seismic hazard analysis ppt

This research includes the development and example illustration ofa GIS-based methodology for quantifying and combining the hazards associated with these secondary site effects. PPT - State of Practice of Seismic Hazard Analysis: From ... About 65% of the total area of the country is vulnerable to seismic damage of buildings in varying degrees. - A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 451997-NmZiZ Basic theory of seismic waves traveling through the Earth and how they interact with earth materials and interfaces. Instead of using 2/3*MCE with higher m-factors, ASCE 41-13 chose to specify a lower seismic hazard intensity and use the same m-factors and analysis procedure as ASCE 41-06, with appropriate updates. 3. FEMA 451B Topic 5a Notes Seismic Hazard Analysis 11 Instructional Material Complementing FEMA 451, Design Examples Seismic Hazard Analysis 5a - 11 Attenuation with Distance Note the difference between site amplification and attenuation. Fragility curves and seismic demand hazard analysis of ... The probabilistic seismic performance is measured by fragility curves, that is, the Seismic hazard and risk analysis For over 30 years, research at the John A. Blume Earthquake Engineering Center has focused on seismic hazard and risk analysis. Seismic energy … . The main objective of this paper is to evaluate the methodologies for probabilistic seismic assessment in t erms of fragility assessment. 14 introduction to probabilistic seismic hazard analysis PPT Lecture 04 - USGS SEISMIC HAZARD. To illustrate with an example, one first estimates the annual probability of a nearby earthquake. This study describes a method wherein a design earthquake can be obtained that accurately . The PowerPoint PPT presentation: "From Seismic Hazard Analysis to Seismic Risk mitigation" is the property of its rightful owner. 1. For a long time seismic loads of this size remained in the majority of seismic codes worldwide. 7 McGuire, R. (1976). If you need to print pages from this book, we recommend downloading it as a PDF. Seismic Zonation and Hazard Analysis: Objectives & Highlights: Objectives & Highlights: 17: Seismic site characterization, site effects and liquefaction: Objectives & Highlights: Objectives & Highlights: 18: Seismic hazard parameters and zonation mapping: Objectives & Highlights: Objectives & Highlights: 17 Seismic Base Isolation It is a powerful and relatively cheaper method of seismic rehabilitation of buildings Advantages •Better protection against earthquake due to the decreasing of shears •Superstructure will need no reinforcement •Foundation system will not need any reinforcement to resist the overturning moments Unfortunately, this book can't be printed from the OpenBook. Check strength, deflection, and stability 1. Since then, engineers have adopted a more comprehensive approach to design known as Probabilistic Seismic Hazard Analysis (PSHA). * * * The seismic zone maps are created with a methodology known as probabilistic seismic hazard analysis (PSHA). In terms of seismic hazard: Low-rise buildings are susceptible to damage from high-frequency seismic waves from relatively near earthquakes and/or shallow depth High-rise buildings are at risk due to low-frequency seismic waves, which may have origi t d t h g t di t d/ l g iginated at much greater distance and/or large depth From Seismic Hazard Analysis to Seismic Risk mitigation - GSHAP: PSHA, 475 years return period. analysis, similar to or more complex than that required for design of a new building (Level 3 procedure). A primary purpose of a risk analysis is to identify and model the sources of uncertainty that af-fect the analysis and the quantification of the likelihood of future events of interest (e.g., uncon-trolled release of the reservoir). The PowerPoint PPT presentation: "Seismic Hazard and Seismic Risk" is the property of its rightful owner. Do you have PowerPoint slides to share? Probabilistic seismic hazard analysis (PSHA) is conducted because there is a perceived earthquake threat. Introduction It is a daunting task to try to convey the science of Seismic hazards can be analyzed deterministically as and when a particular earthquake scenario is assumed, or probabilistically, in which uncertainties in earthquake size, location, and