Experimental investigation on the moment-rotation performance of pultruded FRP web-flange junctions

被引：7
|
作者：
Cintra, Gisele G. [1 ]
Cardoso, Daniel C. T. [1 ]
Vieira, Janine D. [2 ]
Keller, Thomas [3 ]
机构：
[1] Pontifical Catholic Univ Rio de Janeiro PUC Rio, Dept Civil & Environm Engn, Rua Marques de Sao Vicente 225, BR-22451900 Rio De Janeiro, RJ, Brazil
[2] Fluminense Fed Univ UFF, Dept Civil Engn, Rua Passo da Patria 156, BR-24210240 Niteroi, RJ, Brazil
[3] Ecole Polytech Fed Lausanne EPFL, Composite Construct Lab CCLab, BP 2225,Stn 16, CH-1015 Lausanne, Switzerland
来源：
COMPOSITES PART B-ENGINEERING | 2021年 / 222卷
关键词：
Pultrusion; Glass fibers; Defects; Analytical modelling; MECHANICAL-BEHAVIOR; STIFFNESS; STRENGTH; FAILURE; MEMBERS;
D O I：
10.1016/j.compositesb.2021.109087
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper aims to present an experimental investigation on the behavior of web-flange junctions (WFJs) rotational stiffness of pultruded fiber-reinforced polymer composites (FRP). Channels and I-sections were tested using a simple set-up, which was developed in order to experimentally characterize the junctions in a direct manner. The Digital Image Correlation (DIC) technique was used, allowing overall deflections and relative rotations between web and flange to be monitored. The WFJs' imperfections were analyzed through an optical microscope and correlated with the cracks' formation. Further, damage thresholds are identified using available stress equations for curved composite members and lower bound functions are proposed to simulate the junction stiffness retention. Finally, two Equations are developed in order to analytically predict pultruded junctions' rotational stiffness per unit of width. In general, the theoretical and experimental results agreed fairly well, with a maximum difference of 24% for I-sections and 38% for channels.
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页数：17
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