Ground Motion Intensity Measures for Seismic Vulnerability Assessment of Steel Storage Tanks with Unanchored Support Conditions

2021 ◽  
Author(s):  
Hoang Nam Phan ◽  
Fabrizio Paolacci ◽  
Van My Nguyen ◽  
Phuong Hoa Hoang
Keyword(s):  
Comparative Study ◽  
Ground Motion ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Superior Performance ◽  
Spectral Acceleration ◽  
Storage Tanks ◽  
Intensity Measures ◽  
Seismic Vulnerability Assessment ◽  
Support Conditions

Abstract This paper aims to comprehensively evaluate the performance of a series of ground motion intensity measures (IMs) used in the seismic vulnerability assessment of steel storage tanks with unanchored support conditions. Sixteen well-known IMs are thus selected, which are classified into amplitude-, frequency-, and time-based categories. A comparative study is then performed on four different unanchored steel storage tanks subjected to a suite of 140 ground motion records that is comprised of seven different bins of records with different hazard levels. In this regard, the tanks are appropriately modeled based on a simplified approach, whose uplift and sliding nonlinear behaviors are properly implemented based on a three-dimensional nonlinear pushover analysis of the tanks. Four characteristics of the examined IMs including efficiency, practicality, proficiency, and sufficiency are evaluated based on a probabilistic seismic demand model of two critical failure modes of the tanks, i.e., plastic rotation of the shell-to-bottom connection and elephant's foot buckling of the shell plate. According to the comparative study, frequency-based IMs demonstrate their superior performance for all criteria compared with other groups; in particular, the average spectral acceleration gains the highest ranking. Finally, an appropriate range of the upper period considered in the average spectral acceleration IM is then proposed to optimize the efficiency of this IM for the examined tanks.

scholarly journals Seismic Vulnerability Assessment of a Reinforced Concrete Building Located in India

2019 ◽  
Vol 8 (11S) ◽  
pp. 310-314
Keyword(s):  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Equivalent Linearization ◽  
Spectral Acceleration ◽  
Damage State ◽  
Ground Acceleration ◽  
Seismic Vulnerability Assessment ◽  
Performance Point ◽  
Damage States

Over the recent years the natural disaster especially due to the earthquake effect on buildings increases which causes loss of life and property in many places all over the world. The latest development leads to finding the direct losses and damage states of the buildings for various intensities of earthquake ground motions. In the present study, seismic vulnerability assessment was done for a medium rise building (G+5). The design peak ground acceleration of 0.16g and 0.36g were considered for the risk assessment. The nonlinear static pushover analysis was done to fine the performance point, spectral acceleration and corresponding spectral acceleration by Equivalent Linearization (EL) method given by Federal Emergency Management Agency (FEMA-440). The four damage states such as slight, moderate, extreme and collapse has been considered as per HAZUS-MR4. The seismic vulnerability in terms of fragility curves was developed to evaluate the damage probabilities based on HAZUS methodology. The discrete and cumulative damage probability was found for all the damage states of the building which shows the building at 0.16g experience slight damage whereas at 0.36g the moderate damage state equally becomes predominant.

scholarly journals Ground Motion Model for Seismic Vulnerability Assessment of Prototype Industrial Plants

2021 ◽  
Author(s):  
Chiara Nardin ◽  
Rocco di Filippo ◽  
Roberto Endrizzi ◽  
Igor Lanese ◽  
Fabrizio Paolacci ◽  
...  
Keyword(s):  
Ground Motion ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Motion Model ◽  
Seismic Vulnerability Assessment ◽  
Industrial Plants ◽  
Ground Motion Model

Seismic Vulnerability Assessment of Fuel Storage Tanks in Italy

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Valerio De Biagi ◽  
Bernardino Chiaia ◽  
Luca Fiorentini ◽  
Cristina Zannini Quirini
Keyword(s):  
Risk Assessment ◽  
Seismic Hazard ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Seismic Load ◽  
Storage Tanks ◽  
Seismic Vulnerability Assessment ◽  
Fuel Storage ◽  
Normalized Parameters ◽  
The Masses

Seismic hazard represents one of the possible triggering causes for NaTech accidents in refineries and production plants. The vulnerability of steel storage tanks was evaluated within the framework of a rapid risk assessment. Tanks dataset is composed of 70 refinery items in located in various parts of Italy and the seismic calculations are performed in accordance to API 650 Annex E Standard. The paper summarizes the results of the investigation through two normalized parameters related to the masses and to the seismic load. Some trends in the solution are highlighted. The empirical fragility curve obtained from the analysis is compared with similar curves found in the literature and the resulting similarities (and dissimilarities) are critically discussed.

scholarly journals Ground Motion Model for Seismic Vulnerability Assessment of Prototype Industrial Plants

2020 ◽  
Author(s):  
Chiara Nardin ◽  
Igor Lanese ◽  
Rocco di Filippo ◽  
Roberto Endrizzi ◽  
Oreste S. Bursi ◽  
...  
Keyword(s):  
Ground Motion ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Ground Motions ◽  
Industrial Plant ◽  
Motion Model ◽  
Limit States ◽  
Seismic Vulnerability Assessment ◽  
Industrial Plants ◽  
Ground Motion Model

Abstract Relationships between seismic action, system response and relevant damage levels in industrial plants require a solid background both in experimental data, due to the high level of non-linearity and seismic input. Besides, risk and fragility analyses depend on the adoption of a huge number of seismic records usually not available in a site-specific analysis. In order to manage these issues and to gain knowledge on the definition of damage levels, limit states and performance for major-hazard industrial plant components, we present a possible approach for an experimental campaign based on a real prototype industrial steel structure. The investigation of the seismic behaviour of the reference structure will be carried out through shaking table tests. In particular, tests are focused on structural or process-related interactions that can lead to serious secondary damages as leakage in piping systems or connections with tanks and cabinets. The aforementioned test program has been possible thanks to the adoption of: i) a number of artificial spectrum-compatible accelerograms; ii) a ground motion model (GMM) able to generate a suite of synthetic time-histories records for specified site characteristic and earthquake scenarios. More precisely, GMM model parameters can be identified by matching the statistics of a target-recorded accelerogram to the ones of the model in terms of faulting mechanism, earthquake magnitude, source-to-site distance and site shear-wave velocity. As a result, the stochastic model, based both on these matched parameters and on filtered white-noise process, can generate the ensemble of synthetic ground motions capable of capturing the main features of real earthquake ground motions, including intensity, duration, spectral content and peak values. Moreover, the synthetic records are selected to target specific damages and limit states in industrial components. Finally, by means of the combination of artificial and synthetic accelerograms, a seismic vulnerability assessment of both the whole structure and relevant industrial components can be carried out.

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