Numerical study of full-scale CFRP strengthened open-section steel columns under transverse impact

Abstract

In recent years, externally bonded fibre reinforced polymer (FRP) material has gained popularity as an efficient means of strengthening existing civil engineering infrastructure. In the case of steel structures, FRP has frequently been deployed to strengthen against static and fatigue loads.However, the understanding of the effect of impact load on strengthened structures is still in its early stages. In parallel with this, most of the existing studies on impact have concentrated on small scale elements. Thus, the study presented here is aimed at examining the effectiveness of carbon fibre reinforced polymer (CFRP) in strengthening full-scale steel I-section columns against impact load. To achieve this aim, a non-linear finite element model built using ABAQUS was validated against experimental tests and then used to simulate the strengthening technique.The model included failure criteria of all investigated materials (steel, CFRP and adhesive material). Various parameters including boundary conditions, preloading level, kinetic energy, impact location and impact direction were examined.The CFRP strengthening technique was found to be highly effective in preventing column failure whether by global buckling failure or transverse shear failure. In addition the strengthened columns exhibited a reduced axial and transverse displacement by more than 70% in many cases.

Numerical investigation of hybrid UHPC columns subject to lateral impact

“…Similar observations have been reported by other researchers albeit within the context of steel columns under impact [50]. The location of the middle plastic hinges for the columns simulated under 75% pre-loading level changed dramatically depending on the length of UHPC segment.…”

“…The trend described in the previous paragraph seems to be opposite of what would be expected when a combination of axial load and lateral impact is applied. Numerous existing studies in the case of steel columns subjected to lateral impact and axial pre-loads show that the presence of axial load has a negative effect on the impact response of the column (high mid-span deflection, low plateau impact force and long impact duration) [2,50]. However, it seems that the presence of axial load improves impact response of the hybrid concrete columns examined here by reducing mid-span displacement and impact duration and increasing plateau impact force.…”

Numerical modelling of concrete-filled stainless steel slender columns loaded eccentrically

“…The second part – which represents the inelastic part – was introduced using the values of yield and ultimate strengths. PLASTIC option in ABAQUS was used to model the stainless steel section – which commonly used to model steel and stainless steel (Kadhim et al , 2019; Ellobody, 2013a). This kind of material modelling was used because in the experimental work simulated in this research (Tokgoz, 2015), the values of yield and ultimate strengths were only provided.…”

Discrete Material and Thickness Optimization of Pop-Up Seat Frame in Static Condition

“…The seat frame must meet various safety standards and also consider weight reduction to improve fuel economy [8][9][10]. Previous studies on the lightweight seat frame have reduced the weight of specific parts by applying high-strength and lightweight materials or by adjusting their geometry and thicknesses [11][12][13][14][15][16][17][18]. It is almost impossible, however, that high-strength lightweight materials, such as carbon fiber reinforced plastic (CFRP) and advanced high strength steel (AHSS), are applied to all the parts.…”