Seismic evaluation of buildings with pushover analysis i. Fema 350 recommended seismic design criteria for new. Eeri technical seminar series impact of soilstructure interaction on response of structures seminar 1. Fema 356 seismic rehabilitation prestandard ix preface the title of this document, fema 356 prestandard and commentary for the seismic rehabilitation of buildings, incorporates a word that not all users may be familiar with. Three design methods based on the fema 356 guideline and the ubc 97 code are taken in to consideration. Federal emergency management agency fema 273 october 1997 nehrp guidelines for the seismic rehabilitation of buildings issued by fema in furtherance of the decade for natural disaster reduction. Investigation the accuracy of fema440 procedure to. Emergency management institute independent study is. For the case of embedded foundation, both ki and ii effects are included in the fema440 7 procedure. The c2 coefficient of fema 356 implies that inelastic displacement should increase for stiffness degrading. This document provides recommended criteria for the design of steel momentframe buildings to resist the effects of earthquakes. Technical report research project t4120, task 7 nonlinear dynamic and static analysis of i5 ravenna seismic assessment of wsdot bridges with prestressed. The applied technology council 555 twin dolphin drive, suite 550 redwood city, california 94065.
While such documents provide the hinge properties for several ranges of detailing, programs may implement averaged values. The following items were reformatted and updated for the web by randolph langenbach while an employee of fema headquarters, but they were never published by fema on the web following administration and personnel changes. For example, certain damages or losses of facilities and equipment may fall into the permanent work categories. Performance based seismic design of reinforced concrete. Pro v8i will eliminate the countless manhours required to properly load your structure by automating the forces caused by wind, earthquakes, snow, or vehicles. Those efforts produced updated documents in prestandard form fema 178, 1992. A policy guide to steel moment frame construction fema.
The building seismic safety council bssc was established in 1979 under the auspices of the national institute of. Modelling of unreinforced masonry infill walls considering. Notwithstanding the instructional examples and explanations found in the. Chopra, university of california, berkeley this paper comprehensively evaluates the modal pushover analysis mpa procedure against the exact nonlinear response history analysis. Load and resistance factor design manual for engineered wood construction. Fema 273 nehrp guidelines for the seismic rehabilitation of. The flow charts and table that follow are provided to assist the user of the nehrp recommended provisions and, by extension, the seismic provisions of asce 7, minimum design loads for buildings and other structures, the international building code, and nfpa 5000. Effects of plastic hinge properties in nonlinear analysis. Seismic assessment of wsdot bridges with prestressed. The discourse follows the philosophy of performance based seismic engineering procedure better known as fema 356 nonlinear pushover analysis and using the universally acclaimed finite element method software etabs 2015. Disclaimer this document provides information on the seismic performance of steel momentframe structures and the results and recommendations of an intensive research and development program that culminated in a series.
The title of this document, fema 356 prestandard and. Nehrp guidelines and commentary for the seismic rehabilitation of buildings 1997 fema published a revised guideline, designated fema 310 january 1998 entitled. Fema 356 provide a reasonably accurate representation of the displacement experienced in an. Pushover analysis is performed to produce the ultimate building capacity. Superseded by fema356 for design and construction purposes. The requirements of this chapter shall apply to existing concrete components of a building system, rehabilitated concrete components of a. Default hinge properties are derived from which source. A simple example of a pushover analysis is illustrated in figure 1. Generic building example of decreasing base shear with.
Example building foundation modeling inertial effects kinematic effects response spectrum for analysis bearing capacity. This is because, as will be seen later, using only one diagonal member is sufficient to satisfy the ipoop interaction relationship. Performance based seismic design performance based seismic design is a process of designing new buildings or seismic upgradation of existing buildings, which includes a specific intent to achieve defined performance objectives in future earthquakes. Plans guide operations, but they also provide shared. Fema 547 techniques for the seismic rehabilitation of. Example applications of the nehrp guidelines for the seismic. This is a fairly comprehensive set of examples for applying the seismic provisions in fema 450 that is the update to fema 356. Getting started with the mitigation planning process, including important considerations for how you can organize your efforts to develop an effective mitigation plan fema 3861. Pushover analysis, fema 356, eurocode 8, seismic assessment, plastic rotation. Picture of emi campus with emergency management institute sign in foreground and buildings n and o in the background titlethe campus of femas national emergency training center, located in emmitsburg, md. Pdf seismic assessment of rc buildings according to fema 356.
