the use of steam curing measures has a decreasing effect for the length of deflection of the bridge, is beneficial to keep the bridge line of the bridge. (2) The short loading age of the bridge will also increase long-term deflection, so in the construction process, limiting construction load early in the new pouring of beam section, can reduce the long-term deflection. (3) Creep coefficient has a great effect on the long-term deflection of the bridge, creep coefficient increases, the long-term deflection of the bridge increases, selecting the appropriate creep coefficient is pretty important for predicting the length of the deflection of the bridge, so it is necessary to determine the creep coefficient by taking the test measures in the design of important bridge. (4) This research conclusion has a guiding significance for the construction and pre-camber calculation for the high-speed railway continuous beam.
ZHANG Yun-bo1, SONG Ji-jun2, CHEN Wei1.
Research on the Shrinkage and Creep and Changes of Long-term Deflection of High-speed Rail Continuous Beam[J]. Journal of Railway Engineering Society, 2015, 32(5): 49
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