高性能粉煤灰混凝土橋梁徐變變形控制研究

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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優(yōu)越性能在橋梁等結(jié)構(gòu)工程中得到廣泛應(yīng)用[1]。（剩余5880字）