混杂纤维增强RAC梁抗剪性能有限元分析

摘要

以一根普通混凝土梁、取代率为50%的再生混凝土梁和含量为0.3%的混杂纤维的增强型再生混凝土梁为试验,通过3组15块标准试件测得各个混凝土的基本性能,采用有限元软件ABAQUS对三根无腹筋简支梁进行抗剪性能模拟分析,并对相应的挠度、箍筋应变曲线和极限抗剪承载力指标进行对比.分析表明:模拟出的梁极限受剪承载力与试验值偏差较小,取代率和混杂纤维的掺入使梁在塑形阶段力学性能差于普通混凝土梁,受剪区的混凝土提前发生开裂、箍筋更早的受剪,对斜截面无腹筋受剪梁抗剪作用较小.%It had studied the basic properties of a ordinary concrete beam and a RAC beam with 50% replacement ratio and a EC-RAC beam which contains 0.3% hybrid fiber respectively by 3 groups of 15 standard specimens,and three simply supported beams under shear-ing without web reinforcement was stimulated by finite element analysis software ABAQUS to compare the deflection、stirrup strain curves and ultimate shear capacity index correspondingly.The analysis shows that beam ultimate shear capacity is closer to test results,at the same time,with the influences of 50% replacement ratio and hybrid fibers,the mechanical properties of beams were worse than ordinary con-crete beam in the plastic state,which cracking concrete ahead of time in inclined section and shearing stirrup earlier and providing less ef-fect to beams without web reinforcement in inclined section under shearing.