Seismic assessment of a rc building according to fema 356. The pushover analysis, explained in its simplicity rahul leslie1, assistant director, buildings design, driq board. Fema 356 seismic rehabilitation prestandard 101 10. Definition of userdefined hinge properties requires moment rotation characteristics. Seismic assessment of wsdot bridges with prestressed hollow core piles part ii. Federal emergency management agency fema and many other departments and agencies develop operational plans to express what they intend to accomplish to address threats, hazards, and incidents that have already happened.
Fema seal before fema was merged into the department of homeland security. Fema 356,11 on its way to becoming an asce standard. The presented example is a threebay threestorey steel braced frame. Fema 310 handbook for the seismic evaluation of buildings. Estimation of displacement demand in rc frames and comparing with target displacement provided by fema356. Following the publication of both atc 14 and fema 273, the federal emergency management agency fema began to support efforts to transition those documents from guidelines into national standards.
That wordprestandardhas a special meaning within the asce standards program in that it. So, caution should be taken when these nsps are used for practical systems, for example, lowrise buildings in most spectral period ranges. For example, a flexural hinge represents the momentrotation relation. These recommendations were developed by practicing engineers, based on professional judgment and experience, and by a program of laboratory, field and analytical research. Seismic assessment of a rc building according to fema 356 and eurocode 8 ioannis p. Software for structural analysis and design analysis reference manual. Pdf estimation of displacement demand in rc frames and. Fema ihp program sba page 32 gao07356 coastal barrier. Prestandard and commentary for the seismic rehabilitation of buildings 2000.
Fema 356 2, in that it uses only one diagonal member rather than the two compressiononly diagonal struts used in 2. Seismic assessment of a rc building according to fema 356 and. Overwrite options are available for the manual definition of. Goel, california polytechnic state university, san luis obispo and anil k. Federal emergency management agency fema 354november 2000 a policy guide to steel moment frame construction. Deals with testing to determine the individual bed joint shear strength of the mortar.
Automatic hinge properties for steel members are based on table 56 of fema356, and for concrete members, tables 67 and 68. Verification of code procedures for nonlinear analysis of wood. Pushover analysis is carried out for either userdefined nonlinear hinge properties or defaulthinge properties, available in some programs based on the fema356 and atc40 guidelines. Curriculum vitae tips and samples the graduate college. Fema310 handbook for the seismic evaluation of buildings, 1998 introduction the american society of civil engineers asce contracted with the federal emergency management agency fema to convert fema 178, nehrp handbook for the seismic evaluation of existing buildings into a prestandard. Expenses for personnel only the actual hours worked beyond the regular duty time either overtime, regular time hours, comp time can be claimed for fema category a and b emergency work. A solution to the requirements outlined in fema 356. Fema 308, the repair of earthquake damaged concrete and masonry wall buildings, discusses the policy issues pertaining to the repair of earthquake damaged buildings and illustrates how the procedures developed for the project can be. Getting started the howto guides cover the following topics. Procedures manual, fema 306, federal emergency management agency, washington, d. In order to have a crackfree sample with almost no. What is the effective v s for a nonuniform profile.
Influence of the soilstructure interaction on the design. Pushover analysis, fema 356, eurocode 8, seismic assessment. Substantial additional support, in the form of donated materials, services, and data has been provided by. Momentframe structures was principally provided by the federal emergency management agency, with ten percent of the phase i program funded by the state of california, office of emergency services. Pdf seismic assessment of rc building according to atc 40. Similarly, the simplified rehabilitation method contained in fema 356. Summary and application example fema 440 improvement of nonlinear static seismic analysis procedures 103 incycle degradation produces effects similar to p. Fema356, federal emergency management agency, 2000. Fema 273 nehrp guidelines for the seismic rehabilitation. A sitespecific and structure specific displacement amplification factors may be calculated performing time response history analyses for an elastic single degree.
Teaching assistant, introduction to structural engineering. Point d represents the residual strength of the plastic hinge. Supporting documentation complements the users manual fema227, volume 1. Application of the method is illustrated by means of an example. Displacement amplification factors based on fema 356, fema 440, or alternate methods are intended to be code friendly and are based on typical design spectra. Seismic evaluation and retrofit of existing buildings. Pdf seismic assessment of rc building according to atc. The seismic design provisions of the uniform building code, since its 1962 edition, have been based on.
Point c represents ultimate capacity of plastic hinge. Substantial additional support, in the form of donated materials, services, and data has been provided by a. Fema 356 structural engineering general discussion eng. Seismic performance evaluation of existing rc buildings designed. Performance levels of the buildings are specified according atc40, fema356, and. Guide to use of the provisions university of alabama.
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