摘   要：基于ABAQUS软件中的损伤模型，建立了玻璃纤维增强聚合物（GFRP）筋超高性能混凝土（UHPC）梁的受弯性能有限元模型，研究了UHPC抗压强度、GFRP筋配筋率、GFRP筋极限拉应变、GFRP筋和钢筋混合配筋、GFRP-钢筋复合筋对试件受弯性能的影响，并建立了平衡配筋率计算公式。结果表明：随着UHPC抗压强度的增大，试件的刚度变化有限，极限承载力显著增大；随着GFRP筋配筋率的增大，试件的刚度、极限承载力和跨中最大挠度均增大；随着GFRP筋极限拉应变的增大，试件的极限承载力和跨中最大挠度增大；混合配筋时，随着GFRP筋配筋面积的增加，试件的极限承载力和跨中最大挠度增大；与纯GFRP筋试件相比，GFRP-钢筋复合筋试件有明显的屈服阶段，荷载-跨中挠度曲线呈“三折线”特征；建立的平衡配筋率计算公式的准确度较高。 Abstract: Based on the damage model in ABAQUS software, a finite element model of the bending performance of ultra-high performance concrete(UHPC) beams with glass fiber reinforced polymer (GFRP) bars was established. The compressive strength of UHPC, the reinforcement ratio of GFRP bars, the ultimate tensile strain of GFRP bars, the mixed reinforcement of GFRP bars and steel bars, and the composite reinforcement of GFRP bars and steel bars on the bending performance of the specimens were studied, and a formula for calculating the balanced reinforcement ratio was established. The results show that as the compressive strength of UHPC increases, the stiffness change of the specimen is limited, and the ultimate bearing capacity significantly increases. As the reinforcement ratio of GFRP bars increases, the stiffness, ultimate bearing capacity, and maximum mid-span deflection of the specimen increase. As the ultimate tensile strain of GFRP bars increases, the ultimate bearing capacity and maximum mid-span deflection of the the specimen increase. When mixed reinforcement is used, as the area of GFRP bars increases, the ultimate bearing capacity and maximum mid-span deflection of the specimen increase. Compared with the specimen with pure GFRP bars, the specimen with composite reinforcement of GFRP bars and steel bars has a distinct yield stage, and the load-mid-span deflection curves exhibits a "trilinear" characteristic. The established formula for calculating the balanced reinforcement ratio has high accuracy.

王彦朋,张恒,聂晓梅,等.GFRP筋超高性能混凝土梁受弯性能有限元分析[J].混凝土与水泥制品,2025(2):63-69. WANG Y P,ZHANG H,NIE X M,et al.Finite element analysis of bending behavior of ultra-high performance concrete beams with GFRP bars[J].China Concrete and Cement Products,2025(2):63-69.

摘   要：对比研究了配置HRB600纵筋的UHPC梁构件和配置HRB400纵筋的C40混凝土梁构件的抗剪性能。结果表明：采用UHPC和HRB600高强钢筋相结合有效提升了混凝土梁的抗裂性能、抗剪承载力和变形性能，推迟了弯曲裂缝的出现；当剪跨比为1.0、1.5、2.0时，与配置HRB400纵筋的C40混凝土梁构件相比，配置HRB600纵筋的UHPC梁构件的极限承载力Pu分别提高了147%、122%、103%，Pu对应的跨中挠度δu分别提高了22.5%、83.2%、145.0%；配置HRB600纵筋的UHPC梁构件的斜截面抗剪承载力受多因素影响，需对此进行深入研究。 Abstract: A comparative study was conducted on the shear performance of UHPC beam components with HRB600 longitudinal steel bars and C40 concrete beam components with HRB400 longitudinal steel bars. The results show that the combination of UHPC and HRB600 high-strength steel bars effectively improves the crack resistance, shear bearing capacity, and deformation performance of concrete beams, and delays the occurrence of bending cracks. When the shear span ratio is 1.0, 1.5, and 2.0, compared with the C40 concrete beam component with HRB400 longitudinal steel bars, the ultimate bearing capacity Pu of the UHPC beam component with HRB600 longitudinal steel bars is increased by 147%, 122%, and 103%, respectively. The corresponding mid-span deflection δu of Pu is increased by 22.5%, 83.2%, and 145.0%, respectively. The inclined section shear bearing capacity of UHPC beam components with HRB600 longitudinal steel bars is influenced by multiple factors and requires in-depth research.

胡利,李映春,黎平杰,等.高强钢筋超高性能混凝土梁抗剪性能试验研究[J].混凝土与水泥制品,2025(2):70-75. HU L,LI Y C,LI P J,et al.Experimental study on shear performance of reinforced ultra-high performance concrete beams[J].China Concrete and Cement Products,2025(2):70-75.