Shear behavior of pre-damaged RC beams strengthened with UHPFRC-CFRP grid layer

被引：3
|
作者：
Shen, Jiyang [1 ,2 ,3 ]
Dai, Hongzhe [1 ,2 ,3 ]
Zhou, Guangchun [1 ,2 ,3 ]
Shi, Jun [4 ]
机构：
[1] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China
[2] Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin 150090, Peoples R China
[3] Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disaste, Harbin 150090, Peoples R China
[4] Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China
来源：
COMPOSITE STRUCTURES | 2024年 / 349-350卷
基金：
中国国家自然科学基金;
关键词：
RC beam; Coupling action of sustained load and marine; environment; UHPFRC-CFRP grid strengthening layer; Shear behavior; Analytical model; CONCRETE BEAMS; FRP;
D O I：
10.1016/j.compstruct.2024.118520
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Ultra-high performance fiber reinforced concrete (UHPFRC), incorporating recycled tyre fibers, and carbon fiberreinforced polymer (CFRP) grid were utilized to strengthen the pre-damaged reinforced concrete beams caused by coupling action of sustained loads and marine environment. The failure modes, characteristic loads, deflection features, and strain behavior of the strengthened beams with various types of UHPFRC, thicknesses of UHPFRC layers, CFRP grid ratios, and CFRP grid layout angles were investigated. The results indicated that they exhibited the typical shear failure, and their characteristic loads increased by 102 %-205 % compared to the undamaged beam. By increasing the thickness of the UHPFRC layer and the CFRP grid ratio, and adopting 45 degrees CFRP layout angle, the cracking stiffness, energy absorption capacity, and shear force sharing ability would be further improved, while adopting the UHPFRC incorporating recycled tyre fibers would decrease the ductility. Moreover, analytical models were developed to calculate the ultimate loads, manifesting reasonable accuracy.
引用
收藏
页数：14
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