scholarly journals Ground motion following selection of SRS design basis earthquake and associated deterministic approach

1991 ◽  
Author(s):  
◽  
Keyword(s):  
Ground Motion ◽  
Deterministic Approach ◽  
Design Basis ◽  
Selection Of

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2017 ◽  
pp. 112-127 ◽  
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

A Comparative Investigation of Structural Performance of Typical and Non-Ducitle Public RC Buildings Strengthened Using Friction Dampers and RC Walls

2019 ◽  
pp. 1073-1089
Author(s):  
Erkan Akpinar ◽  
Seckin Ersin
Keyword(s):  
Ground Motion ◽  
Comparative Investigation ◽  
Rc Buildings ◽  
Post Intervention ◽  
Friction Dampers ◽  
History Analysis ◽  
Response History Analysis ◽  
Nonlinear Static ◽  
Selection Of

Strengthening of non-ductile public buildings is a never-ending issue. Selection of the suitable strengthening method and appropriate analysis type for the assessment of pre- and the post-intervention performances are still open to question. The displacement or drift limitations are crucial as well as demand capacity ratios for determination of such buildings performance under severe ground motion. In this chapter, an investigation of seismic performance focused on displacement criterion of strengthened non-ductile public RC buildings in Turkey is presented. Both the nonlinear static and response history analysis were conducted. Friction dampers which are fairly modern technique and conventional RC wall implementation method were introduced to as-is building. For the simplicity and the easy of the process, 2D frame selected for investigation. Comparison of the aforementioned techniques for non-ductile public RC buildings and performances particularly by means of displacement obtained using different methods for those investigated schemes are carried out and presented in the chapter.

Development of a Risk-Informed IST Program at Palisades Using Top Event Prevention

2002 ◽  
Author(s):  
Robert A. White ◽  
David P. Blanchard
Keyword(s):  
Nuclear Power ◽  
Deterministic Approach ◽  
Testing Methods ◽  
Service Testing ◽  
Risk Ranking ◽  
Safety Consideration ◽  
Defense In Depth ◽  
Traditional Approaches ◽  
Ranking Technique ◽  
Selection Of

At the Palisades Nuclear Power Plant, a review of systems, structures and components is being performed for a variety of risk-informed applications. Among these applications is the In-Service Testing program developed under Section XI of the ASME Boiler and Pressure Vessel Code. In reviewing the scope of the IST program, a relatively new risk ranking technique is being utilized called Top Event Prevention (TEP). TEP differs from more traditional methods of risk ranking in that it uses defense-in-depth methods to select what SSCs are important to safety. The results of the TEP analysis are also somewhat unique as compared to more traditional approaches in that combinations of equipment important to safety are identified as opposed to determining importance one component at a time. In addition, entire paths or trains of equipment are identified as being required to manage safety. Furthermore, the components identified in the selected trains are minimal. That is, TEP identifies the minimum set of equipment modeled in the PRA that is necessary to manage safety. Because TEP provides a structured, deterministic approach to selection of components that are important to managing safety, consideration is being given to classifying pumps and valves into one of three safety categories; high safety significant components, low safety significant components and a third non safety significant category. The first two categories of safety significance are similar to those already defined in Regulatory Guide 1.175 [1], and will identify where current testing methods remain appropriate while suggesting those components for which testing intervals can be extended. The third or non-safety significant category has been established to identify those pumps and valves to which the PRA and safety are insensitive. Preliminary results from the TEP analysis of the Palisades IST scope suggest that of the more than 500 pumps and valves modeled in the PRA, just under one third are not important from a defense-in-depth perspective. Probabilistic testing of these approximately 140 components shows that risk as modeled by the PRA is not dependent on the reliability of these components. This suggests that the PRA is relatively insensitive to the reliability of these components collectively and that they can be considered as candidates for significant relaxation of testing requirements, possibly including exclusion from the formal IST program.

scholarly journals Current Challenges and Future Trends in Analytical Fragility and Vulnerability Modeling

