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弯曲作用下超高性能混凝土梁延性和抗弯韧性的试验研究

An Experimental Study on the Ductility and Flexural Toughness of Ultrahigh-Performance Concrete Beams Subjected to Bending.

作者信息

Yang In-Hwan, Park Jihun, Bui The Quang, Kim Kyoung-Chul, Joh Changbin, Lee Hyungbae

机构信息

Department of Civil Engineering, Kunsan National University, Kunsan, Jeonbuk 54150, Korea.

Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, Goyang, Gyeonggi 10223, Korea.

出版信息

Materials (Basel). 2020 May 12;13(10):2225. doi: 10.3390/ma13102225.

DOI:10.3390/ma13102225
PMID:32408664
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7288179/
Abstract

Ultrahigh-performance concrete (UHPC) and high-strength concrete (HSC) are currently widely used because of their distinct superior properties. Thus, a comprehensive comparison of the flexural behavior of UHPC and HSC beams is presented in this study. Nine UHPC beams and three HSC beams were subjected to pure bending tests to investigate the effect of various reinforcement ratios and steel fiber volume contents on the cracking and failure patterns, load-deflection behavior, ductility, and flexural toughness of these beams. The addition of steel fibers in the UHPC improved the energy absorption capacity of the beams, causing the UHPC beams to fail via rebar fracture. The deflection and curvature ductility indices were determined and compared in this study. The ductility indices of the HSC beam tended to decrease sharply as the rebar ratio increased, whereas those of the UHPC beam did not show a clear trend with respect to the rebar ratio. In addition, a comparison between the results in this study and the results from previous studies was performed. In this study, the addition of steel fiber contents up to 1.5% in UHPC increased the load capacity, ductility, and flexural toughness of the UHPC beams, whereas the addition of a steel fiber content of 2.0% did not significantly increase the ductility or flexural toughness of the UHPC beams.

摘要

超高性能混凝土（UHPC）和高强度混凝土（HSC）由于其明显的优越性能，目前被广泛应用。因此，本研究对UHPC梁和HSC梁的弯曲性能进行了全面比较。对9根UHPC梁和3根HSC梁进行了纯弯曲试验，以研究不同配筋率和钢纤维体积含量对这些梁的开裂和破坏模式、荷载-挠度行为、延性和弯曲韧性的影响。在UHPC中添加钢纤维提高了梁的能量吸收能力，导致UHPC梁因钢筋断裂而破坏。本研究测定并比较了挠度和曲率延性指标。HSC梁的延性指标随着配筋率的增加而急剧下降，而UHPC梁的延性指标在配筋率方面没有明显趋势。此外，还对本研究结果与以往研究结果进行了比较。在本研究中，在UHPC中添加高达1.5%的钢纤维含量可提高UHPC梁的承载能力、延性和弯曲韧性，而添加2.0%的钢纤维含量并未显著提高UHPC梁的延性或弯曲韧性。

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