Parameter Study of Interfacial Capacities for FRP–Steel Bonded Joints Based on 3D FE Modeling

Abstract

This paper investigated the stress distribution of an adhesive layer for GFRP–steel bonded joints under 22.48 kN tensile loading using a three-dimensional numerical simulation. Firstly, a stress analysis of three paths was conducted, and after comparison, path II (through the middle layer of the bonding layer) was adopted as the analyzing path. Furthermore, a systemically parametric study of the effects of the FRP stiffness (i.e., elastic modulus and thickness), bonding length, adhesive thickness, and adhesive modulus was conducted. For the joints with different FRP elastic moduli, the minimum value of normal peeling stress was calculated as −3.80 MPa by the FRP for 10 GPa, showing a significantly severe stress concentration of FRP for 10 GPa. An analysis of the von Mises stresses proved that the increase in FRP stiffness could reduce the stress concentration of the adhesive layer effectively. The study of the effect of bonding lengths indicated that a more uniform peeling stress distribution could result from the longest bonding size; the largest peeling stress of 6.54 MPa was calculated for a bonding length of 30 mm. Further parameter analysis showed that the stress concentration of the adhesive layer could be influenced by the FRP thickness, bonding thickness, and elastic modulus of the adhesive layer.

A Sustainable Steel-GFRP Composite Bars Reinforced Concrete Structure: Investigation of the Bonding Performance

“…A node-to-surface contact model was employed to simulate the interface behavior between SFCBs and concrete [41]. A hard contact relationship was adopted in the normal direction at the contact interface to minimize penetration from the slave surface to the Master surface.…”

Parametric Investigation of Self-Centering Prestressed Concrete Frame Structures with Variable Friction Dampers

“…Under earthquakes, the energy-dissipating devices are activated by gap openings between the beams and columns to mitigate the damage to structural components. Recentering systems, such as prestressed strands [14], SMA [15], and fiber-reinforced polymers (FRP) [16][17][18][19], are used to mitigate the residual deformation of structures after earthquakes.…”

Compressive Performance of Longitudinal Steel-FRP Composite Bars in Concrete Cylinders Confined by Different Type of FRP Composites

“…Wu et al [10] proposed a steel-fiber-reinforced composite bar (SFCB), which is pultruded with an inner core steel bar and an outer fiber-reinforced polymer (FRP) layer, as shown in Figure 1a. The outer longitudinal fibers wrap the inner steel bar, providing superior anti-corrosion ability [11,12] and good interface bonding performance [13,14]. The composite effect of the outer elastic FRP layer and inner elastoplastic steel bar gives the SFCB a stable positive post-yield stiffness under both tensile and compressive loading [15], as shown in Figure 2.…”