2019 ◽  
Vol 35 (4) ◽  
pp. 1927-1952 ◽  
Author(s):  
Vitor Silva ◽  
Sinan Akkar ◽  
Jack Baker ◽  
Paolo Bazzurro ◽  
José Miguel Castro ◽  
...  
Keyword(s):  
Ground Motion ◽  
Empirical Data ◽  
Current Practice ◽  
Earthquake Damage ◽  
Future Trends ◽  
Risk Estimates ◽  
Ground Motion Records ◽  
Vulnerability Functions ◽  
Selection Of

The lack of empirical data regarding earthquake damage or losses has propelled the development of dozens of analytical methodologies for the derivation of fragility and vulnerability functions. Each method will naturally have its strengths and weaknesses, which will consequently affect the associated risk estimates. With the purpose of sharing knowledge on vulnerability modeling, identifying shortcomings in the existing methods, and recommending improvements to the current practice, a group of vulnerability experts met in Pavia (Italy) in April 2017. Critical topics related to the selection of ground motion records, modeling of complex real structures through simplified approaches, propagation of aleatory and epistemic uncertainties, and validation of vulnerability results were discussed, and suggestions were proposed to improve the reliability and accuracy in vulnerability modeling.

A Selection of GMPEs for the United Kingdom Based on Instrumental and Macroseismic Datasets

2019 ◽  
Vol 109 (4) ◽  
pp. 1378-1400 ◽  
Author(s):  
Manuela Villani ◽  
Barbara Polidoro ◽  
Rory McCully ◽  
Thomas Ader ◽  
Ben Edwards ◽  
...  
Keyword(s):  
United Kingdom ◽  
Ground Motion ◽  
Statistical Tests ◽  
Stochastic Simulations ◽  
Motion Prediction ◽  
Ground Motion Prediction ◽  
Ground Acceleration ◽  
The United Kingdom ◽  
Moderate Seismicity ◽  
Selection Of

Abstract In countries with low‐to‐moderate seismicity, the selection of appropriate ground‐motion prediction equations (GMPEs) to be used in a probabilistic seismic hazard analysis (PSHA) is a challenging step. Empirical observations of ground motion are limited, and GMPEs, when available, are generally based on stochastic simulations or adjusted empirical GMPEs from elsewhere. This article investigates the suitability of recent GMPEs to the United Kingdom. To this end, the spectral accelerations obtained from available instrumental ground‐motion data in the United Kingdom with magnitude lower than 4.5 are compared with the GMPEs’ predictions through the analysis of residuals and the application of statistical tests. To compensate for the scarcity of data for the magnitude range of interest in the PSHA, a macroseismic dataset is also considered. Macroseismic intensities are converted to peak ground acceleration (PGA) and statistically compared with the PGA predicted by the GMPEs. The GMPEs are then compared in terms of median ground‐motion prediction through Sammon’s maps to evaluate their similarities. The analyses from both datasets led to six suitable GMPEs, of which three are from the Next Generation Attenuation‐West2 project, one is European, one is based mainly on a Japanese dataset, and one is a stochastic GMPE developed specifically for the United Kingdom.

Evaluation of Hybrid Broadband Ground Motion Simulations for Response History Analysis and Design

2015 ◽  
Vol 31 (3) ◽  
pp. 1691-1710 ◽  
Author(s):  
Lynne S. Burks ◽  
Reid B. Zimmerman ◽  
Jack W. Baker
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Spectral Response ◽  
Analysis And Design ◽  
History Analysis ◽  
Response History Analysis ◽  
Simulated Ground Motions ◽  
Broadband Ground Motion ◽  
New Buildings ◽  
Selection Of

Chapter 16 of ASCE 7 governs the selection of ground motions for analysis of new buildings and requires recordings that meet specified criteria. If a sufficient number of recordings cannot be found, it allows the use of “appropriate simulated ground motions,” but does not provide further guidance. This paper outlines a procedure for generating and selecting a set of “appropriate” hybrid broadband simulations and a comparable set of recordings. Both ground motion sets are used to analyze a building in Berkeley, California, and the predicted structural performance is compared. The structural behavior resulting from recordings and simulations is similar, and most discrepancies are explained by differences in directional properties such as orientation of the maximum spectral response. These results suggest that when simulations meet the criteria outlined for recordings in ASCE 7 and properties such as directionality are realistically represented, simulations provide useful results for structural analysis and design.

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