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Research on Shrinkage and Creep Effect for High-Pier & Long-Span Continuous Rigid-Frame Bridges

Author: TangCan
Tutor: WangJieJun
School: Central South University of Forestry Science and Technology
Course: Structural Engineering
Keywords: Shrinkage and creep - Span continuous rigid frame bridge Deflection Stress Loss of prestress
CLC: U441.5
Type: Master's thesis
Year: 2010
Downloads: 52
Quote: 0
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Abstract


Shrinkage and creep of concrete as a viscoelastic material inherent when varying characteristics . - Span continuous rigid frame bridge is a contraction creep more sensitive to the structural system . Shrinkage, creep effect estimates are not allowed , will directly affect the quality of cantilever construction bridge closed , bridge affect linear aesthetic , the normal life and eventually lead to the maintenance of the bridge premature . Estimates and forecast shrinkage , creep the high pier span prestressed continuous rigid frame bridge deflection and stress effects has important significance to guide the construction and monitoring . Firstly, the extensive collection of research material shrinkage and creep at home and abroad on the basis of shrinkage and creep of concrete mechanism , affecting factors used in the calculation of shrinkage and creep theory , methods and predictive model system summary , comparative analysis of the domestic and foreign mechanism of several commonly used predictive models , factors to be considered , the scope of application . Secondly, Hubei Longtan River Bridge engineering background , field measurement Bridge and into the bridge early in the construction process large deflection and stress data , and the use of large - scale structural analysis software MIDAS / Civil finite element model , respectively, according to China \highway reinforced concrete and pre-stressed concrete bridge design specifications \the forecast is more accurate , more in line with the actual situation of the structure . At the same time , Bridge deflection development and the state of stress in the operating period to predict , provide useful help for normal use and maintenance of the bridge . Finally, according to the highway reinforced concrete and pre-stressed concrete bridge design specifications JTJ023 -85 JTG D62 -2004 two different specifications, the theoretical analysis of the bridge prestress loss due to shrinkage and creep , the analysis showed kinds of norms prestress loss prediction trend is basically the same , but the predicted results of the predicted results of the latter than the former .

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Stress analysis, thermal stress
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