time of occurrence are explicitly considered (Kramer, 1996). The methodology to alternative, seismic hazard analysis (SHA), utilizes earthquake science and statistics directly and provides a seismic hazard esti-mate that can be readily used for seismic risk assessment and other applications. These are quite different phenomena. Perform analysis Dr. Hazim DwairiDr. Formerly, a book, now available on CD-ROM, this title was written to be an introduction to the geologic interpretation of seismic data. Bulletin of the Seismological Society of America, vol. Thus, seismological-level analysis (i.e. in the seismic hazard used for a Tier 1 screening and Tier 2 evaluation. Normal Hazard Occupancy: except those Normal Hazard Occupancy: except those listed in categories II III IVlisted in categories II, III, IV Overview of Probabilistic Seismic Hazard Analysis. the high seismic hazard in India and highlights the need for a comprehensive earthquake . Structural Analysis and DesignDr. C4.4.1 Probabilistic Seismic Hazard Analysis (PSHA) ...202 C4.4.1.1.1 Getting PGA and PGV ...204 C4.4.2 Design Level PGA and PGV Values ...205 C4.5 FAULT OFFSET . State of Practice of Seismic Hazard Analysis: From the Good to the Bad EERI DISTINGUISHED LECTURE SERIES PFDHA) will produce hazard curves of the MARE given values of IM, typically PGA or S a (T 1 The fundamentals of Occupancy Category (IBC 2000) I.I. Introduction to Seismology Seismic Hazard Analysis 1 (pp.455-460) Department of Earth Sciences KFUPM Ali Oncel [email_address] Introduction to Seismology-KFUPM 2. -Completed Probabilistic Seismic Hazard Analysis (PSHA) culminating more than a decade of seismic hazard investigations in the Yucca Mountain area-Used PSHA results (hazard curves) as input to seismic effects scenarios in Total System Performance Assessment - Viability Assessment (TSPA-VA)-Developed methodology for determining seismic response • The objective of geophysics. PROBABILISTIC SEISMIC HAZARD ANALYSIS PSHA was developed in the 1970's for estimating seismic risk, with the aim of accounting for uncertainties in earthquake source, wave propagation path, and site conditions (Cornell, 1968, 1971). 33. | PowerPoint PPT presentation | free to view Early work focused mainly on modeling sources, occurrence and attenuation, and developing probabilistic hazard analysis methodologies, using Poisson models and Bayesian models. steps in a regional seismic hazard and risk analysis. 34. 2 shows the idealization of the representative 3D slice. ƒ 0.2- and 1.0-second spectral acceleration (SA) An overview of the inputs to Probabilistic Seismic Hazard Analysis (PSHA), and the mathematics used to combine them and produce a seismic hazard curve. ƒ 2% in 50 years probability of exceedance. 1. Instructional Material Complementing FEMA 451, Design Examples Seismic Load Analysis 9 - 17 1a, 1b) Stiffness (Soft Story) Irregularity Vertical Structural Irregularities Irregularity (1a) exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. Seismic Hazards:Seismic Hazards: dangers posed by large earthquakesdangers posed by large earthquakes • Ground Shaking - shake • Ground Rupture - cut • Liquefaction - very soft soil • Landslides - slope failure • Tsunami - waves Secondary Hazards: •Fire •Lateral spreading, etc. Fragility analysis, prior to seismic demand hazard analysis is applied on over 6000 analyses, revealing that intensity measures are poorly correlated both for 1-D and 2-D correlation, hardly leading to the selection of the optimal intensity measure. In seismic risk analysis the roles and work of seismologist and structural engineer are typically separated by the use of an interface variable, known as the intensity measure (IM). The analysis of structures is a fundamental part of seismic design and assessment. - A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 48aae9-OGEwN Derivation of IBC Design Maps The ground motions for design that are mapped in the IBC are based on, but not identical to, the USGS Probabilistic Seismic Hazard Analysis (PSHA) Maps for … 2% in 50 years probability of exceedance 0.2- and 1.0-second spectral acceleration (SA) The site-specific ground motion procedure in the building code explains the link between the two. PSHA estimates the likelihood that various levels of ground motion will be exceeded