High rate response of ultra-high-performance fiber-reinforced concretes under direct tension
High rate response of ultra-high-performance fiber-reinforced concretes under direct tension
复制标题
DOI：
10.1016/j.cemconres.2014.12.008
复制
发表时间：
2015-03
影响因子：
11.4
通讯作者：
Ngoc-Thanh Tran;T. Tran;Dong-Joo Kim
中科院分区：
文献类型：
--
作者：
Ngoc-Thanh Tran;T. Tran;Dong-Joo Kim
研究了超高性能纤维混凝土在高应变率（5-24 s-1）下的拉伸响应。在抗压强度为180 MPa的超高性能混凝土（UHPC）中掺加1.5%（体积分数）的捻、长、短光滑钢纤维。采用25 × 25和25 × 50 mm 2两种不同截面的拉伸试件，研究了截面积对UHPFRC拉伸响应的影响。虽然所有三种纤维产生应变硬化行为，即使在高应变速率，长光滑纤维产生最高的抗拉强度在高速率，而扭曲的纤维在静态速率。与光滑钢纤维不同，在高应变率下测试的试样中观察到加捻纤维的断裂。在高应变率下的拉伸行为的UHPFRC的试样尺寸的影响，特别是在开裂后的强度。
The tensile response of ultra-high-performance fiber-reinforced concretes (UHPFRCs) at high strain rates (5–24 s− 1) was investigated. Three types of steel fibers, including twisted, long and short smooth steel fibers, were added by 1.5% volume content in an ultra high performance concrete (UHPC) with a compressive strength of 180 MPa. Two different cross sections, 25 × 25 and 25 × 50 mm2, of tensile specimens were used to investigate the effect of the cross section area on the measured tensile response of UHPFRCs. Although all the three fibers generated strain hardening behavior even at high strain rates, long smooth fibers produced the highest tensile resistance at high rates whereas twisted fiber did at static rate. The breakages of twisted fibers were observed from the specimens tested at high strain rates unlike smooth steel fibers. The tensile behavior of UHPFRCs at high strain rates was clearly influenced by the specimen size, especially in post-cracking strength.