Shear resistance of ultra-high-performance concrete reinforced with hybrid steel fiber subjected to impact loading

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-01-31 DOI:10.31814/STCE.NUCE2019-13(1)-02

Pham Thai Hoan, N. Thuong

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引用次数: 12

Abstract

This study investigated the synergy in shear response of ultra-high-performance fiber-reinforced concrete (UHPFRCs) containing different contents of long and short smooth steel fiber reinforcements at high strain rates. Shear resistance of two ultra-high-performance mono-fiber-reinforced concrete (UHP-MFRCs): L15S00 (containing 1.5 vol.-% long and 0.0 vol.-% short fiber) or L00S15, and one ultra-high-performance hybrid-fiber-reinforced concrete (UHP-HFRCs): L10S05 (containing 1.0 vol.-% long and 0.5 vol.-% short fiber) at high strain rates of up to 272 s-1 was investigated using a new shear test setup by an improved strain energy frame impact machine (I-SEFIM). The L10S05 generated high synergy in shear strength, shear peak toughness at static rate and high synergy in shear strain, shear peak toughness at high strain rates. Moreover, all the investigated UHPFRCs were sensitive to the applied strain rates, especially in term of shear strength. Keywords: UHPFRCs; shear resistance; synergy effect; strain-rate dependent; impact. Received 23 August 2018, Revised 29 September 2018, Accepted 18 December 2018

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冲击荷载作用下混杂钢纤维增强超高性能混凝土抗剪性能研究

本文研究了在高应变速率下，不同光滑长、短钢纤维掺量的超高性能纤维增强混凝土(UHPFRCs)的剪切响应协同效应。利用改进的应变能框架冲击机(I-SEFIM)的新剪切试验装置，研究了两种高性能单纤维增强混凝土(UHP-MFRCs): L15S00(含有1.5 vol.-%长纤维和0.0 vol.-%短纤维)或L00S15和一种高性能混合纤维增强混凝土(UHP-HFRCs): L10S05(含有1.0 vol.-%长纤维和0.5 vol.-%短纤维)在高达272 s-1的高应变率下的抗剪性能。L10S05在静态速率下剪切强度、剪切峰值韧性和高应变速率下剪切应变、剪切峰值韧性具有较高的协同效应。此外，所有研究的UHPFRCs对施加应变速率敏感，特别是在抗剪强度方面。关键词:UHPFRCs;剪切强度;协同效应;应变率依赖;的影响。收稿2018年8月23日，修稿2018年9月29日，收稿2018年12月18日

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Journal of Science and Technology in Civil Engineering (STCE) - NUCE

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