BFRP筋-再生轮胎钢纤维增强混凝土梁的抗弯性能

Flexural Behavior of BFRP Bar-Recycled Tire Steel Fiber-Reinforced Concrete Beams.

作者信息

Fu Jing-Hua, Zhang Ao, Chen Kai-Feng, Li Bao-Yuan, Wu Wei

机构信息

National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, China.

China Construction Yipin Investment Development Co., Ltd., Wuhan 430000, China.

出版信息

Materials (Basel). 2024 Dec 18;17(24):6197. doi: 10.3390/ma17246197.

DOI:10.3390/ma17246197

PMID:39769798

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11677358/

Abstract

This research advocates for the use of basalt fiber-reinforced polymer (BFRP) bars and recycled tire steel fibers to reinforce concrete beams. Six concrete beams were constructed using different volume contents of recycled tire steel fibers (0, 0.5%, 1.0%, 1.5%) and BFRP reinforcement ratios (0.48%, 0.75%, 1.08%). Mechanical properties tests were conducted to investigate the flexural characteristics and failure modes of beams utilizing the non-contact full-field strain displacement measuring technology-digital image (3D-DIC) technology. The recycled tire steel fiber (RTSF) improves flexural performance, which contributes to inhibiting crack propagation, reducing flexural deformation, and improving the first cracking and ultimate loading capacities. Under the same reinforcement ratio, in comparison to ordinary BFRP beams, the cracking load of BFRP-RTSF beams increased by 17.73%, 23.76%, and 42.94%, respectively, and the ultimate bearing capacity increased by 4.03%, 5.85%, and 13.21%, respectively. In addition, a modified calculation model of bearing capacity considering RTSF tensile strength is proposed. The predicted values of BFRP-RTSF beams match well with the experimental values.

摘要

本研究提倡使用玄武岩纤维增强聚合物（BFRP）筋和废旧轮胎钢纤维来增强混凝土梁。使用不同体积含量的废旧轮胎钢纤维（0、0.5%、1.0%、1.5%）和BFRP配筋率（0.48%、0.75%、1.08%）构建了六根混凝土梁。利用非接触全场应变位移测量技术——数字图像（3D-DIC）技术进行力学性能试验，以研究梁的弯曲特性和破坏模式。废旧轮胎钢纤维（RTSF）改善了弯曲性能，有助于抑制裂缝扩展、减少弯曲变形并提高初裂和极限承载能力。在相同配筋率下，与普通BFRP梁相比，BFRP-RTSF梁的开裂荷载分别提高了17.73%、23.76%和42.94%，极限承载力分别提高了4.03%、5.85%和13.21%。此外，提出了考虑RTSF抗拉强度的修正承载力计算模型。BFRP-RTSF梁的预测值与试验值吻合良好。