The Experts below are selected from a list of 13824 Experts worldwide ranked by ideXlab platform
S Ghosh - One of the best experts on this subject based on the ideXlab platform.
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optimum design of tuned liquid column dampers under stochastic Earthquake Load considering uncertain bounded system parameters
International Journal of Mechanical Sciences, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:Abstract The Tuned Liquid Column Damper (TLCD) is an effective alternative to the Tuned Mass Damper (TMD) to reduce the response of structures due to dynamic Loads. The optimum TLCD parameters are normally obtained based on the implicit assumption that the system parameters involved are deterministic. But, the efficiency of dampers may reduce if the TLCD parameters are not tuned to the vibrating mode it is designed to suppress due to the unavoidable presence of system parameter uncertainty. The study of TMD parameters’ optimization considering random system parameters is noteworthy. But, the same is not the case for liquid dampers. Moreover, though the damper parameters optimization under uncertain parameters in probabilistic framework is powerful; the approach cannot be applied in many real situations when the required detailed information to describe the parameters in probabilistic format is limited. In present work, the TLCD parameters optimization to control vibration of structures subjected to stochastic Earthquake Load under uncertain system parameters modeled as uncertain but bounded (UBB) type is studied. With the aid of matrix perturbation theory using first-order Taylor series expansion and interval extension of the dynamic response function, the vibration control problem is transformed to appropriate deterministic optimization problems yielding the lower and upper bound solution. Numerical study is performed to elucidate the effect of parameters’ uncertainties on the optimization of damper parameters and the performance of TLCD.
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unconditional reliability based design of tuned liquid column dampers under stochastic Earthquake Load considering system parameters uncertainties
Journal of Earthquake Engineering, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:The reliability-based design of tuned mass damper considering system parameters uncertainties is noteworthy. However, the same is not the case for liquid dampers. The present study deals with the reliability-based design of tuned liquid column dampers under random Earthquake considering system parameters uncertainties. Using the conditional second-order information of response quantities, the total probability concept is applied to evaluate the unconditional failure probability which is subsequently used as the objective function to obtain the damping parameters. A numerical study elucidates the effect of system parameters uncertainties on the damper parameters optimization and safety of the structure.
Rama Debbarma - One of the best experts on this subject based on the ideXlab platform.
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optimum design of tuned liquid column dampers under stochastic Earthquake Load considering uncertain bounded system parameters
International Journal of Mechanical Sciences, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:Abstract The Tuned Liquid Column Damper (TLCD) is an effective alternative to the Tuned Mass Damper (TMD) to reduce the response of structures due to dynamic Loads. The optimum TLCD parameters are normally obtained based on the implicit assumption that the system parameters involved are deterministic. But, the efficiency of dampers may reduce if the TLCD parameters are not tuned to the vibrating mode it is designed to suppress due to the unavoidable presence of system parameter uncertainty. The study of TMD parameters’ optimization considering random system parameters is noteworthy. But, the same is not the case for liquid dampers. Moreover, though the damper parameters optimization under uncertain parameters in probabilistic framework is powerful; the approach cannot be applied in many real situations when the required detailed information to describe the parameters in probabilistic format is limited. In present work, the TLCD parameters optimization to control vibration of structures subjected to stochastic Earthquake Load under uncertain system parameters modeled as uncertain but bounded (UBB) type is studied. With the aid of matrix perturbation theory using first-order Taylor series expansion and interval extension of the dynamic response function, the vibration control problem is transformed to appropriate deterministic optimization problems yielding the lower and upper bound solution. Numerical study is performed to elucidate the effect of parameters’ uncertainties on the optimization of damper parameters and the performance of TLCD.
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unconditional reliability based design of tuned liquid column dampers under stochastic Earthquake Load considering system parameters uncertainties
Journal of Earthquake Engineering, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:The reliability-based design of tuned mass damper considering system parameters uncertainties is noteworthy. However, the same is not the case for liquid dampers. The present study deals with the reliability-based design of tuned liquid column dampers under random Earthquake considering system parameters uncertainties. Using the conditional second-order information of response quantities, the total probability concept is applied to evaluate the unconditional failure probability which is subsequently used as the objective function to obtain the damping parameters. A numerical study elucidates the effect of system parameters uncertainties on the damper parameters optimization and safety of the structure.
Subrata Chakraborty - One of the best experts on this subject based on the ideXlab platform.
