Earthquake design of equipment and supports by response. The 2018 update of the us national seismic hazard model. Seismic hazard curves and uniform hazard response spectra for the united states by a. Apr 17, 2019 this video is all about earthquake ground motion including velocity, accleration, displacement time history, ground motion spectra, fourier amplitude spectrum, power spectrum, response spectrum. Constant ductility response spectrum for elcentro earthquake california, may 18, 1940, ns component chopra 2012. Sitespecific mce r response spectra and design earthquake response spectra 23 mce r at 21 natural periods in the 0 to 10second band. Earthquake response spectrum free software download. Sep 14, 2015 new features incorporated dynamic response spectrum analysis, elastoplastic constant ductility response spectra, etc. To solve the equation of motions for different periods, the newmark linear method was used. The earthquake ground motion and response spectra design for. Prism is intended to be used by strongmotion seismic networks, as well as by earthquake engineers and seismologists.
Seismic ground motion response using shake, eera and nera for. Earthquake engineering research institute 499 14th street, suite 220 oakland, ca 94612 phone. Site response analysisgeotechnical earthquake engineering portal. It is open source, and is easy to install and run as standalone software on common operating systems such as linux, mac os x and windows. The map is based on the most recent usgs models for the conterminous u. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site. Construction of design response spectrum the chilean way. Originally, when we were studying the dynamics of a simple single degree of freedom structure, we noticed that given one type of earthquake, we dont have to keep solving the equat. This was then further developed into a design response spectrum for use in structural design, and this basic form. Bispec is a nonlinear spectral analysis software program that. If you are looking for software to compute the scale factor appropriate to obtain a match to a target response spectrum, good options include quakemanager and. The vast majority of engineering projects in the u. Earthquake engineering software the nisee software library cdrom, a collection of research software developed from the 1960s through the early 1990s, is sold out.
So, the hysteretic behavior of the soil is described using the shear. Earthquake software for signal processing of strongmotion data seismosignal constitutes an easy and efficient way for signal processing of strongmotion data, featuring a userfriendly visual interface and being capable of deriving a number of strongmotion parameters often required by engineer seismologists and earthquake engineers. The acceleration response spectrum of a ground motion is a relationship between the natural period of vibration of a sdof system and the maximum absolute acceleration that it experiences under the ground motion. Earthquake response spectra software free software download.
Earthquake ground motions for performing response history analysis. Spectra is a graphical presentation addon to microsoft excel. Studies of strong ground motion and damage from the 1994 northridge earthquake 1994. Geological survey editorial standards or with the north american stratigraphic code. This document presents the methodologies used to develop the deterministic, probabilistic and controlling design response spectra using the web tool ars online. The earthquake ground motion and response spectra design. Online version of the work on response spectra analysis in managua city. Response of an empty cylindrical ground supported liquid storage tanks to base excitation. The soil behavior is modeled assuming that both the shear modulus and the damping ratio vary with the shear strain amplitude. A software and database for earthquake engineering applications not available earthquake risk to sites. Much of the information provided herein is based on the standards of the caltrans seismic design criteria appendix b sdcb.
Such spectra are called in structure response spectra or floor response spectra. Sitespecific design parameters s ms, s m1, s ds, s d1 mceg parameter pga m plots, a csv file, and pdf reports. Software applications for analysis of structures subjected to seismic actions. The accelerograph records three orthogonal components of ground acceleration. The main reasons for the widespread use of this method are. Seismic hazard analysis calculating the probability of earthquake ground shaking at the surface or in the bedrock beneath a site based on the location of surrounding faults spectral matching adjusting an accelerogram to match a target.
The primary objective of this task was to develop guidance for selecting, generating, and scaling earthquake ground motions for effective use in performing response history analyses for. Design ground motions ground motion parameter values for the design of buildings, bridges, and other structures. Software for generation of spectrum compatible time history. Prism is a free program for seismic response analysis of structures idealized. Introduction the most direct description of an earthquake motion in time domain is provided by accelerograms that are recorded by instruments called strong motion accelerographs. Floor response spectra generation for seismic design of. Earthquake acceleration time history and response spectra design are needed as basis to determine the earthquake loading that can be used to design and assess the tall building and other structures.
