FRP筋异强混凝土叠浇梁挠度与延性研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2739-2747.

FRP筋异强混凝土叠浇梁挠度与延性研究

张建波, 陈升平, 卢应发

湖北工业大学土木建筑与环境学院,武汉 430068

收稿日期:2022-03-31 修回日期:2022-05-12 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 陈升平,教授。E-mail:786064697@qq.com
作者简介:张建波(1993—),男,硕士研究生。主要从事FRP筋纤维混凝土结构研究。E-mail:3029526860@qq.com
基金资助:
国家自然科学基金(42071264,41641027);三峡后续工作地质灾害防治项目(0001212015CC60005)

Deflection and Ductility of FRP Bars Reinforced Concrete Superposed Beams

ZHANG Jianbo, CHEN Shengping, LU Yingfa

School of Civil Architecture and Environment, Hubei University of Technology, Wuhan 430068, China

Received:2022-03-31 Revised:2022-05-12 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 为提高纤维增强聚合物(FRP)筋异强混凝土叠浇梁的抗弯性能与延性,研究了钢纤维掺量、钢纤维混凝土叠浇层厚度对FRP筋异强混凝土叠浇梁的影响。以钢纤维体积掺量(0%、0.5%、1.0%、1.5%)与钢纤维混凝土叠浇层厚度(0 mm、180 mm、210 mm、300 mm)为变量,对6根FRP筋异强混凝土叠浇梁进行三分点弯曲试验,并对试验梁的破坏过程、破坏形态、裂缝宽度以及跨中挠度进行分析。研究结果表明:钢纤维的掺入改善了FRP筋异强混凝土叠浇梁的受力性能,使其由脆性破坏向延性破坏发展;随着钢纤维掺量、钢纤维混凝土叠浇层厚度的增加,FRP筋异强混凝土叠浇梁的极限承载力提高了9%~33%,抗弯性能提升了4%~21%,延性提升了22%~89%。基于试验与理论分析,建立了钢纤维作用下的FRP筋异强混凝土叠浇梁挠度计算公式与延性评价方法。

关键词: FRP筋, 钢纤维混凝土, 叠浇梁, 挠度, 裂缝宽度, 延性

Abstract: In order to improve the flexural behavior and ductility of fiber reinforced polymer (FRP) bars reinforced concrete superposed beams, the effects of steel fiber content and thickness of steel fiber reinforced concrete superposed layer on the FRP bars reinforced concrete beams were studied. The volume content of steel fiber (0%, 0.5%, 1.0%, 1.5%) and thickness of steel fiber reinforced concrete superposed layer (0 mm, 180 mm, 210 mm, 300 mm) were taken as variables. The failure process, failure mode, crack width and mid-span deflection of six FRP bars reinforced concrete superposed beams were analyzed by three-point loading test. The results show that the addition of steel fiber improves the mechanical properties of tested beams and makes failure mode of tested beams develop from brittle failure to ductile failure. With the increase of the ratio of steel fiber and thickness of steel fiber reinforced concrete superposed layer, the ultimate bearing capacity, flexural resistance and ductility evaluation index of FRP bars reinforced concrete superposed beams increase by 9%~33%, 4%~18% and 22%~89%, respectively. Based on the experimental and theoretical analysis, the deflection calculation formula and ductility evaluation method of the FRP bars reinforced concrete superposed beams on the factor of steel fiber are established.

Key words: FRP bar, steel fiber concrete, superposed beam, deflection, crack width, ductility

中图分类号:

TU528.44

张建波, 陈升平, 卢应发. FRP筋异强混凝土叠浇梁挠度与延性研究[J]. 硅酸盐通报, 2022, 41(8): 2739-2747.

ZHANG Jianbo, CHEN Shengping, LU Yingfa. Deflection and Ductility of FRP Bars Reinforced Concrete Superposed Beams[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2739-2747.

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