超高性能混凝土（UHPC）凭借其优异的力学性能、耐久性和环保特性，在梁式构件领域展现出巨大的应用潜力。然而，高昂的材料成本使UHPC结构常被误认为性价比偏低，这一认知误区严重制约了其工程化推广进程。现有研究大多聚焦于UHPC构件的力学性能优化，却鲜有针对其抗弯性价比的系统性评价。为此，该文构建了一套梁式构件抗弯性价比评价体系，以期为UHPC结构的合理设计与工程应用提供理论支撑。首先，以“性能”和“代价”为核心，构建了抗弯性价比评价指标；接着，选取极限弯矩表征构件抗弯性能，以纯弯段单位长度材料成本表征经济代价，据此建立量化的性价比指标；然后，采用经典参照法，以传统单筋矩形适筋梁为参照对象，通过极差标准化法对性价比指标进行无量纲化处理；在此基础上，结合概率论与K均值聚类算法，在保障科学性与客观性的前提下，完成抗弯性价比的等级划分；最后，运用该评价体系对比分析了常规梁式构件和UHPC梁式构件的抗弯性价比差异。研究结果表明：钢筋混凝土梁的抗弯性价比与梁截面宽度无关，而与梁截面高度及材料强度等级呈正相关；在构件设计时，应优先选用高强度混凝土与高强度钢筋的组合方案，同时可考虑采用预应力钢绞线替代受拉钢筋。此外，若直接采用UHPC简单替代普通混凝土来研发新型构件，其抗弯性价比不占优势；唯有针对UHPC和其他建筑材料的力学特点进行针对性设计，方可获得抗弯性价比较高的构件形式。

Ultra-high performance concrete (UHPC) has demonstrated significant application potential in beam components due to its excellent mechanical properties, durability, and environmental friendliness. However, the high material cost often leads to the misconception that UHPC structures offer low cost-effectiveness, which hinders their widespread engineering adoption. Existing studies mostly focus on optimizing the mechanical properties of UHPC components, but there is a notable lack of systematic evaluation regarding their flexural cost performance ratio. To address this gap, this paper established a comprehensive evaluation system for the flexural cost performance ratio of beam components, aiming to provide theoretical support for the rational design and engineering application of UHPC structures. Firstly, with “performance” and “cost” as the core considerations, an evaluation indicator for flexural cost performance ratio was constructed. Subsequently, the ultimate bending moment was selected to characterize the flexural performance of components, while the material cost per unit length of the pure bending segment was used to represent economic cost. Based on these, a quantifiable cost performance ratio indicator was established. Subsequently, the classic reference method was employed, taking conventional single-reinforcement rectangular beams with appropriate reinforcement as the reference benchmark. The cost performance ratio indicator was then rendered dimensionless throgh the range standardization method. On this basis, integreating probability theory and the K-means clustering algorithm, a grading system for flexural cost performance ratio was established, ensuring both scientific rigor and objectivity. Finally, the evaluation system was applied to comparatively analyze the differences in flexural cost performance ratio between conventional beam members and UHPC beam members. The research results show that the flexural cost performance ratio of reinforced concrete beams is independent of beam width but exhibits a positive correlation with both beam depth and material strength grade. In component design, priority should be given to combinations of higher-strength concrete and highe-strength steel reinforcement, and the substitution of tensile reinforcement with prestressed steel strands can also be considered. Furthermore, if UHPC is simplely used as a direct replacement for ordinary concrete in developing new components, it does not demonstrate an advantage in flexural cost performance ratio. Only through tailored designs that leverage the mechanical characteristics of UHPC and other construction materials can component forms with a high flexural cost performance ratio be achieved.