Novel procedure for reliability-based cost optimization of seismically isolated structures for the protection of critical equipment: A case study using single curved surface sliders

Abstract

SummaryThe optimized reliability-based design of seismic isolated structures requires a consideration of the failure probability of the system, in addition to the optimization objectives. The stochastic nature of a given system (e.g., the probable input ground motion) must therefore be properly included in the analysis model. To address this challenge, a novel procedure is developed and examined on a 3-story isolated concrete building model, to minimize the total construction cost of the system with regards to protecting sensitive equipment located within the structure.In this procedure, the structure performance and reliability were first evaluated using time-consuming Monte Carlo simulations. We then employed artificial neural networks as a response surface to facilitate the prediction of the failure probability for the supposed structure. To simulate seismic excitations, we generated artificial ground motion combining random high-frequency and long-period components.Also, a newly developed sensitivity analysis method was used to identify the critical uncertain parameters of the system. Finally, by using a simulated annealing algorithm, we determined the optimal design variables of the structure and isolation system for a range of desired probabilities of failure.The optimal results indicate that, for different target failure probability ranges, some design variables are more significant than others. KEYWORDS base isolation, critical equipment protection, neural network, reliability based cost optimization, sensitivity analysis, spectral non-stationarity

Performance evaluation of base-isolated structures with sliding hydromagnetic bearings

“…The earlier efforts significantly prompted the development of base‐isolation theory and technologies. In addition to the laminated rubber bearing, a variety of base‐isolation technologies, such as the friction sliding bearings (FSB), the curved surface slider (CSS), combined and hybrid isolation systems, and smart base‐isolation systems, are widely used in practice.…”

Seismic Performance of Base-Isolated Precast Concrete Shear Wall Structure with AHW Connections

“…Over the years, many studies have dealt with reliability analysis and reliability-based optimization of base-isolated systems including uncertainties such as isolation device properties and ground motion characteristics [15][16][17]. The results indicate that base isolation technology can improve the seismic reliability of structures subjected to earthquakes [18][19][20]. Lead-rubber bearing (LRB) is one of the most useful isolation devices in practice.…”

Utility of probability density evolution method for experimental reliability-based active vibration control

“…The PDEM is of great importance, and it is utilized in some theoretical engineering investigations during the recent years, but a scarcity of experimental investigations can be remarkably sensed for this method. An evaluated life assessment method could be beneficial for further applications such as design optimization regarding the expected lifetime of a system . In this regard, the current research has shaped to develop a novel method for integrated system identification (SI), reliability assessment, and control of structures based on structural health monitoring (SHM) data.…”

“…An evaluated life assessment method could be beneficial for further applications such as design optimization regarding the expected lifetime of a system. [25] In this regard, the current research has shaped to develop a novel method for integrated system identification (SI), reliability assessment, and control of structures based on structural health monitoring (SHM) data.The current study develops a new practical scheme for online reliability estimation via PDEM and simultaneously performs reliability-based AVC of structure using the optimal control strategy in which the weighting matrices are optimized via a heuristic algorithm. This objective made it essential to perform experimental validation tests for the proposed PDEM-based Structural Reliability Prediction (PSRP) method.…”

“…An evaluated life assessment method could be beneficial for further applications such as design optimization regarding the expected lifetime of a system. [25] In this regard, the current research has shaped to develop a novel method for integrated system identification (SI), reliability assessment, and control of structures based on structural health monitoring (SHM) data.…”