为了研究钢-聚乙烯醇（polyvinyl alcohol, PVA）混杂纤维对高性能混凝土（high performance concrete, HPC）的增强增韧效果，以钢纤维体积分数、PVA纤维体积分数和矿粉掺量为三因素，采用正交试验，设计并制作16组试件，进行四点加载和三点加载弯曲试验，获取了荷载（P）-跨中挠度（δ）曲线和荷载（P）-裂缝张口位移（crack mouth opening displacement, CMOD）曲线,测定了28 d龄期后的弯曲韧性和断裂性能等。研究表明：混凝土中掺入钢纤维或PVA纤维，P-δ 曲线和P-CMOD曲线都变得更加饱满，对其有较为明显的增强增韧效果；特别是当两种纤维和一定量的矿粉掺入混凝土中，曲线下降段趋势变得更加平缓，混掺纤维高性能混凝土试件比单掺纤维混凝土试件具有更好的变形能力，掺入1.5%的钢纤维、0.2%的PVA纤维和20%的矿粉的效果最佳，对弯曲韧性和断裂性能的提升最为显著，具有不错的正混杂效应。

In order to study the strengthening and toughening effect of steel-PVA (polyvinyl alcohol) blended fibers on HPC (high performance concrete), 16 sets of specimens were designed and fabricated by using steel fiber volume fraction, PVA fiber volume fraction and mineral powder dosing as triple factors, and four-point loading and three-point loading bending tests were conducted to obtain load (P) -mid-span deflection (δ) curves and load (P) -CMOD (crack mouth opening displacement) curves, the flexural toughness and fracture properties after 28 days of age were determined. The study shows that: the P-δ curve and P-CMOD curve become more full when the concrete is mixed with steel fiber or PVA fiber, which has a more obvious enhancement and toughening effect; especially when the 2 fibers and a certain amount of mineral powder are mixed into the concrete, the trend of the falling section of the curve becomes more gentle, and the mixed fiber high performance concrete specimens have better deformation ability than the single fiber concrete specimens, mixed with 1.5% of steel fiber, 0.2% of PVA fiber and 20% of mineral powder has the best effect, the most significant improvement of bending toughness and fracture performance, with a good positive mixing effect.