Prototype impact tests on ultimate impact resistance of PC rock-sheds

Kıshı, Norimitsu; Konno, Haruyuki; Ikeda, Kenichi; Matsuoka, Ken-ichi G.

doi:10.1016/s0734-743x(02)00019-2

Cited by 60 publications

(18 citation statements)

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“…Several impact tests have been used to demonstrate the relative brittleness and impact resistance of concrete and similar construction materials [9][10][11][12]. However, none of these tests have ben declared to be a standard test due to the lack of statistical data on the variation of the results.…”

Section: Introductionmentioning

confidence: 99%

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Badr

Ashour

Platten

2006

International Journal of Impact Engineering

127

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Impact resistance of polypropylene fibre-reinforced concrete was investigated using the repeated drop weight impact test recommended by ACI Committee 544. The results were analysed based on a statistical approach. The variation in results was examined within the same batch and between different batches. Statistical parameters were compared with reported variations in impact resistance of concrete composites reinforced with other types of fibres such as carbon and steel fibres. Statistical analysis indicated that the results obtained from this test had large variations and it is necessary to increase the number of replications to at least 40 specimens per concrete mix to assure an error below 10%. It is concluded that this test with its current procedures and recommendations should not be considered a reliable impact test. This study has highlighted the need for modifying this test in such a way as that increases its accuracy and reduces the large variation in results.

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Section: Introductionmentioning

confidence: 99%

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Badr

Ashour

Platten

2006

International Journal of Impact Engineering

127

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“…For this reason, extensive damage and losses may be observed. Various experimental [1][2][3][4][5][6][7][8][9] and numerical studies [10][11][12][13][14][15][16][17][18][19][20][21] have recently been developed by many scientists to facilitate better understanding of these complex impactrelated situations. The resistance of structural members to impacts has been determined in literature through several experimental studies based on the use of testing apparatuses and essential test devices [22,23].…”

Section: Introductionmentioning

confidence: 99%

Non-linear analysis of reinforced concrete slabs under impact effect

2017

JCE

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Non-linear analysis of reinforced concrete slabs under impact effectMost of the existing structures are designed to resist static loads only. Various researchers indicate that sudden loads affecting structural members should also be considered in the design phase. Surfaces of many structures are covered with concrete slab members that are under the effect of sudden loads such as accidental drops, rock falls, or military attacks. A non-linear analysis of RC slabs is performed in this study using the Abaqus software. Impact parameters such as accelerations, velocities, displacements, impact forces, and energy capacities, are determined for each slab. Nelinearna analiza ab ploča opterećenih udarnim opterećenjem Većina postojećih konstrukcija projektirana je tako da se odupre samo statičkim opterećenjima. Brojni istraživači ukazuju da u projektnoj fazi treba razmotriti i iznenadna opterećenja. Površine mnogih građevina izvedene su ab pločama koje su pod utjecajem iznenadnih opterećenja poput iznenadnih padova različitih elemenata, odrona kamenja ili vojnih djelovanja. Nelinearna analiza ab ploča u radu je provedena primjenom računalnog programa ABAQUS. Određeni su i detaljno analizirani parametri udara kao što su ubrzanja, brzine, pomaci, udarne sile i energetski kapaciteti za svaku ploču.

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“…With numerical simulation, Vilajosana et al (2008) indicated that the signals of impact force vary with density of buffer material, incident angle, weight of rockfalls, and drop height. Kishi et al (2002) indicated that a cushion layer of sandy soil on the protection measures reduces the impact force to a great extent and the thicker the cushion layer, the greater the buffering effect. The same conclusion was also made by Kawahara and Muro (2006) and Abdul and Norimitsu (2010).…”

Section: Introductionmentioning

confidence: 99%

Impact of rockfalls on protection measures: an experimental approach

Yuan

Huang

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. The determination of rockfall impact force is crucial in designing protection measures. In the present study, laboratory tests are carried out by testing the weight and shape of the falling rock fragments, drop height, incident angle, platform on the slideway, and cushion layer on the protection measures to investigate their influences on the impact force. The test results indicate that the impact force is positively exponential to the weight of rockfall and the instantaneous impact velocity of the rockfall approaching the protection measures. The impact velocity is found to be dominated not only by the drop height but also by the shape of rockfall and the length of the platform on the slideway. A great drop height and/or a short platform produces a fast impact velocity. Spherical rockfalls experience a greater impact velocity than cubes and elongated cuboids. A layer of cushion on the protection measures may reduce the impact force to a greater extent. The reduction effects are dominated by the cushion material and the thickness of the cushion layer. The thicker the cushion layer, the greater the reduction effect and the less the impact force. The stiffer the buffer material, the lower the buffering effect and the greater the impact force. The present study indicates that the current standard in China for designing protection measures may overestimate the impact force by not taking into consideration the rockfall shape, platform, and cushion layer.

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Prototype impact tests on ultimate impact resistance of PC rock-sheds

Cited by 60 publications

References 1 publication

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Non-linear analysis of reinforced concrete slabs under impact effect

Impact of rockfalls on protection measures: an experimental approach

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