Vibration Analysis of Foundations Subjected to Pulse Excitations with Negative Phase

Maheshwari, Piyush; Yadav, Sujeet

doi:10.1007/s40098-021-00589-6

Cited by 2 publications

(2 citation statements)

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“…In this context, El Naggar (2000Naggar ( , 2003 performed analyses to determine the response of machine foundations subjected to vibrations from ground transmitted excitations. Maheshwari and Yadav (2022) developed analytical solution for the elastic response of foundations under the influence of harmonic and pulse loading. However, under the combined application of unbalanced load and pulse loading, the foundation will undergo large vibrations resulting in the emergency shutdown event (ESD), where the electricity is shut down immediately.…”

Section: Introductionmentioning

confidence: 99%

“…Studies analysing the dynamic behaviour of foundations subjected to loads from an explosion considering the elastic-plastic analysis are limited (Souli and Shahrour 2012; Jayasinghe et al 2014, 2018). Further, the elastic-plastic response analysis of machine foundation systems under the action of blast loads are scanty (Maheshwari and Naramsetti 2019; Samanta and Maheshwari 2022a, 2022b; Maheshwari and Yadav 2022).…”

Section: Introductionmentioning

confidence: 99%

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Elasto-plastic analysis of foundations during emergency shutdown due to blast loading

Samanta

Maheshwari

2023

International Journal of Protective Structures

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Behaviour of machine foundations is investigated in this study under harmonic loading with varying frequency and pulse loading. Owing to excessive vibrations from the pulse, the machine encounters an emergency shutdown where the machine’s exciting frequency reduces to zero exponentially. The analysis is performed considering an elastic plastic single degree of freedom system with hardening and softening behaviour. Two cases are analysed depending on the time of application of pulse loading to the foundation system. For both the cases, the governing equations of motion are acquired and solved numerically using the fourth order Runge-Kutta method. Using these solutions, displacement-time graphs are obtained for a variety of parameters such as time constant, hardening/softening index, mass of machine and the foundation block, stiffness, pulse load magnitude, damping ratio and decay coefficient to study their influence on the behaviour of the machine-foundation system. The study helps in predicting the dynamic response of foundations under the emergency shutdown conditions due to pulse loading. Further, these also help in taking the decision if there exists a need for vibration barriers to have the displacements well within the permissible limits.

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Section: Introductionmentioning

confidence: 99%