After briefly introducing how seismic action is described for design purposes, methods for assessing the seismic vulnerability of existing buildings are. Seismic design, assessment and retrofitting of concrete. The sample twostorey structural system exhibits high vulnerability, i. After many kinds of survey, we proposed three ideas of seismic retrofitting and selected base isolation. Click download or read online button to get handbook on seismic retrofit of buildings book now. The authors present various international case studies of seismic retrofitting projects and the different possible strategies on how to handle complex problems encountered. The retrofitting of existing buildings for seismic. Similar to masonry buildings various methodologies are available for analysis and retrofitting of rc frame building structures. Seismic retrofitting of reinforced concrete buildings using. Key words a nonlinear static pushov er analysis, shear walls, bracing system, rc building, seismic retrofitting 1. 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.
Due to the variety of structural condition of building, it is hard to develop typical rules for retrofitting. Each building has different approaches depending on the structural. Jan 18, 2016 seismic retrofitting of buildings today, many countries are the victims of severe earthquakes resulting in the loss of lives of human being, animals, destruction of buildings, and many more. Seismic evaluation and retrofitting of buildings and structures. Building owners in midamerica need adequate methods to make informed decisions regarding whether or not seismic retrofitting is advantageous andor. Seismic evaluation and retrofit of concrete buildings. Seismic retrofit for reinforced concrete building structures. Both of these projects developed similar standardized performance level definitions, which are shown in figure 2. Between 2015 and 2017, techminho studied four prototypes of historic earthen. This new legislation transferred sb 519 alquist the alfred e.
Seismic retrofitting of buildings today, many countries are the victims of severe earthquakes resulting in the loss of lives of human being, animals, destruction of buildings, and many more. As known, the main advantage of using seismic isolation systems for protection of historic buildings is that the retrofitting works can be. Seismic evaluation consists of gathering asbuilt information and obtaining the results of a structural analysis based on collected data. Handbook on seismic retrofit of buildings download ebook.
Seismic retrofitting of constructions vulnerable to. Parametric analysis of feasibility of seismic retrofit. The retrofitting is examined with an application to a 64m highrise src steel framed reinforced concrete building built in 1970. This thesis describes the process for retrofitting a building for seismic criteria. Assessment of prototype buildings etty conservation institute contents volume 1 project participants v chapter 1 background 1. The focus of this manual is on retrofitting buildings that are subject to flooding. In parts of the state vulnerable to seismic events, the resilient building. 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. Repairs can lead to increased stiffness, strength, and failure deformation. Pushover analysis and seismic retrofitting using shear.
Decision analysis for seismic retrofit of structures. Seismic assessment and retrofit the eurocode 8 part3, assessment and retrofitting of buildings, reflects the latest tendencies in. Relevance of a wide spread analysis approach has been pointed out also by mallardo et al. The objective of this paper is to assess the seismic performance of existing residual buildings in the sudan. A seismic retrofit of a building is a viable option if some economic benefit can be gained as a result of the retrofit. A parametric analysis is conducted to study the feasibility of seismically retrofitting an example building in. It has matured in the recent years to a highly reliable technology. Seismic analysis and retrofitting of a multistorey rc.
Seismic retrofitting techniques linkedin slideshare. The seismic retrofitting of a building is usually the result of a process that, through analysis and evaluation of the current state of its. Seismic analysis and retrofitting of reinforced concrete building in indian seismic zone v. The retrofitting of existing buildings for seismic criteria. Seismic analysis and retrofit design of a historic ncees seismic analysis and retrofit design of a historic substation control building. Seismic retrofitting of existing structures pdxscholar portland. When retrofitting approach is adopted, retrofitted building can still be operated. A local utility company issued a request for proposal to our.
Alquist hospital facilities seismic safety act sb 519 hssa of 1973 established a seismic safety building standards program. Retrofitting will take relatively less construction cost with the same structural performance achievement. Decision analysis for seismic retrofit of structures article in structural safety 312. Using seismic isolation systems for retrofitting historic. The prestandard and commentary for the seismic rehabilitation of buildings fema 356 provides guidance for evaluating the. Seismic design, assessment and retrofitting of concrete buildings. Pdf the approaches to seismic analysis of buildings. Seismic evaluation and retrofit of existing buildings. Analysis of the response of the entire building may not be required. Reconstruction or renewal of any part of any part of a damaged building to provide the same level of strength and ductility is called repairing. Submitted by parwinder kumar classcivil 2 civil 2 roll no.
Pdf seismic retrofitting of reinforced concrete buildings using. Analytical study on seismic retrofitting of reinforced concrete buildings using steel braces with shear link. Pdf past earthquakes have emphasized the vulnerability of existing structures. Catolica del peru to form the seismic retrofitting project srp. This site is like a library, use search box in the widget to get ebook that you want. Decision analysis for seismic retrofit a thesis by. The proposed retrofitting schemes are based on predicted behavior of this class of buildings which is based on observed behavior in the past earthquakes.