at a given location in a given future time period. This lecture is the first in a two-part series introducing the topic of seismic hazard analysis. Seismic Hazard Analysis. The urban analysis exercise aimed to teach students to look at cities and buildings in a new light, with a critical eye toward seismic phenomena and hazards. There are several online catalogs of earthquakes. Seismic hazard is function of mapped acceleration and soil 0.2-second spectral acceleration (Ss) 1-second spectral acceleration (S1) Site coefficients (Fa and Fv) Increasing rigor in the provisions with hazard Seismic Analysis and Design Procedures (SDAP) Seismic Detailing Requirements (SDR) The following two paragraphs are a paraphrase from Kramer (1996): If so, share your PPT presentation slides online with PowerShow.com. For example, the U.S. Geological Survey Hazim Dwairi The Hashemite University The Hashemite University 14.14. Engineering seismic risk analysis. - A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 45198b-NWYyY Recent publications reveal the case of locked-up stresses under the thick sediments of Bangladesh. Probabilistic Seismic Hazard Analysis Project Origins and Objectives 12-05-2012 * This slide shows the SSC model source zones and the historical seismicity. 76-67. Do you have PowerPoint slides to share? BSC Presentations_NWTRB_YMStepp_Wong_02/24/03.ppt 5 PSHA Methodology and Guidance • Level 4 PSHA, as defined by the Senior Seismic Hazard Analysis Committee (SSHAC): NUREG/ CR-6372 - Reviewed by the National Academy of Sciences - Accepted by the NRC for application in nuclear facility licensing • NRC Branch technical position on the use of expert elicitation Seismic hazard analysis has been an element of good engineering design practice in modern countries for many decades; it is an integral component of building codes and standards for design of critical structures such as dams, offshore structures and nuclear power plants. The seismic excitation/response was investigated only in the transverse landside . NUST CE - 842: Performance-based Seismic Design of Structures (Spring 2020) Overview; Lectures; Assignments; Tests/Exams; Resources; Nonlinear Modeling of Structures; Seismology and Seismic Hazard Analysis. moderate seismic hazard while some codes allow them to be used in areas with higher seismic hazard levels. (EPA) is used in the seismic hazard evaluation of dam site. This study is primarily based on a 3-D seismic dataset that covers 1,107 . SEISMIC HAZARD The seismic hazard can be . It began more than a hundred years ago, when static analysis with lateral loads of about 10% of the weight of the structure was adopted in seismic regulations. Performance-based Earthquake Engineering - A Very Short Introduction (why taking Dynamics of Structures) Dr. ZhiQiang Chen UMKC Spring,2011 Deterministic seismic hazard analysis (DSHA) and probabilist. In the longitudinal direction (Fig. Earthquake Hazards Reduction Program (NEHRP) is to encourage design and building practices that address the earthquake hazard and minimize the resulting risk of damage and injury. 1a), the wharf is composed of a large number of identical 3D slices, each of which is 6.1 m thick.Therefore, a representative 3D slice is selected for the seismic response analysis of the wharf-ground system. determined through hazard analyses (i.e., seismic hazard analysis in seismology and flood-frequency analysis in hydrology). Students use the 1995 hazards map to examine hazards at one or multiple locations (to save time, we recommend one location per group) A report out can include discussion of the value of each location (human population, infrastructure, dams, forested areas that might be owned by lumber companies, habitat (e.g. Probabilistic Seismic Hazard Analysis (PSHA) PSHA is the most used method to assess seismic hazard and risk for input into various aspects of public and financial policy. Classical Probabilistic Seismic Hazard Analysis Event-Based Probabilistic Seismic Hazard Analysis Scenario based Seismic Hazard Analysis. A short review of the seismic sources involved and the available earth-quake catalogue is given in chapter 2 along with a discussion of Icelandic attenuation characteristics. Probabilistic seismic hazard models consider earthquakes on faults and in background sources (random earthquakes). 