Twelve ECC beams with three different fiber types, along with four normal concrete beams, were tested in this study to evaluate the influence of cross-sectional hollowing on their flexural performance. The fiber types used were nylon monofilament (NM), low-cost untreated polyvinyl alcohol (PVA), and polypropylene (PP). Three different square hole sizes of 60, 80, and 100 mm with cross-sectional hollowing ratios of 0.16, 0.28, and 0.44, respectively, were adopted for each group of beams in addition to a solid beam. All beams were tested under four-point loading using a displacement-controlled testing machine. The test results showed that ECC beams can mostly withstand higher cracking and ultimate loads compared to their corresponding normal concrete versions. The results also showed that both the ductility and toughness of the ECC beams are higher than those of the normal concrete beams and that the ductility values of the hollow beams with a hole size of 60 mm are higher than those of the corresponding solid beams. Moreover, hollow ECC beams with hole sizes of 60 and 80 mm exhibited a higher ductility than a solid normal concrete beam.

在这项研究中测试了十二种具有三种不同纤维类型的ECC梁以及四种普通混凝土梁，以评估截面空心对弯曲性能的影响。使用的纤维类型为尼龙单丝（NM），低成本未处理的聚乙烯醇（PVA）和聚丙烯（PP）。除实心梁外，每组梁还分别采用了三种不同的方孔尺寸，分别为60、80和100 mm，截面空心率分别为0.16、0.28和0.44。使用位移控制的测试机在四点载荷下测试所有梁。测试结果表明，与相应的普通混凝土版本相比，ECC梁几乎可以承受更高的开裂和极限载荷。结果还表明，ECC梁的延性和韧性均高于普通混凝土梁，孔尺寸为60 mm的空心梁的延性值高于相应的实心梁。此外，孔尺寸为60和80 mm的空心ECC梁比实心普通混凝土梁具有更高的延展性。