Fragility Analysis of Horizontal Pressure Vessels in the Coupled and Uncoupled Case

2016 ◽  
Author(s):  
Jonas Korndörfer ◽  
Benno Hoffmeister ◽  
Markus Feldmann
Keyword(s):  
Pressure Vessel ◽  
Risk Model ◽  
Fragility Curves ◽  
Pressure Vessels ◽  
Quantitative Risk Assessment ◽  
Fragility Analysis ◽  
Seismic Demand ◽  
Limit States ◽  
Common Component ◽  
Probabilistic Seismic Demand

The European project “INDUSE-2-SAFETY” aims for the development of a quantitative risk assessment methodology for seismic loss prevention of “special risk” petrochemical plants and components. To demonstrate the capabilities of this approach, a representative case study containing typical components is subjected to detailed investigation. Probabilistic seismic models are used to establish a relation between seismic demand and structural performance of the components with respect to relevant limit states. The resulting fragility curves are used as input for the quantitative risk model. The study at hand focusses on the fragility analysis of a horizontal steel pressure vessel, which represents a common component type in (petrochemical) plants. Prior to performing the fragility analysis, the dynamic characteristics as well as the pushover behaviour of the vessel are investigated in detail. In order to allow for transient dynamic analyses with reasonable computational resources, a simplified model of the pressure vessel is derived. For the probabilistic seismic demand analysis, the so-called cloud method is applied, using 26 seismic records subdivided into three different groups. The influence of different variables, in particular the liquid filling height and the coupling conditions, on the fragility is investigated in greater detail.

scholarly journals Fragility Analyses of Bridge Structures Using the Logarithmic Piecewise Function-Based Probabilistic Seismic Demand Model

2021 ◽  
Vol 13 (14) ◽  
pp. 7814
Author(s):  
Yinghao Zhao ◽  
Hesong Hu ◽  
Lunhua Bai ◽  
Mengxiong Tang ◽  
Hang Chen ◽  
...  
Keyword(s):  
Fragility Curves ◽  
Statistical Significance ◽  
Seismic Intensity ◽  
Fragility Analysis ◽  
Seismic Demand ◽  
Demand Model ◽  
Intensity Measure ◽  
System Fragility ◽  
Probabilistic Seismic Demand ◽  
Seismic Demand Model

Seismic fragility analysis is an efficient method to evaluate the structural failure probability during earthquake events. Among the existing fragility analysis methods, the probabilistic seismic demand model (PSDM) and the joint probabilistic seismic demand model (JPSDM) are generally used to compute the component and system fragility, respectively. However, the statistical significance behind the parameters related to the current PSDM and JPSDM are not comparable. Aside from that, when calculating the system fragility, the Monte Carlo sampling (MCS) method is time-consuming. To solve the two flaws, in this paper, the logarithm piecewise functions were used to generate the PSDM and the JPSDM, and the MCS was replaced by the univariate conditioning approximation (UCA) method. The concepts and application procedures of the proposed fragility analysis methods were elaborated first. Then, the UCA method was illustrated in detail. Finally, fragility curves of a steel arch truss case study bridge were generated by the proposed method. The research results indicate the following: (1) the proposed methods unify the data sources and statistical significance of the parameters used in the PSDM and the JPSDM; (2) the logarithmic piecewise function-based PSDM sensitively reflects the changing trend of the component’s demand with the fluctuation of the seismic intensity measure; (3) under transverse seismic waves, major injuries happen on the side bearings of the bridge, while slight damage may occur on each pier, and as the seismic intensity measure increases, the side bearings are more likely to be damaged; (4) for the severe damage and the absolute damage of the studied bridge, the system fragility curves are closer to the upper failure bounds; and (5) compared with the MSC method, the accuracy of the UCA method can be guaranteed with less calculation time.

Displacement-Based Fragility Curves for Seismic Assessment of Adobe Buildings in Cusco, Peru

2012 ◽  
Vol 28 (2) ◽  
pp. 759-794 ◽  
Author(s):  
Nicola Tarque ◽  
Helen Crowley ◽  
Rui Pinho ◽  
Humberto Varum
Keyword(s):  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Response Spectrum ◽  
Limit State ◽  
Seismic Demand ◽  
Limit States ◽  
Plane Failure ◽  
Displacement Capacity ◽  
Out Of Plane ◽  
Displacement Based

The seismic vulnerability of single-story adobe dwellings located in Cusco, Peru, is studied based on a mechanics-based procedure, which considers the analysis of in-plane and out-of-plane failure mechanisms of walls. The capacity of each dwelling is expressed as a function of its displacement capacity and period of vibration and is evaluated for different limit states to damage. The seismic demand has been obtained from several displacement response spectral shapes. From the comparison of the capacity with the demand, probabilities of limit state exceedance have been obtained for different PGA values. The results indicate that fragility curves in terms of PGA are strongly influenced by the response spectrum shape; however, this is not the case for the derivation of fragility curves in terms of limit state spectral displacement. Finally, fragility curves for dwellings located in Pisco, Peru, were computed and the probabilities of limit state exceedance were compared with the data obtained from the 2007 Peruvian earthquake.

scholarly journals Fragility Curves and Probabilistic Seismic Demand Models on the Seismic Assessment of RC Frames Subjected to Structural Pounding