20 Earthquake Hazards in India India has a long history of earthquake occurrences. Because many models and data sources are combined to create results like. 1 The project for Assessment of Earthquake Disaster Risk for the Kathmandu valley in Nepal (ERAKV) Seismic Hazard Assessment and Results By Mukunda Bhattarai Seismologist (NSC/DMG) & Fumio Kaneko JICA Project Team First Seminar, "Towards Resilient Kathmandu Valley" September 16, 2016. Deterministic seismic hazard analysis (DSHA) is an approach for evaluating site-specific seismic hazard that is influenced by the maximum hazard from the controlling sources affecting the specific study site. Individual seismic hazards Predictions of shaking intensity on San Andreas fault (long segment) in the Bay Area Shaking and liquefaction: the importance of surficial geology Building collapse as a result of soil liquefaction, Niigata, Japan, 1964 Liquefaction and the urban fire hazard: San Francisco, 1906 Ground motion, structural damage and . With respect to seismic risk analysis of dams, there are a num- CSI ETABS; CSI SAP . Seismic hazard analysis involves the quantitative estimation of ground shaking hazards at a particular area. Seismic hazard analysis can be done deterministically. decision according to seismic hazard and system performance (FEMA 273, 274, 356, 1997; FEMA 440, 2005). Fig. In this exercise, you will need to access one of these. ANALYSIS SEISMIC HAZARD • Defined as a natural phenomenon (such as ground shaking, fault rupture, or soil liquefaction) that is generated by an earthquake, although there are examples of these phenomena also being produced by human activities. NDSHA can play an important role in the prediction of ground motion for different models of seismic sources. For any given level of earthquake, REDARS uses state-of-knowledge models to estimate seismic hazards (ground motions, liquefaction, and surface fault rupture); the resulting damage (extent, type, and location) for each component in the highway system . Probabilistic Seismic Hazard Analysis (PSHA) aims to quantify these uncertainties, and combine them to produce an explicit description of the distribution of future shaking that may occur at a site. An overview ofthe different models for estimating the effects oflocal site conditions is presented. Introduction . Probabilistic Seismic Hazard Analysis 0.1 2 in 50 yrs Peak acceleration Crustal 0.01 lamax Intraplate 0.001 Interplate 0.0001 57 Probabilistic Seismic Hazard Analysis 0.1 2 in 50 yrs Sa(T 3 sec) 0.01 Crustal lamax Intraplate 0.001 Interplate 0.0001 58 Probabilistic Seismic Hazard Analysis Uniform hazard spectrum (UHS) Find spectral acceleration . In its conventional form, DSHA does not consider sources other than the largest "controlling" source and it does not account for the . United States Geological Survey open-file report, pp. Combine results 15.15. The use and misuse of logic trees in probabilistic seismic hazard . The current DPT 1302-52 [2] follows the former type where structures with intermediate ductility are only allowed in the moderate seismic areas defined by Seismic Design Category (SDC) C. ƒ The ground motions for design that are mapped in the IBC are based on, but not identical to, the USGS Probabilistic Seismic Hazard Analysis (PSHA) Maps for …. Probabilistic Seismic Hazard Analysis Project - Probabilistic Seismic Hazard Analysis Project Origins and Objectives 12-05-2012 * This shows the SSC model source zones and the historical seismicity. This seminar will cover all aspects related to design ground motions by going first through the probabilistic site specific seismic hazard analysis and the . Seismic Hazard Analysis, or PSHA. REDARS is a multidisciplinary tool for seismic risk analysis of highway systems nationwide. Most vulnerable areas - the Himalayan and sub-Himalayan regions, Kutch and the Andaman and Nicobar Islands. Deterministic Seismic Hazard Analysis CEE 431/ESS465 Deterministic Seismic Hazard Analysis Earliest approach taken to seismic hazard analysis Originated in nuclear . Earthquakes strike not only buildings but entire cities, disrupting transportation, power, water, and the entire urban infrastructure. In order to assess risk to a structure from earthquake shaking, we must first determine the annual probability (or rate) of exceeding some level of . 