A new computerbased platform has been proposed whose novelty consists in modeling the local site effects of the ground motion propagation using a hybrid approach based on an equivalent linear model. The response spectrum is determined with sap 2000 software and designed in accordance with is 1893. Ezfrisk is a software package used by engineers and seismologists to perform sitespecific earthquake hazard analysis. Strong motion data processing usc earthquake engineering. Open source software for strong ground motion data processing. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes. It can also compute several types of nonlinear spectra including constantstrength, constantductility and constantdamage spectra. Workshops workshops are conducted periodically for input into the hazards products. Earthquake ground motion analysis ground motion spectra and. If the equipment is located at a higher floor of a building, then the response spectra for the earthquake motion at that floor are used in the analysis. Quakemanager is a stateoftheart earthquake ground motion software with an unprecedented set of features and capabilities. It is part of the process of structural design, earthquake engineering or structural assessment and retrofit see structural engineering in regions where earthquakes are prevalent as seen in the figure, a building has the potential to wave back. The response spectrum of an earthquake is the most favored seismic input for earthquake engineers. The program has a large variety or response spectrum plotting tools, including the tripartite spectrum shown here.
A computerbased environment for processing and selection. Matching spectrum in figure 14 is acquired based on multiplying between response spectra figure and scaling factor a 2. Seismosoft earthquake engineering software solutions. Earthquake software for response spectrum matching seismomatch is an application capable of adjusting earthquake accelerograms to match a specific target response spectrum, using the wavelets algorithm proposed by abrahamson 1992 and hancock et al.
Sep 12, 2017 response spectra are very useful tools of earthquake engineering for analyzing the performance of structures and equipment in earthquakes, since many behave principally as simple oscillators also. Scec committee for utilization of ground motions simulations. Campbell, kw, bozorgnia, y 2014 ngawest2 ground motion model for the average horizontal components of pga, pgv, and 5% damped linear acceleration response spectra. In the 1982 eeri monograph on earthquake design and spectra, newmark and hall describe how they developed an idealized seismic response spectrum based on a range of response spectra generated for available earthquake records. Earthquake response spectrum analysis of 4 story shear. Ground motion spectra, average spectra, and code spectra can be plotted simultaneously. Trifunac 2006 only for fair use a study of vertical and horizontal earthquake spectra only for fair use seismic design spectra for nuclear power plants n. Source code on the cdrom and most of the manuals are now available through the earthquake engineering online archive. Extended threedimensional analysis of building systems. These peak responses are then combined to estimate a total response. Visual comparison of actual, target, and matching spectrum. Earthquake solutions providing stateoftheart software. Ezfrisk software for earthquake ground motion estimation. The first step in a modal response spectrum analysis is the determination of the 3d modal shapes and natural frequencies of vibration eigenmodes and eigenvalues.
For earthquake loads, you define one or more response spectra and apply them in a specified direction over part or all the piping system. Earthquake response spectrum analysis caesar ii help. Among the most important seismic parameters of a strong ground motion are the various types of spectra i. Dear satish bhagat, here is target response spectrum and time history response spectrum not matched and matched both are plotted. Strongmotion processing steps in the automated workflow are clearly defined, and use a set of customizable parametersspecified in a configuration fileto generate cosmos v1 acceleration with mean removed, v2 baselinecorrected and filtered acceleration, velocity and displacement, and v3 response spectra, fourier spectra and intensity. The local seismic response has been modeled using an equivalent linear. Elastic response spectrum for elcentro earthquake california, may 18, 1940, ns component. Spectrum time history definitions tab spectrum time history load cases tab staticdynamic combinations tab lumped masses tab snubbers tab control parameters tab advanced tab. Openseismomatlab file exchange matlab central mathworks. We have developed empirical equations for predicting earthquake response spectra in terms of magnitude, distance, and site conditions, using a twostage regression method similar to the one we used previously for peak horizontal acceleration and velocity. Response spectra can also be used in assessing the response of linear systems with multiple modes of oscillation multidegree of freedom systems, although they are only accurate for low levels of damping. Elastic response spectrum file exchange matlab central. Select an earthquake component in the earthquake field.
Prism for earthquake engineering home software prism. Instructional material complementing fema p 751, design examples nonlin and eqtools 1. Response spectra are very useful tools of earthquake engineering for analyzing the performance of structures and equipment in earthquakes, since many behave principally as simple oscillators also. When data other than the buildin earthquake history records are to be generated, click to open the data in. Modal analysis is performed to identify the modes, and the response in that mode can be picked from the response spectrum. With the tools provided by this introductory study, the earthquake response problems of structure, and of equipment mounted therein, are examined both by time history and frequency domain analysis methods. The seismic analysis of systems and components in nuclear power plants is typically performed by dynamic analysis, in particular modal response spectra analysis. For the purpose of earthquake resistant analysis and design of structures. The acceleration response spectrum of a ground motion is a relationship between the natural period of vibration of a sdof system and the maximum absolute acceleration that it. Established in 1984, the journal is owned by the earthquake engineering research institute eeri and is dedicated to providing the publication of record for the development of earthquake engineering practice, earthquake codes and regulations, earthquake public policy, and earthquake.
