高性能混凝土梁彎曲疲勞性能試驗研究

Experimental Study on Bending Fatigue Performance of High-performance Concrete Beams

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中圖分類號：U24 文獻標志碼：A 文章編號：1005-8249（2025）01-0119-06

DOI：10.19860/j.cnki.issn1005-8249.2025.01.022

ZHANG Zhiguo'，LI Haoran1，2，PAN Jimeng'，GUO Wentao'，SU Jighai3 (1.Shool of Civil Engineering， Shijiazhuang Tiedao University， Shijiazhuang O5OO43， China；

2. Shanxi Construction Engineering Group Co.，Ltd.，Taiyuan O3Oooo， China；3. Shijiazhuang City

Construction Group Constructional Engineering Testing Service Co.，Ltd.，Shijiazhuang O5O00O，China）

Abstract：Double-mixed fine powderadmixture toprestressd concreteismore widelyused in bridges，butthereare some doubts about its mechanicalproperties.Basedonthe similaritytheory，ascaled-dow model girderof1：5wasmade，andthe concrete strength gradewas C5O，loaded with ahalf-sine wave constant stressatafrequencyof5Hz，and2 millonfatigue loading cycles werecarriedout，toanalyzethebendingfatigueperformanceof the model girderwithdiferent dosages doubledoped fine powder.Theresultsshowthatthereis nofatiguecrackinthe model beamafter2milionfatigueloading cycles，the fatigueperformanceisstable，thedestructiveteststrengthdoesnotdecreasesignificantlyafterthefatiguetest，thestaticstre performance is stableafter fatigue，andthedopingoffinepowderhasanobviousimprovement efectontheconcrete beam. Among them，below2O0，OOO cycles，the strainof double-doped finepowderconcrete beams increasedrapidly，and the

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bending stiffessdecreasedrapidly.After more than 2Oo，OOOcycles，therateof strain increases，andtherateof bending stiffness reduction slowsdown significantly.Comprehensiveanalyses showthatalldouble-mixed fine powderconcretebeams exhibit good flexural fatigue performance， which is worth promoting in engineering.

Key words：high performance concrete；fatigue performance；constant amplitude fatigue test

0 引言

高性能混凝土是采用粉煤灰、磨細礦渣粉等工業(yè)廢料替代混凝土中的一部分水泥，經過特殊技術處理的一種新型高技術混凝土。（剩余8621字）