钢-ECC-UHPC叠合板组合梁抗弯性能分析

Flexural Performance Analysis of Steel-ECC-UHPC Composite Slab Composite Beams

摘要: 为提升钢–混组合梁的抗弯力学性能，改善主梁开裂、耐久性不足等问题，将工程水泥基复合材料(ECC)及超高性能混凝土材料(UHPC)引入到钢–混组合梁中，并基于ABAQUS展开了钢-ECC-UHPC叠合板组合梁缩尺模型仿真分析，探究了桥面板厚度和配筋率对其抗弯性能的影响。结果表明：试件呈现以钢梁屈曲失效为主导的延性破坏模式，变形集中于跨中加固区两侧，而ECC-UHPC叠合板协同工作性能优异，有效延缓了桥面板应力集中。增大桥面板厚度可提升组合梁抗弯性能，当厚度由80 mm增至100 mm时，屈服荷载与极限承载力分别提高4.2%和3.9%；提高配筋率同样效果显著，当配筋率由1.18%增至3.27%时，屈服荷载与极限荷载分别提升10.3%和15.8%。

Abstract: To improve the flexural mechanical performance of steel-concrete composite beams and address issues such as cracking and insufficient durability of the main beam, engineered cementitious composite (ECC) and ultra-high performance concrete (UHPC) were introduced into steel-concrete composite beams. A scaled model simulation of a steel-ECC-UHPC composite slab composite beam was conducted using ABAQUS to investigate the effects of slab thickness and reinforcement ratio on its flexural performance. The results show that the specimen exhibits a ductile failure mode dominated by buckling failure of the steel beam, with deformation concentrated on both sides of the mid-span reinforcement zone. The ECC-UHPC composite slab demonstrates excellent collaborative performance, effectively delaying stress concentration in the slab. Increasing the slab thickness enhances the flexural performance of the composite beam. When the thickness increases from 80 mm to 100 mm, the yield load and ultimate bearing capacity increase by 4.2% and 3.9%, respectively. Increasing the reinforcement ratio also significantly improves flexural performance. When the reinforcement ratio increases from 1.18% to 3.27%, the yield load and ultimate load increase by 10.3% and 15.8%, respectively.