Dynamic Responses of RC Columns under Axial Load and Lateral Impact

Sun, Jing-Ming; Yi, Wei-Jian; Chen, Hui; Peng, Fei; Zhou, Yun; Zhang, Wangxi

doi:10.1061/jsendh.steng-11612

Cited by 14 publications

(4 citation statements)

References 42 publications

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“…Impact loading is a highly severe condition characterized by applying intense force over a short period. The behavior of a structural component under impact loading may involve two response phases, the local response resulting from the stress wave at the loading point during the initial moments of impact, and the overall response, including the free vibration effect stemming from the elastic-plastic deformation that occurs over a longer period throughout the entire structural member after the impact [3,4]. The loading rate effect and the dynamic behavior of the structural component heavily influence the overall response.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, CFST and reinforced concrete members have been subjected to numerous studies on impact resistance, and progress has been made in some areas. Researchers developed new impact testing methods, investigated the effects of impact force on different materials and structures, and developed materials and designs that can withstand impact forces [4][5][6][7][8][9][10][11][12]. Pham et al [10] studied how the axial force, or the force exerted along the main axis of the concrete structure, affected the behavior and performance of reinforced concrete when subjected to impact loading.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the axial load on the dynamic response of the wrapped CFRP reinforced concrete column under the asymmetrical lateral impact load

et al. 2023

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This study investigated the impact of axial load on the dynamic response of reinforced concrete (RC) members to asymmetrical lateral impact loads. A series of asymmetrical-span impact tests were conducted on circular and square RC members with and without Carbon Fiber Reinforced Polymers (CFRP) while varying the axial compression ratios. The impact process was simulated using ABAQUS software, and the time history curves of deflection and impact were measured. The study found that specific impact loads caused bending and shearing failures. The axial compression ratio ranged from 0.05 to 0.13 when the impact curve reached its maximum deflection before the component’s impact resistance decreased. Analysis of the impact point and inclined crack location revealed that axial load affects the maximum local concrete. The speed of inclined crack penetration and inclined cracks take longer to form, with weaker resistance to damage to local concrete when the axial compression ratio is between 0.05 and 0.13. When the axial compression ratio is greater than 0.13, inclined cracks form sooner with more brittle and severe damage to the impact point’s concrete. The study also identified key parameters affecting the dynamic response of RC members, including impact height, CFRP layer thickness, axial force, and impact location. Thicker CFRP layers in RC can improve impact resistance, especially when the impact location is farther from the center. However, there is a limit to the impact of axial force on this resistance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the axial load on the dynamic response of the wrapped CFRP reinforced concrete column under the asymmetrical lateral impact load

et al. 2023

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“…In addition, patterns of deformations, changes in the impact strength, and lateral displacement were studied in the above-mentioned experiment-focused works. In [26], an important regularity was identified: the failure mechanism switches from bending to shearing in case of high-velocity impacts, accompanied by compression. A number of experimental studies address composite reinforced concrete columns strengthened by carbon, fiberglass, and CFRP [27,28].…”

Section: Introductionmentioning

confidence: 99%

The Bearing Capacity of Compressed Corrosion-Damaged Reinforced Concrete Elements under Lateral Pulse Loading

Tamrazyan

2023

Buildings

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This article addresses the relevant problem of the stress–strain behavior of compressed reinforced concrete columns under lateral pulse loading. A simplified engineering method of analyzing the limit value of lateral pulse loading P, depending on longitudinal force N acting on the column, is developed. The proposed method involves the construction of the P-N curve that has three portions. Portion 1 describes the plastic deformation of concrete and rebars of that part of the structure that is mostly in bending. Portion 2 describes the state of the column that can trigger the brittle failure of the concrete along the normal section, and Portion 3 describes the high compression of the column that predominantly triggers its shear failure. For Portions 1 and 2, analytical relationships are obtained using equilibrium equations. Corrosive damage is taken into account in the analytical model as a reduction in the strength and deformability characteristics of the material. A conventional local corrosion spot can be considered; it can be located both in and outside of the area of action of lateral pulse loading. The results obtained using the proposed model were compared with the results of numerical studies and a full-scale experiment. As a result of testing the developed engineering technique, it was found that it provides a safety margin for corrosion-damaged elements of 0.20–0.8 of the ultimate value of horizontal impulse at operational values of compressive force. The spot corrosion damage considered in the paper leads to a 10–60% strength reduction in compressed columns, depending on their location.

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“…As the axial pressure ratio increased, the damage mode of the column shifted from global to local with an increase in the initial peak impact force, inertia force, bending moment, and shear force, while the deflection deformation decreased. Jing-Ming Sun [8] showed that axial compression enhanced the overall transverse stiffness of the RC column, but increasing the axial compression ratio or impact velocity increased the inertia force and caused the column to change from bending damage to shear damage. When the impact velocity is constant, increasing the axial compression ratio from 0 to 0.24 improves the impact resistance of the column but increasing it to 0.64 adversely affects it.…”

Section: Introductionmentioning

confidence: 99%

Study on Impact Resistance of All-Lightweight Concrete Columns Based on Steel Fiber Reinforced and Various Axial Compression Ratio

Wang

Gao

et al. 2023

Buildings

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Concrete columns in service are exposed to threats such as accidental impacts and explosions, which pose potential risks to the safety of buildings. Although fully lightweight concrete elements prepared from non-sintered fly ash ceramic pellets and pottery sand are widely used in engineering practice, the dynamic response of such elements under impact loading is not supported by adequate research data. Therefore, in this study, the dynamic response of all-lightweight concrete columns under impact loading with different axial compression ratios (0.1, 0.2, and 0.3) was investigated by means of drop hammer impact tests, and the potential of shear wave steel fibers in mitigating structural damage and preventing structural failure was investigated. The results of the study reveal that the specimens primarily exhibit shear and bending damage under impact loading. With an axial compression ratio of 0.1, the specimen is dominated by bending damage. As the axial compression ratio increases from 0.1 to 0.3, the specimen’s damage mode transitions to shear damage dominance. This change results in a larger impact force and displacement response while experiencing lower displacement acceleration. Additionally, the introduction of steel fibers improves the strength and stiffness of the specimens, shifting their behavior from shear to bending damage. Consequently, this reduces impact damage, mid-span displacement, and displacement acceleration while enhancing the specimen’s response to the impact force and its capacity for deformation energy dissipation.

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Dynamic Responses of RC Columns under Axial Load and Lateral Impact

Cited by 14 publications

References 42 publications

Effect of the axial load on the dynamic response of the wrapped CFRP reinforced concrete column under the asymmetrical lateral impact load

Effect of the axial load on the dynamic response of the wrapped CFRP reinforced concrete column under the asymmetrical lateral impact load

The Bearing Capacity of Compressed Corrosion-Damaged Reinforced Concrete Elements under Lateral Pulse Loading

Study on Impact Resistance of All-Lightweight Concrete Columns Based on Steel Fiber Reinforced and Various Axial Compression Ratio

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