圍壓作用下再生混凝土細(xì)觀數(shù)值模擬研究

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WANG ，WU Yamin2

（1. Ji'nan East Rail Transit Building Materials Co.，Ltd.，Ji'nan 25OOOO，China； 2. School of Architectural Engineering， Zhengzhou University of Industrial Technology， Xinzheng 451100，China）

Abstract：To perform a microscale analysis onrecycled concrete under high confinement presure，an improved concrete damage plasticity model wasapliedto finiteelement software.Afive-phase randomaggegate modelwasestablished using Pythontoinvestigatethe stress-straincurveand damagefailure morphologyofconcreteunder3，15，and24 MPaconfinement presures withdiferentreplacementrates ofrecycledcoarseagregates.Theresultsshowthattheaccuracyofthis material model is muchhigherthanthatoftraditional models，andits stress-straincurvedevelopment rendandresultsarebasicallythesame as the experimental values，with a maximum difference of no more than 10% ；This method can effectively simulate the mechanical properties ofconcrete under confinement pressure，when the confinement pressreis low，therearemorefailure cracksintheconcrete.Whentheconfinementpressureis high，thereare moreinitial cracksintheconcrete，butultimately only one failure crack will form.

Keywords：recycled concrete；；confining pressre；mesoscopic finite element； concrete damage plasticity model

0 引言

再生混凝土是一種將廢棄混凝土經(jīng)過破碎后再利用的環(huán)保型混凝土，近年來在建筑領(lǐng)域得到廣泛的應(yīng)用。（剩余5661字）