Earthquake load is generated from the site seismicity, mass of the structures, important of buildings, degree of seismic resistant, etc. The retrofit techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms. A benefitcost model for the seismic rehabilitation of buildings. Furthermore, the structure contains many outrigger bents, in which columns are displaced from their ideal locations to accommodate passage of railroad tracks beneath the structure. The pushover analysis can give valuable information about performance of building in expected future seismic events. Seismic evaluation and retrofitting are undertaken for the life line buildings, such as hospitals, police stations, fire stations, major administrative buildings, schools, educational buildings, historical monuments etc. Seismic retrofitting consists of one or more structural interventions developed to improve the resistance of existing buildings to seismic loads. Seismic retrofitting is a suitable technology for protection of a variety of structures.
So the elastic load effects that are obtained are multiplied by the load factors to obtain the capacity requirements. Regulatory environment economic impact analysis 54 economic and policy analysis group 10 seismic retrofitting hssa 1973 hssa of 1973. At the onset of this project, it was hoped that an existing benefitcost model could be modified and applied to the seismic rehabilitation of existing buildings. The seismic retrofit of historic buildings is as much an art as it is a science. Ppt on retrofitting concrete beam structure free 30. Seismic analysis and retrofitting of a multistorey rc building. Necessity of seismic evaluation building because of lack of timely revise code, lack of timely revision of seismic zone map.
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. Pushover analyses, seismic vulnerability, seismic retrofitting, base isolation. 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. The following sections explain the various approaches to seismic analysis as applied to multistoried rc buildings. Decision analysis for seismic retrofit a thesis by ryan j. Retrofit existing frame structures to increase their economy. Retrofitting will involve relatively less resources, either human resources or natural resources. Walters has been in private practice for over 30 years, focusing on the application of the seismic protective systems for numerous significant. The seismic retrofitting of reinforced concrete buildings not designed to withstand seismic action is considered. Due to the variety of structural condition of building, it is hard to develop typical. Seismic design of buildings worked examples worked examples presented at the workshop ec 8. Example 2 is a chapel in a university built in 1920. The approaches to seismic analysis of buildings article pdf available.
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. Advanced design examples of seismic retrofit of structures provides insights on the problems associated with the seismic retrofitting of existing structures. But, the expertise needed is not available in the basic level. Seismic evaluation retrofitting of existing building. It also describes how the linear analysis may be followed by the pushover analysis in order to estimate the seismic resistance of retrofitted structure. Seismic evaluation and retrofitting of existing hospital. The probabilities of failure and generalized reliability indices are calculated for the identical structures in both locations. 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. This paper aimed to investigate the seismic response of reinforced concrete rc frame buildings under linear and nonlinear dynamic analysis. Review report for rfcs steelretro steel solutions for the seismic retrofit and upgrade of existing constructions. 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. Seismic retrofitting of buildings linkedin slideshare.
Once the decision is made, seismic retrofitting can be performed through several methods with various objectives such as increasing the load, deformation. Seismic retrofitting is the improvement technique over the. Pushover analysis and seismic retrofitting using shear walls. 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. Conclusion seismic retrofitting techniques for concrete structures. This bill would state the intent of the legislature to enact legislation to encourage seismic safety retrofitting of buildings and homes. Following the publication of eneurocode 8 in 200405, 30 countries are now. Determine as accurate as possible how the building behave when shaken by an earthquake check the building check building material quality list all component of the building that are damaged 1. So, it is high time for the civil engineers to take this issue as a serious matter and they must think of some alternatives of saving human lives as well. The target audience of the book is practicing seismic structural engineers and architects, in addition to students and teachers of engineering and architecture colleges striving to understand seismic behaviour, analysis and design of buildings. Abstract seismic analysis is a part of structural analysis and it deals with the calculation of the response of a building structure to earthquake. Retrofit the mitigation of deficiencies identified in the tier 1 screening evaluation an approach to evaluation in which complete analysis of the response of the building to seismic hazards is performed, implicitly or explicitly recognizing non linear response. Guidelines for seismic evaluation of existing buildings.
A parametric analysis is performed to determine the effects that achievable loss reduction, investment return period, and retrofit cost have on the economic feasibility of seismic retrofitting in memphis and san francisco. Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Bill analysis todays law as amended compare versions status comments to author. Seismic analysis and retrofit study of the sr 99spokane. After briefly introducing how seismic action is described for design purposes, methods for assessing the seismic vulnerability of existing buildings are presented. The benefitcost models presented in this report are the result of an extensive, twoyear research and development project. Buildings 2012, 2 65 unknowns affecting the mechanic properties of the materials.
1111 271 1124 806 1372 981 323 1281 841 86 1010 348 941 350 779 561 145 1123 1248 787 568 1300 712 1207 972 62 599 644 1429 241