Closed-form expressions for improved impact resistant design of reinforced concrete beams

Yong, Arnold C.Y.; Lam, Nelson; Menegon, Scott J.

doi:10.1016/j.istruc.2020.12.041

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…1d). At the same time, the existing research focuses on the single slab and pile impacted by rockfall (Wu et al, 2021;Yong et al, 2021). Therefore, analysis of structural dynamic response and concrete damage is crucial to determine its effectiveness in mitigating rockfall hazards.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Pile-Slab Retaining Wall Structure under Rockfall Impact

Zou,

Luo,

et al. 2023

Preprint

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Abstract. The numerical experiments investigate the dynamic response of a pile-slab retaining wall under the impact of rockfall. Firstly, a full-scale numerical model of a four-span pile-slab retaining wall satisfying specification requirements is established. Secondly, the numerical experiments investigate the dynamic response of a pile-slab retaining wall under different impact centers and velocities. Finally, the maximum impact energy that the structure can resist is predicted. Results reveal that: (1) During the impact process, the stress, strain, and concrete damage of the structure gradually spread from the impact center to the entire structure and ultimately result in permanent deformation; (2) The lateral displacement of pile at ground surface and the number of damage failure units under the pile as the impact center is greater than those under the slab as impact center. It shows that the impact position has a significant effect on the stability of the structure.(3) The impact force, interaction force, lateral displacement of pile at ground surface, and concrete damage is increased with the increase of impact velocity. Under pile as the impact center (slab as the impact center), when the velocity increases from 15 m/s to 30 m/s, the impact force increases by 1.42, 1.91, and 2.41 times (1.41, 1.90, and 2.41 times), the interaction force increases by 1.25, 1.47, and 1.68 times (1.24, 1.47, and 1.68 times), and the maximum lateral displacement of pile at ground surface increases by 1.57, 2.24, and 3 times (1.55, 2.23, and 3 times). (4) Utilizing this relationship between the impact velocity and the maximum lateral displacement of pile at ground surface, the estimated maximum impact energy that the pile-slab retaining wall can withstand is 905 kJ in this study when the structure top is taken as the impact point. Impact resistance of the structure optimized 1.814 times compared to traditional reinforced concrete retaining walls.

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Section: Introductionmentioning

confidence: 99%

Dynamic Response of Pile-Slab Retaining Wall Structure under Rockfall Impact

Zou,

Luo,

et al. 2023

Preprint

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“…At present, there are many studies on the impact test and numerical simulation of ordinary reinforced concrete columns [16][17][18][19][20], beams [21][22][23][24][25][26], and walls (plates) [27][28][29][30][31][32][33]. Civil air defense engineering shear walls play an important role in civil air defense engineering structures and are also the main force components under impact loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Analysis on Impact Resistance of Civil Air Defense Engineering Shear Wall

Shi

Zhang

et al. 2021

Advances in Civil Engineering

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In order to study the impact resistance of civil air defense engineering shear wall, the impact resistance of civil air defense engineering shear wall was studied by combining finite element numerical simulation with pendulum impact test. The effects of impact height, pendulum mass, and impact times on the impact resistance of civil air defense engineering shear walls were analyzed. It was shown that when the impact height increased from 0.4 m to 2.5 m, the failure mode of civil air defense engineering shear wall tended to be local impact failure, and the horizontal displacement in the middle of the wall span increased. The concrete crushing occurred in the impact area of the back of the civil air defense engineering shear wall. The increase in the impact height is a negative factor for the impact resistance of the civil air defense engineering shear wall. With the increase of pendulum weight, the number of concrete horizontal cracks in the back of the civil air defense engineering shear wall increased, while the number of vertical cracks decreased, but the impact surface was destroyed. Through multiple impact tests on the civil air defense engineering shear wall, the civil air defense engineering shear wall had accumulated damage. The longitudinally loaded steel on the back reached the ultimate strength, and there are large cracks at the bottom and even collapses. The increase of impact times has a great influence on the impact resistance of the civil air defense engineering shear wall. Through the analysis of the factors affecting the impact resistance of civil air defense engineering shear wall, it provides guidance for civil air defense engineering shear wall to resist impact load.

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