Seismic fragility of flexible pipeline connections in a base isolated medical building

Shang, Qingxue; Wang, Tao; Li, Jichao

doi:10.1007/s11803-019-0542-5

Cited by 28 publications

(7 citation statements)

References 11 publications

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“…All other LS are above a PGA = 0.77 g, while the DS1-D is reached at PGA = 0.41 g. This PGA value would be the maximum horizontal PGA that the seismic protection system could experience with a 95% confidence of not exceeding the 5% probability of failure with no damage and linear behavior expected, as required by Design Category 5 (SDC-5) with an LS-D, according to ASCE/SEI-43-05 [21]. Figure 15b shows the results by modifying the pipeline LS (DS1-D mod ) at a limit equal to 224 mm, which represents a moderate damage state (equivalent to damage of broken meshes) [42]. The seismic protection system could perform at 146% of the previously defined maximum PGA.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

2022

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Nuclear power plants are required to maintain operation after an earthquake, leading to a safe shutdown if necessary. In the case of a loss of offsite power, the onsite emergency diesel generator is critical to ensure procedural operations of the nuclear power plant. As a means to reduce the overall seismic risk, a three-dimensional seismic protection system is proposed to enhance the seismic performance of the emergency diesel generator. The proposed seismic isolation system decouples the horizontal and vertical components of shaking and considers available hardware to achieve an effective isolation solution over the range of excitation frequencies considered. Numerical analysis of the proposed system demonstrates a reduction in seismic demands on the emergency diesel generator and provides a higher safety margin than conventional base installation procedures. Umbilical lines that cross the isolation plane are considered and impose additional constraints on the displacement capacity of the isolation system. However, increasing the displacement capacity of these components can significantly increase the safety margin against failure. The seismic protection system can be customized depending on the seismic hazard and application to different seismic regions.

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Section: Resultsmentioning

confidence: 99%

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

2022

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“…Immediate functionality reduction for basic events was assumed to be related to loss and cost. Instead of DES or metamodels, a simplified way for waiting time estimation was proposed in Equation (19), where a linear relationship was assumed between the waiting time, the reduction in the number of staffed beds, and the increase in the number of patients. Bias may be introduced in these assessment results.…”

Section: Hybridmentioning

confidence: 99%

“…The functionality of hospitals was highly dependent on physical and human factors after earthquakes, including building damages of structural and nonstructural components, damages of utilities in hospitals and infrastructures outside hospitals, malfunction of medical equipment, emergency management, and staff 17–20 . Recent seismic events have caused serious effects on hospitals.…”

Section: Introductionmentioning

confidence: 99%

Resilience assessment methods for hospitals subjected to earthquakes: State of the art

Peng

Zhai

Liu

et al. 2022

Earthquake Engineering and Resilience

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Hospitals play essential roles in modern communities in the lives of people. During and after earthquakes, they are supposed to be resilient and provide continued medical and social services. Resilience assessment methods are essential for determining hospitals' resilience levels, and the results will provide a direct basis and foundation for the design of new hospitals and retrofit optimization of existing hospitals. This paper reviews the resilience assessment methods and performance measures for hospitals subjected to earthquakes. Current assessment methods are divided into indicator‐ and functionality‐based categories, and the performance measures for quantifying the functionality of hospitals are classified into availability, productivity, quality, and hybrid. This study will assist stakeholders and managers in understanding available assessment methods.

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“…The damage to NSCs can lead to substantial economic losses, both directly and indirectly, often surpassing the costs associated with the primary structural members. The damage to nonstructural components (NSCs), which encompass crucial and valuable equipment, can greatly interrupt the operations of diverse structures, especially vital facilities like airports, hospitals, and sites of historical or cultural significance [2][3]. These results emphasize the critical necessity of assessing the seismic behavior of components alongside structural elements.…”

Section: Introductionmentioning

confidence: 99%

Investigation on floor response spectra of a three-story building exposed to near- and far-field earthquakes

Pesaralanka,

Burugapalli,

Challagulla

2024

Res. Eng. Struct. Mat.

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Historical earthquakes highlighted structural collapses and non-structural component (NSC) failures. This study aims to analyze NSC behavior during near and far-field earthquakes in a three-story building by studying elastic and inelastic acceleration responses. The investigation delves into floor response spectra and analyzes how NSCs affect floor acceleration responses, aiming to understand the performance of these components. The findings from the analysis indicated that the Floor Response Spectra (FRS) consistently align peaks with elastic and inelastic modal periods. Inelastic FRS notably show reduced floor spectral accelerations compared to elastic FRS. Near-field earthquakes induce 25-30% higher floor acceleration demands in NSCs compared to far-field earthquakes. Peak Component Acceleration (PCA) values differ significantly between near and far field earthquakes, with near-field ones exhibiting notably higher values across all floors. Higher damping ratios in NSCs lead to decreased peaks in the Component Dynamic Amplification Factor (CDAF) spectrum. The inelastic model notably reduces peak values of CDAF by approximately 49.53% to 69.3% for near-field and 51.81% to 64.47% for far-field earthquakes compared to the elastic model. In summary, the examination of peak floor responses against the formulation based on building codes highlights variations, with instances where the formulation either underestimates or overestimates the peak response demands.

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Seismic fragility of flexible pipeline connections in a base isolated medical building

Cited by 28 publications

References 11 publications

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

Enhanced Seismic Protection System for an Emergency Diesel Generator Unit

Resilience assessment methods for hospitals subjected to earthquakes: State of the art

Investigation on floor response spectra of a three-story building exposed to near- and far-field earthquakes

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