Today, this task can be performed very reliably and efficiently by many computer programs dedicated to seismic response analysis for the purposes of earthquake resistant design. The results of the psha indicated an increase in the surface spectra in the low frequency range 0. Graizerkalkan 2015 ground motion prediction equation gmpe is designed to predict peakground acceleration and 5% damped pseudospectral acceleration response ordinates for shallowcrustal continental earthquakes to be used in earthquakeengineering applications including probabilistic and deterministic seismic hazard analyses. Sep 16, 2011 the response spectrum of an earthquake is the most favored seismic input for earthquake engineers.
Such spectra are usually provided by the architectengineer or seismic structural analyst of the building. Modal response spectrum analysis earthquake resistance. Most of existing public signal processing software are developed to. Furthermore, the mean and median acceleration response spectra of the. This is unlike all other industries where seismic analysis is based on static methods defined in standards such as american society of civil engineers asce7. The acceleration response spectra is represented as piecewise linear segments, whose endpoints are defined by a time, acceleration coordinate. Usgs uses github for all new software development, as well as open. Selecting and scaling earthquake ground motions for.
Why response spectral matching should be done with target. For more details, please refer to the user guide found on the data access website. The earthquake engineering online archive nisee elibrary simqkei software and manuals text6173 vanmarcke, erik h gasparini, dario a simulated earthquake motions compatible with prescribed response spectra. Seismomatch is an application capable of adjusting earthquake accelerograms to.
Sep 28, 2015 a new computerbased platform has been proposed whose novelty consists in modeling the local site effects of the ground motion propagation using a hybrid approach based on an equivalent linear model. Methodology for developing design response spectrum for use. In this paper a fifteen storied commercial building is subjected to an earthquake load histogram as in the case of bhuj earthquake in gujarat. Examples were added which verify theoretical data, earthquake case studies and problems solved in textbooks. Nonlin and eqtools software for earthquake engineering education. A displacement response spectrum is the plot of maximum displacement of a single degree of freedom system sdof to a particular ground motion as a function of the natural frequency and damping ratio of the sdof. Software to download usgs earthquake hazard program. Ce 573 structural dynamics homepage purdue university.
The earthquake engineering online archive nisee elibrary. I am aware of the theory behind this but would like to locate software that can do it for me without setting out to write something myself. Earthquake software for response spectrum matching. Response spectrum analysis is the dominant contemporary method for dynamic analysis of building structures under seismic loading. Opensignal is a free closedsource software platform for the processing and selection of seismic records, signal processing, response spectra analysis, soil spectra analysis and more 16, 17. It provides filtering uncorrected ground motion records and calculation of the main parameters of a record arias intensity, duration, pga, pgv, elastic.
Established in 1984, the journal is owned by the earthquake engineering research institute eeri and is dedicated to providing the publication of record for the development of earthquake. Hi, i want to convert a time history record of an earthquake into a response spectrum. Nonlin and eqtools software for earthquake engineering. Is there any software for scaling earthquake records. Sep 26, 2018 opensignal is a free closedsource software platform for the processing and selection of seismic records, signal processing, response spectra analysis, soil spectra analysis and more 16, 17. The problem of the design of hypothetical earthquakes to be compatible with given target spectra is examined first. Bispec is a nonlinear spectral analysis software program that performs unidirectional and bidirectional dynamic timehistory analysis of a simple dynamic system under earthquake ground motion records. This spectrum were done taking as a start point normalized version of the response spectra obtained from different accelerograms recorded for the following earthquakes. A displacement response spectrum is the plot of maximum displacement of a single degree of freedom system sdof to a particular ground motion as a function of the natural frequency and damping ratio of. Earthquake solutions provides stateoftheart software solutions for structural and earthquake engineering.
The first data reported from an earthquake record is generally the peak ground acceleration pga which expresses the tip of the maximum spike of the acceleration ground motion figure 1. This web tool calculates risktargeted ground motion values from probabilistic seismic hazard curves in accordance with the sitespecific ground motion procedures defined in method 2 section 21. The typical earthquake ground motion response spectrum represents an envelope of the peak responses of many singledegreeoffreedom sdof systems with different periods. Floor response spectra generation for seismic design of buildings. The acceleration time history and response spectra design for certain site can be acquired using the seismic hazard analysis, amplification of ground motion quantity, and spectral matching in time domain. It generates triaxial graphics to present earthquake response spectra.
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