骨料粒徑對模型骨料混凝土剪切性能影響研究

Effect of Aggregate Particle Size on Shear Performance of Modeled Aggregate Concrete

打開文本圖片集

， ，（上海理工大學環(huán)境與建筑學院，上海200093）

中圖分類號：TU528 文獻標志碼：A 文章編號：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

材料科學

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

混凝土結(jié)構(gòu)是現(xiàn)代建筑中主要的結(jié)構(gòu)形式之一，其性能研究始終是推動建筑業(yè)進步的重要因素，混凝土抗剪是混凝土結(jié)構(gòu)基本理論的經(jīng)典問題之一。（剩余11321字）