Generally, the structural retrofit of concentrically braced frames improved the seismic resistance of the building and it can be considered in the retrofit of moment. Due to the variety of structural condition of building, it is hard to develop typical rules for retrofitting. Seismic retrofit services srs retrofit san fernando valley. Modeling of prototype buildings summarizes the methodology and presents the conclusions of the modeling phase carried out by tecminho, university of minho, portugal, as part of the seismic retrofitting project srp between 2015 and 2017, techminho studied four prototypes of historic earthen architecture in peru in their current conditions and in retrofitted configurations. Ribakov ariel university center of samaria, ariel, israel abstract historical buildings are usually characterised by relatively low height and their natural vibration period is rather low. Feb 09, 2017 seismic retrofitting guidelines of buildings in nepal. Seismic retrofitting techniques for concrete structures focuses procedures to improve evaluation of seismic vulnerability of reinforced concrete buildings and provide innovative retrofitting techniques such as base isolation and mass reduction.
Modeling of prototype buildings summarizes the methodology and presents the conclusions of the modeling phase carried out by tecminho, university of minho, portugal, as part of the seismic retrofitting project srp. Therefore, seismic retrofitting of building structures is one of the most important aspects for mitigating seismic hazards especially in earthquakeprone countries. This paper presents a comprehensive overview of the techniques available for the seismic retrofitting of adobe buildings. To ensure the safety and security of a building, employees, structure functionality, machinery and inventory essential to reduce. Seismic evaluation and retrofitting of buildings and structures. For each retrofit stage, several details and construction photos are presented. Pdf seismic retrofitting techniques for concrete structures. The seismic evaluation process consists of investigating if the structure meets the defined.
Seismic retrofitting techniques for concrete structures. The retrofit techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms. Conclusion seismic retrofitting techniques for concrete structures. Seismic evaluation and retrofit of unreinforced masonry building with flexible diaphragms seismic evaluation of a. Seismic assessment and retrofitting of buildings the only part in the whole set of 58 eneurocodes that deals with existing structures 1st standard in europe on seismic assessment and retrofitting of buildings no experience in european practice w codified seismic assessment and retrofitting. Seismic retrofitting guidelines of buildings in nepal. June, 2014 when citing these guidelines the following citation should be used. Download pdf the principles of seismic retrofit refer to the goals, objectives and steps. Seismic risk factors courtesy of utah division of state. Need of retrofitting in existingearthquake vulnerable buildings buildings have been designed according to a seismic code, but the code has been upgraded in later years. Building materials used in seismic retrofitting should be located on the interior andor blended with existing architectural features. Using seismic isolation systems for retrofitting historic buildings i. Innovative materials for seismic and energy retrofitting of the. The problems faced by a structural engineer in retrofitting earthquake damaged building.
Handbook on seismic retrofit of buildings download ebook. Alameda is renowned for its historic woodframed architecture, and there are many buildings in the city that are classified as softstory where open store fronts or garages are tucked under the building. A retrofit for this type of building generally includes adding roof to wall anchors and continuity ties throughout the building. In parts of the state vulnerable to seismic events, the resilient building. This may achieve the retrofit objectives for buildings with lightly insufficient seismic resistance. Nov 11, 2011 seismic retrofitting definition it is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Seismic evaluation and retrofit of existing buildings describes deficiencybased and systematic procedures that use performancebased principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. To mitigate the seismic hazard, existing building should be rehabilitated.
For buildings with large seismic deficiencies, a combination of conventional and frp strengthening techniques may prove to be an effective retrofitting solution. This thesis also intends to give out the fundamental notions in part 1 of eurocode 8, which are useful for the assessment and retrofit of buildings. Buildings free fulltext nonlinear modelling of curved. Seismic design, assessment and retrofitting of concrete buildings. After briefly introducing how seismic action is described for design purposes, methods for assessing the seismic vulnerability of existing buildings are presented. Seismic evaluation and retrofit of existing buildings, standard ascesei 4117, describes deficiencybased and systematic procedures that use performancebased principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. Seismic evaluation and strengthening of existing buildings. As known, the main advantage of using seismic isolation systems for protection of historic buildings is that the retrofitting works can be performed at the basement or roof levels.
Tesfamariam s, goda k eds handbook of seismic risk analysis. Index seismic retrofitting manual for highway structures. Ppt on retrofitting concrete beam structure free 30. The seismic retrofit of historic buildings is as much an art as it is a science. Part 1 of this manual focuses on highway bridges, and is a replacement for the federal highway administration fhwa publication seismic retrofitting manual for highway bridges which was published in 1995 as report fhward94052. The focus of this manual is on retrofitting buildings that are subject to flooding. Part 2 of this manual provides guidance on the assessment and retrofitting of other typical highway structures.
