Experimental and numerical analyses of variability in the responses of imperfect slender free rigid blocks under random dynamic excitations

Mathey, Charlie; Feau, Cyril; Clair, David St; Baillet, Laurent; Fogli, Michel

doi:10.1016/j.engstruct.2018.06.064

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…This inconsistency was mainly caused by imperfect boundary conditions at F I G U R E 9 Time histories of rotational velocity for variation of CG the interface between the specimen and the floor. [33,42,43,45] These trajectories were identical to those of the free rocking concrete block presented by ElGawady et al ( 2011), [33] where the density of the rocking orbit increased with the magnitude of h cg , indicating that the energy reduction decreased and more impacts were needed before the block came to rest.…”

Section: Rocking Responsesupporting

confidence: 75%

“…[ 56 ] The main cause was the imperfections at the interface of the rocking system. [ 33,42,43,45 ] This phenomenon was discovered in the experimental and analytical works of Lipscombe and Pellegrino (1993), ] 32 ] ElGawady et al. (2011), [ 33 ] Wittich and Hutchinson (2016), [ 46 ] and Kalliontzisa and Sritharan (2018).…”

Section: Test Resultsmentioning

confidence: 98%

“…[ 42 ] Under earthquake excitation, the probabilities of overturning and rocking slightly increased. [ 43 ] Konstantinidis and Makris (2010) [ 44 ] investigated the dynamic response of equipment to earthquake excitations. Owing to the limitations of the capacity of the shaking table, the dimensions of wooden blocks representing geometries identical to those of the equipment were scaled down to one‐fourth of its original dimensions.…”

Section: Introductionmentioning

confidence: 99%

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Free‐rocking tests of a freestanding object with variation of center of gravity

Huang

Pan

et al. 2021

Earthq Engng Struct Dyn

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Freestanding nonstructural objects are very common in various infrastructure systems, but their dynamic properties with variations in the center of gravity (CG) are not yet fully understood. To investigate the dynamic properties of a freestanding object as its CG is varied, a steel frame model was fabricated using movable steel plates. Two scenarios, with varying and fixed CG, were considered in the free rocking tests. The experimental rotation responses generally matched the analytical responses in the initial cycles, and the discrepancy increased as the height of the CG (hcg) increased. The magnitude of the quarter period exhibited a similar trend. When the CG was fixed, the resulting magnitude of the quarter period varied slightly with hcg, indicating that the CG is one of the primary parameters affecting the quarter period. When the CG was varied, the experimental energy reduction factor was generally larger than the analytical results computed using the methods suggested in the literature, and it was scattered around the fixed CG value. The magnitude of the damping ratio was also scattered as the quarter cycle number increased, and it slightly decreased as hcg increased. An equivalent rectangular rigid block model with an equivalent height (heq) was employed to compute the geometric and dynamic parameters of the steel frame. The accuracy of this measure was investigated in terms of the quarter period and energy reduction factor. This work is beneficial for understanding the rocking behavior of freestanding objects.

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Section: Rocking Responsesupporting

confidence: 75%

Section: Test Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Free‐rocking tests of a freestanding object with variation of center of gravity

Huang

Pan

et al. 2021

Earthq Engng Struct Dyn

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“…e informationization of PE teaching can improve the problems in PE teaching, making the PE classroom revolve around students and teachers play a coaching role. As the reform of physical education continues to deepen, it is an inevitable trend for the development of physical education curriculum to replace the traditional physical education teaching mode with information-based physical education teaching [4][5][6][7][8][9]. On this basis, to find out the shortcomings of the current development of information-based physical education and solve them is an important measure to promote the reform of traditional physical education curriculum [10].…”

Section: Introductionmentioning

confidence: 99%

Application of Random Dynamic Grouping Simulation Algorithm in PE Teaching Evaluation

Hao

2021

Complexity

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The probability ranking conclusion is an extension of the absolute form evaluation conclusion. Firstly, the random simulation evaluation model is introduced; then, the general idea of converting the traditional evaluation method to the random simulation evaluation model is analyzed; on this basis, based on the rule of “further ensuring the stability of the ranking chain on the basis of increasing the possibility of the ranking chain,” two methods of solving the probability ranking conclusion are given. Based on the rule of “further guaranteeing the stability of the ranking chain on the basis of improving the likelihood of the ranking chain,” two methods are given to solve the likelihood conclusion. This paper argues that this absolute form of conclusion hinders the approximation of the theory to the essence of the actual problem and is an important reason for the problem of “non-consistency of multi-evaluation conclusions.” To address this problem, a stochastic simulation-based comprehensive evaluation solution algorithm based on the idea of “Monte Carlo simulation” is proposed, and the corresponding ranking method is investigated, which is characterized by generating evaluation conclusions with probability (reliability) information, and thus has more advantages than the absolute conclusion form in terms of problem interpretability. The method is characterized by the generation of evaluation conclusions with probabilistic (reliability) information and thus has more advantages than the absolute conclusion form in terms of problem interpretation. Because of the independence of the stochastic simulation solution method, it is applied to the “bottom-up” evaluation model as an example, and a novel autonomous evaluation method is constructed. Finally, the application of the stochastic simulation evaluation model is illustrated by an example and compared with the absolute form evaluation. The evaluation model is an extension of the traditional evaluation model, which can further broaden the practical application of comprehensive evaluation theory.

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“…In this study, the FAA distribution profiles of the instrumented buildings in the California Strong Motion Instrumentation Program (CSMIP) were analyzed in order to develop a representative FAA distribution profile considering several parameters such as PGA, structural types, and heights. e developed profile was expected to be useful for the seismic design and experimental investigation of NCs [50][51][52][53][54] and to be applied in future code provisions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Floor Acceleration Amplification Demand of Instrumented Buildings

Huang

Liu

2021

Advances in Civil Engineering

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The floor acceleration amplification (FAA) factor is one of the most critical parameters in computing the equivalent seismic force of nonstructural component (NC). To evaluate the heightwise FAA distribution profile, the recorded acceleration response of the instrumented buildings was analyzed using the California Strong Motion Instrumentation Program (CSMIP) database. The FAA demands for three groups of buildings consisting of reinforced concrete, steel, and masonry buildings were analyzed. In each group, the buildings were classified into four subgroups according to their heights. Parabolic distribution profiles were suggested that could envelop most of the FAA data, as demonstrated by the processed results. An earthquake experience-based importance factor was suggested in terms of the percentage of the enveloped records. The obtained FAAs at the roof were generally larger than those in other levels. The percentile distributions of the roof acceleration amplification (RAA) were computed. The results showed that the roof FAA was underestimated in ASCE 7-16. The magnitudes of the FAA and the RAA correlated to the fundamental period of the building, which was considered by classifying the buildings according to the period ranges. The RAA profile against the period was obtained from a regression analysis. The developed FAA profile is expected to be useful in the seismic design of NCs, and it is expected to be adopted in future code provisions.

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Experimental and numerical analyses of variability in the responses of imperfect slender free rigid blocks under random dynamic excitations

Cited by 8 publications

References 15 publications

Free‐rocking tests of a freestanding object with variation of center of gravity

Free‐rocking tests of a freestanding object with variation of center of gravity

Application of Random Dynamic Grouping Simulation Algorithm in PE Teaching Evaluation

Evaluation of the Floor Acceleration Amplification Demand of Instrumented Buildings

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