2021 ◽  
Vol 11 (17) ◽  
pp. 8253
Author(s):  
Maria G. Flenga ◽  
Maria J. Favvata
Keyword(s):  
Fragility Curves ◽  
Seismic Demand ◽  
Rc Structures ◽  
Structural Pounding ◽  
Rc Frames ◽  
Rc Structure ◽  
Demand Models ◽  
Probabilistic Seismic Demand ◽  
Displacement Based ◽  
The Impact

This study aims to evaluate five different methodologies reported in the literature for developing fragility curves to assess the seismic performance of RC structures subjected to structural pounding. In this context, displacement-based and curvature-based fragility curves are developed. The use of probabilistic seismic demand models (PSDMs) on the fragility assessment of the pounding risk is further estimated. Linear and bilinear PSDMs are developed, while the validity of the assumptions commonly used to produce a PSDM is examined. Finally, the influence of the PSDMs’ assumptions on the derivation of fragilities for the structural pounding effect is identified. The examined pounding cases involve the interaction between adjacent RC structures that have equal story heights (floor-to-floor interaction). Results indicate that the fragility assessment of the RC structure that suffers the pounding effect is not affected by the examined methodologies when the performance level that controls the seismic behavior is exceeded at low levels of IM. Thus, the more vulnerable the structure is due to the pounding effect, the more likely that disparities among the fragility curves of the examined methods are eliminated. The use of a linear PSDM fails to properly describe the local inelastic demands of the structural RC member that suffers the impact effect. The PSDM’s assumptions are not always satisfied for the examined engineering demand parameters of this study, and thus may induce errors when fragility curves are developed. Nevertheless, errors induced due to the power law model and the homoscedasticity assumptions of the PSDM can be reduced by using the bilinear regression model.

On the Seismic Fragility Assessment of Concrete Gravity Dams in Eastern Canada

2019 ◽  
Vol 35 (1) ◽  
pp. 211-231 ◽  
Author(s):  
Rocio Segura ◽  
Carl Bernier ◽  
Ricardo Monteiro ◽  
Patrick Paultre
Keyword(s):  
Ground Motion ◽  
Fragility Curves ◽  
Limit State ◽  
Selection Method ◽  
Probabilistic Methods ◽  
Fragility Analysis ◽  
Gravity Dams ◽  
Limit States ◽  
Eastern Canada

In recent years, probabilistic methods, such as fragility analysis, have emerged as reliable tools for the seismic assessment of dam-type structures. These methods require the selection of a representative suite of ground motion records, resulting in the need for a ground motion selection method that includes all the relevant ground motion parameters in the fragility analysis of this type of structure. This article presents the development of up-to-date fragility curves for the sliding limit states of gravity dams in Eastern Canada using a record selection method based on the generalized conditional intensity measure approach. These fragility functions are then combined with the recently developed regional hazard data to evaluate the annual risk, which is measured in terms of the unconditional probability of limit state exceedance. The proposed methodology is applied to a case study dam in northeastern Canada, whose fragility is assessed through comparison with previous studies and current safety guidelines. It is observed that the more accurate procedure proposed herein produces less conservative fragility estimates for the case study dam.

Seismic Fragility Analysis of Base-Isolated LNG Storage Tank for Selecting Optimum Friction Material of Friction Pendulum System

2019 ◽  
Vol 13 (02) ◽  
pp. 1950010 ◽  
Author(s):  
Ji-Su Kim ◽  
Jung Pyo Jung ◽  
Ji-Hoon Moon ◽  
Tae-Hyung Lee ◽  
Jong Hak Kim ◽  
...  
Keyword(s):  
Fragility Curves ◽  
Friction Material ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Limit States ◽  
Frictional Material ◽  
Pendulum System ◽  
Frictional Coefficients ◽  
Friction Pendulum ◽  
Friction Pendulum System

The objective of this study is to establish a system for selecting the optimum friction material to meet the seismic performance requirements of a liquefied natural gas tank with a friction pendulum system (FPS). A methodology for determining the optimum frictional material using seismic fragility analysis is suggested, and it is applied to materials with various frictional coefficients for FPS. Seismic fragility curves with two different limit states are developed to determine the optimum friction material, and a methodology for combining fragility curves is proposed. The analysis shows that a lower friction coefficient for FPSs is more appropriate for preventing failure in FPSs and the superstructure investigated in this study.

SVM Based Seismic Fragility Analysis for RC Isolated Continuous Girder Bridge

2013 ◽  
Vol 800 ◽  
pp. 229-235 ◽  
Author(s):  
Xiao Hong Long ◽  
Bei Lei Chen ◽  
Jian Jun Li
Keyword(s):  
Fragility Curves ◽  
Longitudinal Direction ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Research Report ◽  
Lateral Direction ◽  
Probabilistic Seismic Demand Analysis ◽  
Continuous Girder Bridge ◽  
Probabilistic Seismic Demand ◽  
Girder Bridge

Because the fragility analysis methods used in recent years have some disadvantages to some extent, and there is no relative research report on the seismic fragility of structures based on SVM algorithm, nonparametric analytical method is used in the probabilistic seismic demand analysis, and fragility curves of RC isolated continuous bridge are obtained based on SVM Method. It turns out that the analytical results of SVM Method and Cloud Method are different in the longitudinal direction, matched in the lateral direction, and the results of the former method are greater than the latter one. It is a new and meaningful research that is more efficient than IDA method and also reliable.

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