混杂纤维对全沙漠砂混凝土基本力学性能的影响  

Effect of mixed fibers on the basic mechanical properties of full desert sand concrete

作　　者：马义傲 李铮翔 唐艳娟[1] 夏多田[1,2] MA Yiao;LI Zhengxiang;TANG Yanjuan;XIA Duotian(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi,Xinjiang 832003,China;Xinjiang Production&Construction Groups Engineering Laboratory for Seismic and Energy-Saving Building in High Earthquake Intensity and Cold Zone,Shihezi,Xinjiang 832003,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]新疆兵团高烈度寒区建筑抗震节能技术工程实验室,新疆石河子832003

出　　处：《石河子大学学报（自然科学版）》2024年第2期174-183,共10页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(52168026)。

摘　　要：为研究混杂纤维对全沙漠砂混凝土力学性能的影响,将聚乙烯醇纤维(PVA)、聚丙烯纤维(PP)以不同比例混合后掺入全沙漠砂混凝土中进行了抗压、抗折等试验,同时建立了材料单轴压缩应力-应变本构模型,并采用ABAQUS软件进行数值模拟验证。研究结果表明:在混杂纤维总体积掺量为1.5%的条件下,试件抗压强度无显著变化,随着PVA纤维比例提高,试件抗折强度、拉伸强度及拉伸峰值应变明显提高;较于普通全沙漠砂混凝土,混杂纤维全沙漠砂混凝土峰值应力与弹性模量略微降低,变形能力提升显著;PP纤维和PVA纤维掺量分别为0.5%、1.0%时具有最优的混杂效应,与普通全沙漠砂混凝土相比,抗折强度、单轴拉伸强度和延性分别提高了77%、55%、16%;基于过镇海模型提出的轴压应力-应变本构模型与试验实测曲线拟合程度较好,并与ABAQUS软件的数值模拟验证结果相似。In order to study the effect of mixed fibres on the mechanical properties of all-desert sand concrete,polyvinyl alcohol fibres(PVA fibres)and polypropylene fibres(PP fibres)were mixed in different proportions and then blended into the all-desert sand concrete to conduct the tests of compression and flexural resistance,and the uniaxial compressive stress-strain constitutive model of the material was also established,and numerical simulation was carried out using ABAQUS software for verification.The results show that:under the condition that the total volume of mixed fiber mixing is 1.5%,there is no significant change in the compressive strength of the specimen,with the increase of the proportion of PVA fibers,the flexural strength,tensile strength and tensile peak strain of the specimen increased significantly;compared with the ordinary all-desert sand concrete,the peak stress and modulus of elasticity of the mixed-fiber all-desert sand concrete are slightly reduced,and deformation capacity is significantly improved;PP fiber and PVA fiber dosage of 0.5%and 1.0%respectively have the optimal mixing effect,compared with ordinary all-desert sand concrete,the flexural strength,uniaxialtensile strength and ductility were improved by 77%,55%and 16%,respectively;the axial compressive stress-strain constitutive model based on the Guo Zhenhai model fits well with the experimental measured curves and is similar to the results verified with numerical simulation of ABAQUS software.

关 键 词：全沙漠砂混凝土 聚乙烯醇纤维 聚丙烯纤维 力学性能 本构模型 

分 类 号：TU528[建筑科学—建筑技术科学]