Elastic–plastic response spectra for exponential blast loading

Gantes, Charis J.; Pnevmatikos, Nikos

doi:10.1016/s0734-743x(03)00077-0

Cited by 51 publications

(29 citation statements)

References 5 publications

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“…If t d /T is less than 0.5, then the maximum deformation occurs during the free vibration and is mainly controlled by the time integral of the phase, independent of the shape of loading. Similar conclusions can also be found in Chopra [10] and Gantes and Pnevmatikos [13].…”

Section: Response Of Sdof Models Under Blast With Negative Phasesupporting

confidence: 90%

“…Widely referred response spectra for blast design given in UFC 3-304-2 [2] are for elasticplastic resistance functions and for idealised blast load with positive phase only. Gantes and Pnevmatikos [13] employed an elastic-perfectly plastic resistance function to compare response spectra obtained using exponential load. In the present research, response spectra were obtained for elastic-plastic hardening using exponential blast load with negative phase to mainly investigate the effect of negative phase on a realistic idealised structure.…”

Section: Response Of Sdof Models Under Blast With Negative Phasementioning

confidence: 99%

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Effect of Large Negative Phase of Blast Loading on Structural Response of RC Elements

Syed

Mendis

Rahman

2016

MATEC Web of Conferences

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Abstract. Structural response of reinforced concrete (RC) elements for analysis and design are often obtained using the positive phase of the blast pressure curve disregarding the negative phase assuming insignificant contribution from the negative phase of the loading. Although, some insight on the effect of negative phase of blast pressure based on elastic single-degree-offreedom (SDOF) analysis was presented before, the influence of negative phase on different types of resistance functions of SDOF models and on realistic finite element analysis has not been explored. In this study, the effects of inclusion of pulse negative phase on structural response of RC elements from SDOF analysis and from more detailed finite element analysis have been investigated. Investigation of SDOF part has been conducted using MATLAB code that utilizes non-linear resistance functions of SDOF model. Detailed numerical investigation using finite element code DIANA was conducted on the significance of the negative phase on structural response. In the FE model, different support stiffness was used to explore the effect of support stiffness on the structural response due to blast negative phase. Results from SDOF and FE analyses present specific situations where the effect of large negative phase was found to be significant on the structural response of RC elements.

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Section: Response Of Sdof Models Under Blast With Negative Phasesupporting

confidence: 90%

Section: Response Of Sdof Models Under Blast With Negative Phasementioning

confidence: 99%

Effect of Large Negative Phase of Blast Loading on Structural Response of RC Elements

Syed

Mendis

Rahman

2016

MATEC Web of Conferences

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“…The linear expression will have the same peak negative phase pressure and impulse as the cubic expression for any scaled distance, and will therefore have little difference on target response for impulse-driven analyses. For dynamic and quasi-static analyses, however, the pulse shape has been shown to have an influence on the response of structures to blast loads [22,31,32], and it is therefore recommended that the cubic expression should be used in analysis, on account of it better matching the experimental pressure waveform seen in Figure 5. For the purpose of this article, however, it is more important to highlight the difference between the cubic expression, extended Friedlander expressions and neglecting the negative phase altogether, rather than focussing on the importance of pulse shape, and therefore the linear simplification of the negative phase as a bilinear pulse is not considered further.…”

Section: The Infuence Of the Negative Phase On Elastic Systemsmentioning

confidence: 99%

The Negative Phase of the Blast Load

Rigby

Tyas

Bennett

et al. 2014

International Journal of Protective Structures

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“…In addition, the pressure phase below the ambient pressure is neglected. As Gantes and Pnevmatikos [15] mention, this pressure phase is less signi…cant as is larger than one, which is the case for this study. is similar except it has a linear rise as opposed to an instantaneous rise.…”

Section: Modi…ed Friedlander Loading Model With and Without A Precedimentioning

confidence: 68%

“…Gantes and Pnevmatikos [15] propose a response spectra based on a blast pressure pro…le with an exponential distribution and then compare it to one with a triangular distribution.…”

Section: Literature Review On Blast Loadingmentioning

confidence: 99%

Sensitivity analysis of blast loading parameters and their trends as uncertainty increases

Borenstein

Benaroya

2009

Journal of Sound and Vibration

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A sensitivity analysis of blast loading parameters is performed to determine which of the parameters'uncertainty has the greatest e¤ect on the maximum de ‡ection of an aluminum plate subjected to a blast load. A numerical simulation using the Monte Carlo method is used to obtain the ensemble averages of the probabilistic runs. The random variables were given a uniform distribution. Two simpli…ed loading models are used. The …rst has an instantaneous rise with an exponential decay, represented by the modi…ed Friedlander equation. The second loading model has a linear rise with an exponential decay. Both of these models are simulated with three di¤erent blast scaled values, giving a total of six di¤erent cases. In addition, the de ‡ection trends due to the loading parameters as uncertainty increases is quanti…ed. Probability density functions of the maximum de ‡ection are also presented. The probabilistic results and trends are also explained using deterministic methods. It appears that the duration time of the loading models is generally the most sensitive parameter to uncertainty.ii Acknowledgements First and foremost, I would like to acknowledge my advisor Professor Haym Benaroya. I feel very lucky and honored to have him as my advisor. He is a great advisor and is always willing to give up his time to help. In addition, he is constantly looking out for his students.For instance, he would make sure that other professors, whom I was a teaching assistant for, do not give me a workload greater than the amount I was supposed to have. He has also provided me with a great deal of support, both academically as well as …nancially.A very big acknowledgement goes to Dr. Jason Florek who has become a great colleague and friend of mine. From the start he has helped me to understand the subject of blast loads and supplied me with many journal articles and books on the subject. He was always willing to help answer any questions I had on the subject, or for that matter, on any subject.I also used his response model in my work. On a personal note, he is always fun to hangout with and made it enjoyable to come to the o¢ ce or go to conferences. He even learned how to play goalie for our MAE United soccer team. Jason, thank you very much for everything.

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Elastic–plastic response spectra for exponential blast loading

Cited by 51 publications

References 5 publications

Effect of Large Negative Phase of Blast Loading on Structural Response of RC Elements

Effect of Large Negative Phase of Blast Loading on Structural Response of RC Elements

The Negative Phase of the Blast Load

Sensitivity analysis of blast loading parameters and their trends as uncertainty increases

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