Flexural behaviour of damaged concrete T-beams reinforced with ultra-high performance concrete filling

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Shuai Huang, Yonglei Xi, Xin Li, Pengfei Men, Gangan Wu
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引用次数: 0

Abstract

To improve the flexural performance of damaged reinforced concrete T-beams, a method of filling ultra-high performance concrete (UHPC) in the damaged area was adopted. Experimental studies were conducted on two UHPC-reinforced concrete T-beams with different lengths of damaged areas and one undamaged concrete T-beam as a reference. Crack distribution, failure modes, cracking loads, flexural capacities, and strain variation of the specimens were analyzed. Subsequently, a nonlinear finite element (FE) model of the UHPC-reinforced T-beam was developed using ABAQUS, and the FE model results were compared with the experimental results to validate the accuracy of the FE simulation method. The results indicated that the two UHPC-reinforced T-beams exhibited a similar flexural failure process to the undamaged T-beam. The longitudinal tensile strain distribution at the mid-span section showed that the composite section formed by the filling of UHPC in the damaged region still adhered the assumption of the planar section. Owing to the excellent bond performance between UHPC and the existing concrete, the main cracks of the UHPC-reinforced T-beams appeared in the chiseled area, and the crack widths of the UHPC-reinforced T-beams under the same load were smaller than those of the reference T-beam. Overall, the reinforcing method of filling UHPC in the damaged region can restore or even enhance the flexural performance of the damaged reinforced concrete T-beams.
使用超高性能混凝土填充物加固的受损混凝土 T 型梁的挠曲性能
为改善受损钢筋混凝土 T 型梁的抗弯性能,采用了在受损区域填充超高性能混凝土(UHPC)的方法。实验研究以两根损坏区域长度不同的 UHPC 加固混凝土 T 型梁和一根未损坏的混凝土 T 型梁为参照物。对试样的裂缝分布、破坏模式、开裂荷载、抗弯能力和应变变化进行了分析。随后,使用 ABAQUS 建立了超高性能混凝土加固 T 型梁的非线性有限元(FE)模型,并将 FE 模型结果与实验结果进行比较,以验证 FE 模拟方法的准确性。结果表明,两根 UHPC 加固 T 型梁表现出与未损坏 T 型梁相似的弯曲破坏过程。中跨截面的纵向拉伸应变分布表明,在受损区域填充 UHPC 后形成的复合截面仍符合平面截面的假设。由于 UHPC 与原有混凝土的粘结性能良好,UHPC 加固 T 梁的主要裂缝出现在凿毛区域,且在相同荷载下 UHPC 加固 T 梁的裂缝宽度小于基准 T 梁。总之,在受损区域填充 UHPC 的加固方法可以恢复甚至提高受损钢筋混凝土 T 梁的抗弯性能。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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