Simplified dynamic analysis of reinforced-concrete beams under impact actions

Guo, Jinlong; Cai, Jianguo; Zuo, Zhi‐Liang

doi:10.1680/jstbu.16.00033

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Such loads, which are characterized by short duration (of few milliseconds) and high intensities (significantly higher than the load-carrying capacity of the structural components established from static and seismic [shake table] tests), can be generated during the collision of vehicles or other objects with structural components (beams, columns, walls, or slabs). It has been established, both experimentally [1][2][3][4][5][6][7][8][9][10][11][12] and numerically 3,5,8,9,[13][14][15][16][17][18][19][20] that, once certain thresholds of the rate and intensity of the applied loading are surpassed, the dynamic response of RC beams under impact loading exhibits significant departures from that established from static tests. The available numerical and test data reveal that, with increasing loading rates, RC beams exhibit a more localized response, since the portion of the beam reacting to the external load reduces in length as cracking (and often failure) occurs prior to the generated stress waves reaching the supports.…”

Section: Introductionmentioning

confidence: 99%

“…Such loads, which are characterized by short duration (of few milliseconds) and high intensities (significantly higher than the load-carrying capacity of the structural components established from static and seismic [shake table] tests), can be generated during the collision of vehicles or other objects with structural components (beams, columns, walls, or slabs). It has been established, both experimentally [1][2][3][4][5][6][7][8][9][10][11][12] and numerically 3,5,8,9,[13][14][15][16][17][18][19][20] that, once certain thresholds of the rate and intensity of the applied loading are surpassed, All data referred to in this publication are available upon request from the corresponding author Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.…”

Section: Introductionmentioning

confidence: 99%

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Drop‐weight testing of slender reinforced concrete beams

Madjlessi

Cotsovos

Moatamedi

2021

Structural Concrete

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The work presented herein sets out to investigate experimentally, via drop-weight testing, the behavior of slender reinforced concrete (RC) beam specimens under impact loading. During testing, the behavior of each specimen is established through the combined use of conventional instrumentation and a high-speed video camera. The primary objective of this work is to investigate the reasons that trigger the observed shift in specimen behavior (compared to that established from static tests) with increasing levels of applied loading rate and intensity. Analysis of the test data reveals that during drop-weight testing only a portion of the element span reacts to the applied load (as indicated by the deformation and cracking profiles recorded) which in turn affects the mechanics underlying specimen behavior and therefore, significantly influencing the mode of failure ultimately exhibited.The observed localized response becomes more prominent by increasing the loading rate and intensity of the imposed impact loading. In addition to the above, the strain-rate sensitivity of the material properties of concrete does not appear to have a significant effect on the behavior of the specimens tested. The aforementioned observations appear to be in conflict with current design practice raising questions concerning the effectives of the design solutions produced.

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Section: Introductionmentioning

confidence: 99%

“…Such loads, which are characterized by short duration (of few milliseconds) and high intensities (significantly higher than the load-carrying capacity of the structural components established from static and seismic [shake table] tests), can be generated during the collision of vehicles or other objects with structural components (beams, columns, walls, or slabs). It has been established, both experimentally [1][2][3][4][5][6][7][8][9][10][11][12] and numerically 3,5,8,9,[13][14][15][16][17][18][19][20] that, once certain thresholds of the rate and intensity of the applied loading are surpassed, All data referred to in this publication are available upon request from the corresponding author Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.…”

Section: Introductionmentioning

confidence: 99%

Drop‐weight testing of slender reinforced concrete beams

Madjlessi

Cotsovos

Moatamedi

2021

Structural Concrete

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“…Guo et al (2017) develop a mass-spring model to predict the response of reinforced-concrete beams to low velocity impacts as might arise from, for example, a vehicle impact. The model includes the local effect of the impacting body on the surface of the concrete beam; how this is accounted for is explained in detail.…”

mentioning

confidence: 99%

Editorial

Davison¹

2017

Proceedings of the Institution of Civil Engineers - Structures

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Welcome to this issue of Structures and Buildings. The papers this month cover a wide range of topics, from detailed consideration of joints in both steel and precast concrete, to the seismic response of braced buildings and the dynamic response of reinforced-concrete beams under impact, to steel plate girders with tubular compression flanges and the shear behaviour of fibre-reinforced-concrete beams. All the papers relate to practical problems faced by practitioners and offer new methods of analysis, design or implementation.A neural network model has been developed by Doran et al. (2017) to study the seismic response of braced steel-framed buildings. The use of steel concentrically braced frames is restricted to low-to-moderate seismic regions and low-rise buildings. Recent studies of the response of such frames under moderate earthquakes has shown them to perform better than expected and this paper sets out to investigate further using two example buildings, one of three stories and a second much taller one of nine stories. As step-by-step time-history analyses are time consuming to conduct, the paper explores how the use of a neural network model might capture the behaviour of the frames under seismic action. The development of the neural network is described in detail before conducting sensitivity analyses. Valuable insights into the dynamic response of concentrically braced frames to seismic loads are provided alongside evidence to suggest that neural network models could form the basis of practical design tools.When using precast concrete it is clearly important to tie together the individual components to achieve a robust structure. For precast wall elements, this is commonly done using U bars, through which a lock bar is inserted and grouted in place. As installation of the wall panels is impeded by the protruding U bars, alternative solutions using high-strength wire ropes have been developed. Joergensen et al. (2017) have conducted a series of tests on precast concrete shear joints incorporating high-strength wire ropes and developed a design model to predict the failure load. An accurate design model is important because wire ropes, although very strong, do not yield and therefore may result in undesirable brittle failure of the joint. It is therefore essential that the wire rope is the strongest part of the joint and ensure that failure occurs in a ductile manner by yielding of the lock bar and crushing of the joint mortar. The development of the design model is described in detail and compared with eleven tests recently conducted by the authors and twenty-nine reported in the literature.Conventional steel plate girders are, as the name implies, fabricated from flat plate. Replacing the compression flange with a tubular section may improve material efficiency by improving local capacity and resistance to lateral torsional buckling. Kharoob (2017) presents the results of a detailed finite-element investigation of the effect of tubular section shape (i.e. radius of gyration and section modulus) on the...

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Dynamic Responses of RC Columns under Axial Load and Lateral Impact

Sun

Chen

et al. 2023

J. Struct. Eng.

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Simplified dynamic analysis of reinforced-concrete beams under impact actions

Cited by 5 publications

References 9 publications

Drop‐weight testing of slender reinforced concrete beams

Drop‐weight testing of slender reinforced concrete beams

Editorial

Dynamic Responses of RC Columns under Axial Load and Lateral Impact

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