Reflecting the historic first european seismic code, this professional book focuses on seismic design, assessment and retrofitting of concrete buildings, with thorough reference to, and application of, eneurocode 8. Seismic rehabilitation of buildings fema 356 provides guidance for evaluating the seismic performance of existing structures and determining the necessary retrofitting methods to achieve the performance objectives asce 2000. Sponsored by the structural engineering institute of asce. Mandatory soft story program department of building. Seismic retrofitting of existing structures pdxscholar portland. National disaster management guidelines seismic retrofitting of deficient buildings and structures a publication of. For the collection of examples, buildings were selected to be as different and extensive as possible according to building use, structure type, ground type, seismic. Techniques of seismic retrofitting for concrete structures. It analyzes these techniques viability from a structural engineering standpoint, and evaluates their suitability in the context. Seismic retrofitting of constructions vulnerable to earthquakes is a current problem of great political and social relevance.
The seismic retrofitting of a building is usually the result of a process that, through analysis and evaluation of the current state of its. However, for detailed technical guidance on seismic retrofitting, reference should be made to fema 547 fema, 2006 which applies to all types of buildings and for all types of use and occupancy. The following guidelines are prescriptive minimum standards based on the 2006. When masonry debris falls, it is potentially lethal. The seismic and energy retrofitting of existing european buildings with. Commercial seismic retrofitting california foundation works. Click download or read online button to get handbook on seismic retrofit of buildings book now. The seismic and energy retrofitting of existing european buildings with innovative materials is addressed in this report. Three specific structures such as historical buildings, bridges, and liquid storage tanks are selected to investigate the effectiveness of the base isolation in seismic retrofitting. The retrofitting of existing buildings for seismic. Planning and engineering guidelines for the seismic.
National disaster management authority government of india ndma bhawan a1, safdarjung enclave new delhi 110029 isbn no. Seismic retrofitting techniques linkedin slideshare. Global retrofitting local retrofitting the retrofitting in which we use to repair only the structural elements is called local retrofitting. This is the third in a series of gsap volumes that began in 1996 with the publi. Earthquake prone buildings wellington city council guide. A seismic retrofit for this type of building typically involves adding rooftowall connections, continuity ties, and installing a new plywood overlay on the roof. This seismic retrofit guide is designed to promote public safety and welfare by reducing the risk of earthquake induced damage to existing homes. Innovative materials for seismic and energy retrofitting of. Buildings designed to meet the modern seismic codes, but deficiencies exist in the design andor construction.
Seismic retrofit contractor oaklandberkeleysan jose. It is evident that the building can withstand the seismic action if and only if r. Damage to unreinforced masonry buildings is dangerous. The main benefit of retrofitting with composites is the increase in deformation capacity of the building, and in its load capacity to an extent. Introduction to retrofitting retrofitting is any change made to an existing structure to reduce or eliminate the possibility of damage to that structure from flooding, erosion, high winds, earthquakes, or other hazards. This thesis describes the process for retrofitting a building for seismic criteria. The retrofitting is examined with an application to a 64m highrise src steel framed reinforced concrete building built in 1970. It also provides certain aspects of computer software modeling against seismic loads and shows the necessity of seismic upgrading in a steel momentframe building. Pdf base isolation for seismic retrofitting of structures. The retrofitting of existing buildings for seismic criteria.
Seismic retrofit consists of adding roof to wall anchors and continuity ties in its simplest form. Some methods are additions of rc structural walls, use of steel bracings, seismic isolation, use of frp and supplemental energy dissipation devices dampers. Seismic retrofitting techniques for historic adobe buildings. Strategies and collection of examples in switzerland foen 2008 10 1 dealing with existing structures in recent years the seismic requirements in building standards have been getting distinctly more rigorous. Earthquake load is generated from the site seismicity, mass of the structures, important of buildings, degree of seismic resistant, etc. Seismic isolation technology is very effective to retrofit existing buildings while they are in service. The risk of a major earthquake is always present in alameda, just as it is in much of california.
Or concepts including strengthening, repairing and increasing the seismic types of retrofitting there are two types of retrofitting used for repairing the structures. It has matured in the recent years to a highly reliable technology. Pdf the seismic retrofitting of reinforced concrete buildings not designed to withstand seismic action is considered. The need of seismic retrofitting of building arises under to circumstances. Seismic assessment and retrofitting of existing buildings, according to the eurocode 8 part 3. If instead, r building is vulnerable to the design earthquake.
Seismic retrofitting is a suitable technology for protection of a variety of structures. Advanced design examples of seismic retrofit of structures. Because there are many earthquakes in japan, buildings must not only be able to be simply repaired, but also be strengthened. This is revealed during strong earthquakes that result in collapses. Techniques of seismic retrofitting for concrete structures core. Assessment of prototype buildings etty conservation institute contents volume 1 project participants v chapter 1 background 1. The need for retrofitting of old buildings emanates from their substandard design in terms of both earthquake resistance and thermal insulation. Seismic design, assessment and retrofitting of concrete.