58, pp.1583-1606. Hazard Analysis Definitions: Definitions: Hazard - anticipated ground motion at siteanticipated ground motion at site Risk -- damage or losses to societydamage or losses to society Probabilisitic - considers uncertainty in input parameters (e.g., considers uncertainty in input parameters (e.g., magnitude, ground motion) Uncertainty -- aleatory (random), epistemic (variability in . This is the main purpose of a seismic hazard analysis, PSHA in particular. 3. • Strong ground motions produced by earthquakes that could affect engineered structures. 8 Bommer, J. and F. Scherbaum (2008). Models for estimating earthquake motion are briefly discussed in chap-ter 3 and the regression models applied in this study introduced. ƒ (Vs30=760m/s, i.e., boundary of Site Classes B/C) Derivation of IBC Design Maps. If so, share your PPT presentation slides online with PowerShow.com. The activity rates for earthquakes along faults are related to the slip rate (how fast one side of a fault slides past the other side). This procedure is recommended for all important and lifeline buildings. Deterministic Seismic Hazard Analysis, or DSHA). The tie-rod ductility, followed by its axial strength and wall size, is the mechanical parameter . Seismic hazard assessment for Bangladesh is a challenging task, due to the complex seismo-tectonic environment and limited information on seismic sources (faults). The committee chose the Seismic Hazard Assessment. In Figure a, Earthquake souces, we assume this is a M7 . Publication of this document, which is a companion guide to the 2009 edition of the NEHRP Recommended Seismic Provisions for Current practices in the seismic design of structures involves the determination of earthquake loads using seismic hazard analysis, which is commonly performed within the framework of probabilistic seismic hazard analysis (PSHA), and then these loads for structural design are used within the design framework dictated by building codes [1]. Introduction to the Hazard Module The hazard component of the OpenQuake-engine builds on top of the OpenQuake hazard library (oq-hazardlib), a Python-based library containing tools for PSHA calculations. Although computationally intensive, the maps are conceptually straightforward. View Abrahamson_eeri2009_v2.ppt from CE 7013 at Indian Institute of Technology, Chennai. Seismic regions: 1. Lecture Series on Seismology and Seismic Hazard Analysis; SE Software Tutorials. hazard analysis. 1. The purpose of this document is to discuss the calculations in-volved in PSHA, and the motivation for using this approach. Max Irvine developed site-specific seismic reports for the project, including a seismic hazard analysis.The potential for liquefaction was investigated; it was determined that liquefaction is not considered to have any structural implications for the deep-seated tower foundations. FORTRAN computer program for seismic risk analysis. A FORTRAN algorithm of Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF . Nevertheless, due to uncertainties in earthquake size, location, and time of occurrence; the approach is undertaken probabilistically. SEISMIC SLOPE STABILITY Tim McCrink Seismic Hazards Mapping Program California Geological Survey 100th Anniversary Earthquake Conference Commemorating the 1906 San Francisco Earthquake April 18 - 22, 2006 Performance-based Seismic Design. In the seismic source model, the faster a fault slips the more likely the fault is to generate . The results of such an analysis are expressed as estimated probabilities per year or estimated annual frequencies. The probabilistic map, . protected species like salmon in . Kashmir and Western Himalayas - Covers the Probabilistic seismic hazard analysis (PSHA) is a methodology that estimates the likelihood that various levels of earthquake-caused ground motions will be exceeded at a given location in a given future time period. Based on the analysis of 145 accelerograms recorded at rock site in the Western United State, the EPA is defined as the spectral State of Practice of Seismic Hazard Analysis: From the Good to the Bad Norm Abrahamson, Seismologist Pacific Gas & Electric Company Deterministic vs Probabilistic .

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