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optimum design of tuned liquid column dampers under stochastic Earthquake Load considering uncertain bounded system parameters
International Journal of Mechanical Sciences, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:Abstract The Tuned Liquid Column Damper (TLCD) is an effective alternative to the Tuned Mass Damper (TMD) to reduce the response of structures due to dynamic Loads. The optimum TLCD parameters are normally obtained based on the implicit assumption that the system parameters involved are deterministic. But, the efficiency of dampers may reduce if the TLCD parameters are not tuned to the vibrating mode it is designed to suppress due to the unavoidable presence of system parameter uncertainty. The study of TMD parameters’ optimization considering random system parameters is noteworthy. But, the same is not the case for liquid dampers. Moreover, though the damper parameters optimization under uncertain parameters in probabilistic framework is powerful; the approach cannot be applied in many real situations when the required detailed information to describe the parameters in probabilistic format is limited. In present work, the TLCD parameters optimization to control vibration of structures subjected to stochastic Earthquake Load under uncertain system parameters modeled as uncertain but bounded (UBB) type is studied. With the aid of matrix perturbation theory using first-order Taylor series expansion and interval extension of the dynamic response function, the vibration control problem is transformed to appropriate deterministic optimization problems yielding the lower and upper bound solution. Numerical study is performed to elucidate the effect of parameters’ uncertainties on the optimization of damper parameters and the performance of TLCD.
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unconditional reliability based design of tuned liquid column dampers under stochastic Earthquake Load considering system parameters uncertainties
Journal of Earthquake Engineering, 2010Co-Authors: Rama Debbarma, Subrata Chakraborty, S GhoshAbstract:The reliability-based design of tuned mass damper considering system parameters uncertainties is noteworthy. However, the same is not the case for liquid dampers. The present study deals with the reliability-based design of tuned liquid column dampers under random Earthquake considering system parameters uncertainties. Using the conditional second-order information of response quantities, the total probability concept is applied to evaluate the unconditional failure probability which is subsequently used as the objective function to obtain the damping parameters. A numerical study elucidates the effect of system parameters uncertainties on the damper parameters optimization and safety of the structure.
Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.
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experimental behavior of gfrp reinforced concrete squat walls subjected to simulated Earthquake Load
Journal of Composites for Construction, 2018Co-Authors: Ahmed Arafa, Ahmed Sabry Farghaly, Brahim BenmokraneAbstract:AbstractThis study addressed the feasibility of reinforced-concrete squat walls totally reinforced with glass fiber-reinforced polymer (GFRP) bars achieving the strength and drift requirements spec...
Jitendra Pratap Singh - One of the best experts on this subject based on the ideXlab platform.
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behavior of gravity type retaining wall under Earthquake Load with generalized backfill
Journal of Earthquake Engineering, 2015Co-Authors: Indrajit Chowdhury, Jitendra Pratap SinghAbstract:Dynamic response of gravity type retaining wall under seismic Load is a topic of considerable research for the last 90 years or more. The concept of deriving dynamic pressure based on rigid body mechanics as proposed by Mononobe and Okabe (M-O method) in 1929 continues to dominate the majority of the codes around the world, although it is reported in a number of cases that the M-O method underestimates the response in many cases. Although the M-O method was originally derived for cohesion less soil yet it is used frequently in deriving pressure for other general soil conditions also, like c-φ soil, c-φ soil with surcharge, etc.This article is an attempt to predict the response of a gravity wall having a generalized backfill (i.e., c-φ soil with surcharge q and that could also be partially saturated) considering its structural deformation as well as the effect of dynamic soil structure interaction (DSSI), a phenomenon which is often ignored in practice. The results are finally compared with a 2-D finite el...
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performance evaluation of gravity type retaining wall under Earthquake Load
Indian Geotechnical Journal, 2014Co-Authors: Indrajit Chowdhury, Jitendra Pratap SinghAbstract:Gravity retaining walls, especially with improvement of RCC structures though have become more or less obsolete in terms of construction (replaced by RCC cantilever and counter fort type retaining walls), yet in India, there exists a number of them that has been built in the past in many strategically important places (both post and pre independence). Evaluating their health in terms of a future strong motion Earthquake remains an important exercise—now that our understanding of this fury of mother nature is far more profound. Unfortunately tools available to assess its behavior as realistically as possible under seismic force even today is quite limited, marred by idealization, that are unrealistic and may not reflect correctly the actual behavior in reality, and this needs a serious evaluation. In Indian context, the only tool available to assess a gravity type retaining wall’s performance is by Mononobe and Okabe Method (M–O method), that continue to dominate IS code, notwithstanding the fact that many countries including US has now abandoned the method, as it has now been proved beyond any dispute that M–O method gives a lower bound solution than reality. Present paper tries to address some of these shortcomings as proposed above and come up with a mathematical model that is more realistic, and which may be used for performance evaluation of such gravity retaining walls under future Earthquakes. Finally, the paper suggests some practical strengthening measure that may be undertaken to enhance these walls performance—where to the author’s perception if re-evaluated, many of them would be found unsafe in context to present Earthquake code.
