纤维增强高性能混凝土力学性能的数值模拟研究  

Numerical simulation study on mechanical properties of fiber-reinforced high-performance concrete

作　　者：李整建[1] LI Zhengjian(School of Civil and Architectural Engineering,Jiaozuo University,Jiaozuo 454000,China)

机构地区：[1]焦作大学土木建筑工程学院,河南焦作454000

出　　处：《混凝土》2023年第6期109-114,共6页Concrete

摘　　要：在混凝土植入钢纤维网格,结合结构受力特点对钢纤维网格铺设方向进行调整,通过ANSYS软件,对钢纤维增强高性能混凝土力学性能的数值模拟进行了研究,结果表明,在载荷作用下,钢纤维网格轴向应力分布图中,大部分区域所受轴向应力是压应力,在构件的底部中间区域集中有拉应力,拉应力从中间部位向两端逐渐降低。在10.5 k N集中载荷作用下,试件钢纤维加入后,试件各节点位置轴向应力得到有效降低。加入钢纤维可使混凝土试件最大节点轴向应力、底部平均节点轴向应力均降低显著。钢纤维对混凝土构件挠度方向抗变形能力具有显著提高,截面尺寸相同的条件下,钢纤维增强混凝土相较于钢筋混凝土具有更有优良的抗变形能力,能够有效改善混凝土构件的局部抗拉性能。在10.5 k N载荷作用下,90°钢纤维网格混凝各节点在Y轴方向具有最大变形;35°钢纤维网格混凝各节点具有最新变形;65°钢纤维混凝土变形比50°钢纤维网格混凝土微高。The steel fiber is interwoven into a grid laid in concrete,the direction of steel fiber grid laying is adjusted according to the characteristics of structural stress,and the numerical simulation of the mechanical properties of steel fiber reinforced high-performance concrete is studied through ANSYS software,and the results show that under the load,the axial stress in most areas of the axial stress distribution diagram of the steel fiber grid is compressive stress,and the tensile stress is concentrated in the middle area at the bottom of the component,and the tensile stress is gradually reduced from the middle part to both ends.Under the concentrated load of 10.5 kN,the axial stress of each node position of the specimen is effectively reduced after the steel fiber of the specimen is added.The addition of steel fiber can significantly reduce the axial stress of the maximum node and the axial stress of the average node at the bottom of the concrete specimen.Under the same cross-sectional size,steel fiber reinforced concrete has the best performance in terms of tensile and tensile deformation control,and steel fiber improves its local tensile ability significantly.Under the action of 10.5 kN load,each node of 90°steel fiber grid concrete has the maximum deformation in the Y axis direction.Each node of 35°steel fiber grid coagulation has the latest deformation.The deformation of 65°steel fiber concrete is slightly higher than that of 50°steel fiber grid concrete.

关 键 词：钢纤维 数值模拟 混凝土 网格 力学性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]