Low-Elevation Impact Tests of Axially Loaded Reinforced Concrete Columns

Gurbuz, Tuba; İlki, Alper; Thambiratnam, David; Perera, Nimal

doi:10.14359/51710862

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…5(b and c)]. Several studies indicated the change of failure mode from flexural to shear failure when the impact energy is higher (Fan et al 2019;Gurbuz et al 2019). While in Fig.…”

Section: Damage Modesmentioning

confidence: 96%

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Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading

Wang

Liu

et al. 2020

J. Compos. Constr.

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The lateral impact behavior of hybrid fiber-reinforced polymer (FRP)-ultrahigh-performance concrete (UHPC)-steel double-skin tubular columns (DSTCs) was experimentally investigated in this study. Seven specimens, which had an outer diameter of 168 mm and a length of 2,000 mm, were tested under lateral impact loading. Different parameters, including the axial force level, impact energy, concrete type, void ratio, FRP tube thickness, and the presence/absence of the FRP tube, were investigated. The dynamic responses, including global/ local damage modes, lateral deflection-time histories, impact force-time histories, strain-time histories, and acceleration-time histories, were investigated. The test results prove that the hybrid UHPC DSTCs exhibit very ductile behavior under lateral impact loading. The hybrid UHPC DSTCs have a higher lateral impact resistance capacity as compared to the hybrid DSTCs infilled with normal-strength concrete. The lateral impact resistance capacity of hybrid UHPC DSTCs with an applied axial force of 200 kN can be improved to some extent compared with those without any axial force. The impact energy, the void ratio, the FRP tube thickness, and the presence/absence of the FRP tube can significantly affect the lateral impact behavior of hybrid UHPC DSTCs. Furthermore, the lateral impact behaviors of hybrid DSTCs, concrete-filled double-skin steel tubes (CFDSTs), and concrete-filled steel tubes (CFSTs) were compared and discussed based on the experimental results in this study as well as in other literature studies.

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“…5(b and c)]. Several studies indicated the change of failure mode from flexural to shear failure when the impact energy is higher (Fan et al 2019;Gurbuz et al 2019). While in Fig.…”

Section: Damage Modesmentioning

confidence: 96%

“…Although some knowledge has been given, more studies are still needed. Specifically, as an important parameter, the effect of axial load level on the lateral impact behavior of hybrid DSTCs has not been experimentally investigated (Fan et al 2019;Gholipour et al 2018;Gurbuz et al 2019;Thilakarathna et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading

Wang

Liu

et al. 2020

J. Compos. Constr.

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“…Typically, hydraulic testing machines or similar devices are used to test the mechanical properties of materials at low strain rates, a high-speed testing machine or drop hammer impact testing system are used to test the mechanical properties at an intermediate rate, while SHPB or Gas gun devices are usually used to estimate the mechanical properties at high strain rates, as shown in Figure 1 [7,8]. Due to several prominent advantages in terms of the simplicity of operation, low cost, and excellent testing accuracy, the SHPB test setup has gained widespread application in the field of research on the dynamic mechanical performance of concrete materials [9,10]. In the theoretical study of the dynamic mechanical performance of concrete, one of the hot topics primarily focuses on the Dynamic Increase Factor (DIF), which represents the ratio of dynamic to static compressive strength of concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Mechanical Performance of Post-Fire Concrete Confined by CFRP Sheets

Liu,

Huo,

Wang

et al. 2024

Materials

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Impact tests on post-fire concrete confined by Carbon Fiber-Reinforced Polymer/Plastic (CFRP) sheets were carried out by using Split Hopkinson Pressure Bar (SHPB) experimental setup in this paper, with emphasis on the effect of exposed temperatures, CFRP layers and impact velocities. Firstly, according to the measured stress-strain curves, the effects of experiment parameters on concrete dynamic mechanical performance such as compressive strength, ultimate strain and energy absorption are discussed in details. Additionally, temperature caused a softening effect on the compressive strength of concrete specimens, while CFRP confinement and strain rate play a hardening effect, which can lead to the increase in dynamic compressive strength by 1.8 to 3.6 times compared to static conditions. However, their hardening mechanisms and action stages are extremely different. Finally, nine widely accepted Dynamic Increase Factor (DIF) models considering strain rate effect were summarized, and a simplified model evaluating dynamic compressive strength of post-fire concrete confined by CFRP sheets was proposed, which can provide evidence for engineering emergency repair after fire accidents.

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“…Al-Bukhaiti et al [45] and Chen et al [46] carried out studies on scaled specimens despite the presence of axial loads. Gurbuz et al [47] conducted low-elevation impact tests on axially loaded RC columns and stated that columns designed as flexure-critical could present insufficient shear strength under impact. Therefore, conventionally designed roadside columns and parking lot columns could present poor performance against vehicle impacts regarding the conducted low-elevation impact tests on axially loaded full-scale specimens.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Residual Static Behavior of Axially Loaded RC Columns Subjected to Low-Elevation Impact Loading

Cengiz,

Gurbuz,

Ilki

et al. 2023

Buildings

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Columns can suffer heavy damage due to dynamic impact effects, which are ignored during their design. The impact effect could be a vehicle crash to columns of streetside buildings, parking garages or bridges. However, the effect of impact loading on the behavior of reinforced concrete columns has not been sufficiently studied. In this study, an experimental and numerical investigation is carried out on the impact behavior of axially loaded reinforced concrete columns. Dynamic experiments were carried out by dropping a mass from different heights to apply low-elevation impact on axially loaded, full-scale (30 × 30 × 320 cm) columns. After evaluating the performance of the columns under varied impact loadings, the residual load carrying capacities of the columns were also obtained by static loading. Additionally, a three-dimensional finite element model was developed and validated by using drop weight experimental results. The effect of increasing the impact energy on the behavior of RC columns was also examined numerically. As a result of the research, it has been observed that, as the applied impact energy increases, the dynamic damage/failure mode changes from flexure to shear. When a column was impacted by 75.8% of its total impact energy capacity, a decrease of 38.1% in its stiffness and a decrease of 49.7% in its load carrying capacity were determined compared to its previous unimpacted state. Additionally, the static energy dissipation capacity loss of the column was reached, up to 81.7% of its preloading state. The developed finite element model can also be utilized to determine the dynamic performance and the damage modes of columns under vehicle collision-type low-elevation impacts, which can be a guide for structural engineers in the design of such vulnerable columns and will contribute to safer structural designs.

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Low-Elevation Impact Tests of Axially Loaded Reinforced Concrete Columns

Cited by 19 publications

References 9 publications

Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading

Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading

Experimental Study on Dynamic Mechanical Performance of Post-Fire Concrete Confined by CFRP Sheets

Dynamic and Residual Static Behavior of Axially Loaded RC Columns Subjected to Low-Elevation Impact Loading

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