Fuzzy‐sliding mode control of nonlinear smart base‐isolated building under earthquake excitation

Ghaffarzadeh, Hosein; Ghaffari, Amir Hossein; Yang, Tianliang

doi:10.1002/tal.1557

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…While in the horizontal direction, isolation rubber bearings were simulated by link element, and the Bouc-Wen model was used. [24,25] The Bouc-Wen model are shown in the Equations 1 and 2, where k is initial stiffness of rubber bearing before yielding; F y is yield force of rubber bearing; γ is ratio of tangent stiffness after yielding to initial elastic stiffness; s is parameter determining the shape of yield position curve; α and β are parameters 2 and 3, respectively. Based on the parameters in Tables 2 and 3, the specific parameters for Bouc-Wen and parallel element could be defined.…”

Section: Information Of Finite Element Modelsmentioning

confidence: 99%

Investigations on train‐induced vibration and vibration control of an over‐track building using thick‐layer rubber bearings

Zhou

Chen

et al. 2021

Structural Design Tall Build

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A large number of over-track buildings have been designed in metropolis during the recent decades for adapting to rapid urbanization and saving land resources. However, the over-track buildings are potentially affected by train-induced vibration that may cause discomfort or health problem for residents, which in turn needs to be carefully evaluated. In this study, the responses of a high-rise over-track building with three different transfer types have been investigated using the recorded threedimensional accelerations from in-situ tests. By performing time history analyses, the vibration responses of the fixed structure, traditional rubber bearing (TrRB) isolated, and thick-layer rubber bearing (ThRB) isolated structures are analyzed and evaluated, respectively. The results show that the most evident vibration is in the vertical direction with vibration energy mainly concentrated among the high frequencies. Thereafter, the effects of vibration control by using different isolation technologies are compared. It is demonstrated that the abilities to isolate vertical train-induced vibration could be enhanced by using ThRB while the horizontal isolation performance is still guaranteed. Then the reason for the variation of vibration amplitude along the building height is discussed. This research enriches the train-induced vibration database and exemplifies the vibration mitigation control and design for over-track buildings.

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Section: Information Of Finite Element Modelsmentioning

confidence: 99%

Investigations on train‐induced vibration and vibration control of an over‐track building using thick‐layer rubber bearings

Zhou

Chen

et al. 2021

Structural Design Tall Build

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“…At the same time, most time series models take the improvement of forecast accuracy as the only goal. However, in practical problems, not only does the model need to predict correctly, but the model data is also transparent, which can explain the forecast results [9].…”

Section: Sustainable Development Of Smart Citiesmentioning

confidence: 99%

Complexity of the Analysis of Financial Cloud Based on Fuzzy Theory in the Wisdom of Sustainable Urban Development

2021

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With the rapid growth of our country’s economy, fuzzy theory has become more and more widely used in the financial field. This research mainly explores the application of financial cloud based on fuzzy theory in the sustainable development of smart cities. This research will apply the related knowledge of fuzzy theory, combine the traditional information system risk assessment thought and cloud computing system risk assessment, and propose a series of risk assessment models for the cloud computing system. First, design a smart city model to analyze the potential security issues of the financial cloud computing system. The security level model of cloud computing establishes an index system for evaluation objects based on the level of the security model and uses expert evaluation methods to build models for all levels of the risk profile through the analysis-level process and establish a fuzzy relationship model for each evaluation object value. We objectively evaluate the smart city model based on the designed financial cloud platform. Then, specific statistical analysis is performed on the fuzzy relationship model corresponding to the weight value of the evaluation object, the calculation result is finally obtained, and the risk assessment report of the financial cloud computing system is provided. For every 2% increase in trade dependence, the informatization level of smart cities will drop by about 0.03% on average. The findings have long strengthened the overall coordinated development of the financial system, optimized the financial structure, improved development efficiency, promoted close integration of science and technology and finance, and played the role of government leader it was to fulfill. It shows that we need to maximize it and improve the informatization when building smart cities. The level of development is very important for accelerating urban construction.

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“…Due to reducing the structural responses and repelling the destructive effects on different elements of structure, the use of dampers is inevitable. [ 1–3 ] Some dampers are used for the control of the responses of structures such as TMD dampers. [ 4–7 ] These types of dampers work by frequency and can help decrease the responses of the structures.…”

Section: Introductionmentioning

confidence: 99%

Mine blast‐induced ground motion response reduction using semi‐active devices

Ghaffari

Ghaffarzadeh

2023

Structural Design Tall Build

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Summary The aim of this paper is reducing the responses of structures under the mine blast‐induced ground motion by using semi‐active tools. In other words, the objective of this study is to provide a method to reduce the destructive effects of underground mine‐blast excitation. Investigating the behavior of structures under the mine blast excitation is essential because some buildings are subjected to the blast load of mines due to the rapid urbanization in different regions. Also, the importance of studying this excitation, based on the distinctive nature of mine blast‐induced underground motion, becomes more apparent. For proper investigation and comparison of responses, a seismic excitation is considered. To reduce the responses of two proposed shear structures, magnetorheological (MR) and orifice dampers are utilized. The optimum location for these dampers is investigated. To generate the optimal force each time step the clipped‐optimal algorithm is used based on the input force. The control force can be changed by adjusting the input voltage and magnetic field of dampers. In this research, structural responses based on optimal and maximum voltage are scrutinized. The results indicated that the proposed method is appropriate for reducing the responses of structures under the mine blast‐induced ground motion and seismic excitation.

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Fuzzy‐sliding mode control of nonlinear smart base‐isolated building under earthquake excitation

Cited by 5 publications

References 27 publications

Investigations on train‐induced vibration and vibration control of an over‐track building using thick‐layer rubber bearings

Investigations on train‐induced vibration and vibration control of an over‐track building using thick‐layer rubber bearings

Complexity of the Analysis of Financial Cloud Based on Fuzzy Theory in the Wisdom of Sustainable Urban Development

Mine blast‐induced ground motion response reduction using semi‐active devices

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