Experimental and Analytical Investigation of Deflection of R-UHPFRC Beams Subjected to Loading–Unloading

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-01-19 DOI:10.1186/s40069-023-00636-x
Bartłomiej Sawicki, Eugen Brühwiler
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Abstract

Under service conditions, R-UHPFRC (Reinforced Ultra High Performance Fiber Reinforced Cementitious composite) beams exhibit residual deflection after loading–unloading. This is due to the tensile strain hardening behavior of UHPFRC. The precise calculation of deflection is thus relevant and was not addressed previously. This paper proposes a material model for UHPFRC under loading–unloading and a numerical layered model for the calculation of stress and strain distribution in the cross section. Then, a curvature-based analytical model is presented for calculation of deflection of a beam. This method is finally compared and validated against experimental results as obtained from four-point bending of full-scale R-UHPFRC beams. This research reveals the need for a specific material model for UHPFRC subjected to loading–unloading for the precise calculation of the structural response of elements and members under repetitive loading, such as service or fatigue loading.

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加载-卸载条件下 R-UHPFRC 梁挠度的实验和分析研究
在使用条件下,R-UHPFRC(超高性能纤维增强水泥基复合材料)梁在加载-卸载后会出现残余挠度。这是由于 UHPFRC 的拉伸应变硬化行为造成的。因此,挠度的精确计算具有现实意义,但之前并未涉及。本文提出了加载-卸载条件下 UHPFRC 的材料模型,以及用于计算横截面应力和应变分布的数值分层模型。然后,提出了一个基于曲率的分析模型,用于计算梁的挠度。最后,将该方法与全尺寸 R-UHPFRC 梁的四点弯曲实验结果进行比较和验证。这项研究表明,需要为承受加载-卸载的 UHPFRC 建立特定的材料模型,以精确计算重复加载(如使用或疲劳加载)下的构件和部件的结构响应。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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