Pendulum impact loading tests of precast concrete columns with various column base connections

Zhou, Yun; Yang, Jian‐Bo; Luo, Xianming; Hwang, Hyeon‐Jong; Chen, Hui; Sun, Jing-Ming; Yi, Wei-Jian; Kang, Su-Min

doi:10.1016/j.engstruct.2021.113736

Cited by 14 publications

(3 citation statements)

References 31 publications

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“…It should be pointed out that considerable efforts have been conducted in the area of blast loading response of RC elements such as RC columns [28][29][30][31][32]; the work efforts have two parts: experimental and theoretical. However, this paper aims to comprehensively review on existing modelling studies in the literature investigating the loading mechanisms, dynamic responses, and failure behaviors of RC panels subjected to blast loads.…”

Section: Optimum Modelling Approachmentioning

confidence: 99%

Challenges in Modelling Reinforced Concrete Panels Subjected to Blast Load - A Critical Review

Mohammed¹,

Almansour²

2022

J. Civ. Eng. Constr.

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Reinforced concrete panels are widely used in modern facilities, and evaluating their blast loading capacity is vital for security-critical assets. Due to the high impulsive nature of blast loads, the response of reinforced concrete panels is characteristically different from that under static or low dynamic load conditions. The failure of individual components often initiates the blast load's destructive effects on the entire structure. The material breach can be caused by stress wave localized effects before the general structural response becomes significant. Numerical methods are one of the key methods for studying the behaviour of reinforced concrete panels under blast load. This paper aims to review the current state of practice in modelling reinforced concrete panels and predicting their blast capacity and failure mechanisms under blast load. The work addresses the research gaps associated with using advanced finite element modelling as compared to test results.

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Section: Optimum Modelling Approachmentioning

confidence: 99%

Challenges in Modelling Reinforced Concrete Panels Subjected to Blast Load - A Critical Review

Mohammed¹,

Almansour²

2022

J. Civ. Eng. Constr.

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“…Europe, America, Japan, and other countries lead the research on impact testing machines and have developed various forms of them, such as free-fall hammers [ 6 ], pendulum hammers [ 7 ], vibration impact [ 8 ], pulse-type [ 9 ], explosion [ 10 ], and high-speed tension [ 11 ], which are widely used in material research [ 12 , 13 , 14 , 15 , 16 , 17 ]. Agirre et al [ 18 ] constructed an automatized forging hammer that is accelerated with a pneumatic cylinder and is able to speed up the upper anvil up to 5 m/s.…”

Section: Introductionmentioning

confidence: 99%

Development of an Instantaneous Loading Impact Test System for Containment of a Nuclear Power Plant during Aircraft Impact on Steel Bar Joints

et al. 2023

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As major projects such as nuclear power plants continuously increase, it is inevitable that loopholes will arise in safety precautions. Airplane anchoring structures, comprising steel joints and acting as a key component of such a major project, directly affect the safety of the project due to their resistance to the instant impact of an airplane. Existing impact testing machines have the limitations of being unable to balance impact velocity and impact force, as well as having inadequate control of impact velocity; they cannot meet the requirements of impact testing for steel mechanical connections in nuclear power plants. This paper discusses the hydraulic-based principle of the impact test system, adopts the hydraulic control mode, and uses the accumulator as the power source to develop an instant loading test system suitable for the entire series of steel joints and small-scale cable impact tests. The system is equipped with a 2000 kN static-pressure-supported high-speed servo linear actuator, a 2 × 22 kW oil pump motor group, a 2.2 kW high-pressure oil pump motor group, and a 9000 L/min nitrogen-charging accumulator group, which can test the impact of large-tonnage instant tensile loading. The maximum impact force of the system is 2000 kN, and the maximum impact rate is 1.5 m/s. Through the impact testing of mechanical connecting components using the developed impact test system, it was found that the strain rate of the specimen before failure was not less than 1 s−1, meeting the requirements of the technical specifications for nuclear power plants. By adjusting the working pressure of the accumulator group, the impact rate could be controlled effectively, thus providing a strong experimental platform for research in the field of engineering for preventing emergencies.

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“…Although terrorist attacks have escalated in recent decades, impact analysis has become critical to guarantee that buildings are secure. Impact loading scenarios include the influence of falling items on industrial flooring [ 2 ], impacts from a ship or ice collisions on the seafloor and offshore structures [ 3 ], accidents involving vehicles and bridges or structures [ 4 ] and nuclear containment facilities that are affected by airplanes and missiles [ 5 ]. As a result of the confined and transitory nature of impact loading, structural elements exposed to it may react differently from those under a static load.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Modeling of Flexural Impact Strength of Preplaced Aggregate Fibrous Concrete Beams

2022

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Preplaced aggregate fibrous concrete (PAFC) is a revolutionary kind of concrete composite that is gaining popularity and attracting the interest of academics from across the world. PAFC is a uniquely designed concrete prepared by stacking and packing premixed fibers and coarse aggregate in a steel mold. The gaps between the fibers and aggregates are subsequently filled by injecting a cement grout with high flowability. This study investigates the impact performance of three different sizes of PAFC beams. Steel and polypropylene fibers were used in a 3% dosage to make three different beam sizes, measuring 550 × 150 × 150 mm, 400 × 100 × 100 mm, and 250 × 50 × 50 mm. According to ACI Committee 544, all beams were subjected to a drop weight flexural impact test. Compressive strength, impact energies at initial crack and failure, ductility index, and failure mode were evaluated. Additionally, analytical modeling was used to compute the failure impact energy for the fibrous beams. The results showed that the addition of fibers increased the capacity of the tested beams to absorb greater flexural impact energy. Compared to polypropylene fibers, steel fibers had better crack propagation and opening resistance because of their higher tensile strength and crimped and hooked end configuration. For all large-size beams, the analysis of the percentage increase in impact energy at the failure stages was found to be 5.3 to 14.6 times higher than the impact energy at cracking.

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Pendulum impact loading tests of precast concrete columns with various column base connections

Cited by 14 publications

References 31 publications

Challenges in Modelling Reinforced Concrete Panels Subjected to Blast Load - A Critical Review

Challenges in Modelling Reinforced Concrete Panels Subjected to Blast Load - A Critical Review

Development of an Instantaneous Loading Impact Test System for Containment of a Nuclear Power Plant during Aircraft Impact on Steel Bar Joints

Experimental and Analytical Modeling of Flexural Impact Strength of Preplaced Aggregate Fibrous Concrete Beams

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