骨料粒径对模型骨料混凝土剪切性能影响研究
Effect of Aggregate Particle Size on Shear Performance of Modeled Aggregate Concrete
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， ，（上海理工大学环境与建筑学院，上海200093）
中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）01-0007-07
DOI：10.19860/j.cnki.issn1005-8249.2025.01.002
WANG Zhixin， SUN Chang，LIU Qiong(School of Environment and Architecture， University of Shanghai for Scienceand Technology， Shanghai 2O0093，China）
Abstract：Through sheartestsonmodeledaggegateconcrete specimens with three distinctaggegate particle sizesof17，23， and30mm，this studyinvestigatestheinfluenceof agregateparticlesizeontheshear performanceandcrack development behaviorof modeled aggregateconcrete.The studyclarifiesthesheartransfer mechanism in modeledagregateconcreteand analyzes diferentaggegateparticlesizesafectconcrete'sshearperformance.According totheresults，astheaggregatesize increases from 17 mm to 3Omm，the peak load increases graduallyand the growth rate decreases gradually.Corrspondingly， theshearslipatpeak loadalsoincreases，withitsgrowthrateacelerating.TheLoad-displacementcurvesforspecimens with thethreeagregateparticlesizesshowapproximatelythre stages：an initialrise，folowed byadecline，andtheneithera secondaryriseorstabilization.Thefractureconditionoftheaggegateinfluencesthetrendofcrack width-slipcurves. Specimens with diffrentagregateparticle sizesdisplaydistinctcharacteristicsintermsofaggregatefractureand crack propagation，with strainconcentrationareascorrelating closelywithaggregate fracturepaterns.Specifically，smalerparticles tendto fracture，leading tomechanicalinterlockandfriction betweencracks totransfershearforces；largerparticlesremain
材料科学
intact，relyingonmechanicalinterlockandfrictionbetweentheaggregateandmortartotransfershearforces；medium-sized particles exhibit transitional failure modes.Overall，specimenswith varyingparticlesizes demonstratedistinctshearforce transfer characteristics.
Key words：modeled aggregate concrete；aggregate particle；crack propagation； shear performance
0 引言
混凝土结构是现代建筑中主要的结构形式之一，其性能研究始终是推动建筑业进步的重要因素，混凝土抗剪是混凝土结构基本理论的经典问题之一。（剩余11321字）