高性能粉煤灰混凝土桥梁徐变变形控制研究

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LIU Xu

（ Xinjiang Railway Survey and Design Institute Co.，Ltd.，Urumqi 83OO11， China）

Abstract：Inorder toreduce theadverseeffectsof crep deformationonthe performance，service life，andsafetyof bridge structures，ahigh-performanceflyashconcrete bridgecrepdeformationcontrolmethodisproposed.Takinghigh-performance flyash concreteasan example，a finite element model isconstructed toobtain thecreepparameters ofthebridge，andto propose methods for extending thetrack laying time，designing thesequence of laying dead loads，and planning the creep deformationcontrolof intermalandextemalprestressedtendons.Theresultsshowedthattheuseoffourcontrolmethods efectivelyreducedthedeflectionandarch valuesofthebridgecausedbycreepdeformation，andefectivelyontroledthelater deformationoftheconcretebridge.Thisindicatesthattheproposed methodsarereasonableandfeasible，andcanprovidea certain theoretical basis for future engineering design.

Keywords： high performance fly ash； creep deformation； bridge components； concrete strength

0 引言

高性能粉煤灰混凝土因其优越性能在桥梁等结构工程中得到广泛应用[1]。（剩余5880字）