Example 2 is a chapel in a university built in 1920. Bay area retrofit does not recommend performing a retrofit without the guidance and supervision of experienced and knowledgeable retrofit professionals, and is not responsible for costly errors, injuries, or earthquake. Compilation of adobe, masonry and rcc feb 9, 2017 given that nepal lies in a seismicallyvulnerable area, prone to the kind of natural disaster that occurred in 2015, it is imperative that buildings are designed with seismic resilience in mind. Guidelines for seismic evaluation of existing buildings. Pdf seismic retrofitting of reinforced concrete buildings using. Though not applicable to all building types, the document also discusses some costeffective strengthening schemes for existing older buildings identified as seismically deficient during the evaluation process.
Using seismic isolation systems for retrofitting historic. Between 2015 and 2017, techminho studied four prototypes of historic earthen. The primary purpose of this document is to provide a selected compilation of seismic rehabilitation techniques that are practical and effective. After many kinds of survey, we proposed three ideas of seismic retrofitting and selected base isolation. Asce 4117 seismic evaluation and retrofit of existing buildings 2017 updated from asce 41 significant changes were included for the basic. There are many seismic retrofitting techniques available, depending upon the various types and conditions of structures. Using seismic isolation bearings and the like to reduce the seismic energy applied to the structure in order to improve its various performance values during an earthquake. The goal with each method is to strengthen junctions of the structure, which provides increased strength and resilience. The standard presents a threetiered process for seismic evaluation according to a range. Commentary for seismic rehabilitation of buildings atc 1995 were developed by the federal emergency management agency fema to provide performancebased recommendations for retrofitting existing buildings. It analyzes these techniques viability from a structural engineering. The goal of the mandatory retrofit programs, under the ordinance, is to reduce these structural deficiencies and improve the performance of these buildings during earthquakes. Buildings built prior to 1985 need to be looked at for possible strengthening and buildings prior to 1975. Seismic retrofit with the addition of new shear walls to an existing frame design of new rc shear walls on the perimeter of a seismically deficient fivestorey building of example 1 is illustrated as a retrofit option.
Many strengthening techniques have been introduced aimed at improving the structural performance of existing structures that, if properly designed and applied, provide an effective contribution. Pdf evaluation of seismic retrofitting techniques used in old. The getty seismic adobe project gsap was first discussed in october of 1990 at the sixth international conference on earthen architecture in las cruces, new mexico. But, the expertise needed is not available in the basic level. The main aim in retrofit design of the building is to minimize the seismic demands on the rc shear walls by optimizing their arrangements in the plan of the building.
This strengthens the connections that have found to be inadequate in older buildings. Many existing buildings may be inadequate and pose severe risk during seismic events. Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Each building has different approaches depending on the structural deficiencies. This nextgeneration standard combines the evaluation and retrofit process and puts forth a three. This site is like a library, use search box in the widget to get ebook that you want.
An approach to retrofitting in which complete analysis of the response of the building to seismic hazards is performed, implicitly or explicitly recognizing nonlinear response. Seismic evaluation and retrofit of existing buildings 4117. Seismic retrofitting of structures bundesamt fur umwelt. Both of these projects developed similar standardized performance level definitions, which are shown in figure 2. The mandatory soft story retrofit program mssp was created in 20 as a multiyear communitybased effort led by the earthquake safety implementation program and enforced by the department of building inspection to ensure the safety and resilience of san franciscos housing stock through the retrofit of older, woodframed, multifamily buildings with a softstory condition. Varios terms are associated to retrofotting with a marginal differnce like repair, strengethening, retrofitting, rehabilitation, reconstruction etc. Seismic retrofitting of reinforced concrete buildings using. Seismic evaluation and retrofit of existing buildings. Essential buildings must be strengthened like hospitals. With better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged. A retrofitting to these types of concrete buildings involves the installation of combined modes such as concrete shear walls, caissons, steel columns and other types of strengthening systems. In japan, more than 17 existing buildings has been executed or under planning of retrofit. Foundation retrofitting underground wall beam addition method.
Seismic retrofitting consists of one or more structural interventions developed to improve the resistance of existing buildings to seismic loads. Reflecting the historic first european seismic code, this professional book focuses on seismic design, assessment and retrofitting of concrete buildings, with thorough reference to. The seismic retrofitting of reinforced concrete buildings not designed to withstand seismic action is considered. A reliable numerical evaluation of the nonlinear behaviour of historical masonry structures, before and after a seismic retrofitting, is a fundamental issue in the design of the structural retrofitting.