Part 2 of this manual provides guidance on the assessment and retrofitting of other tyical highway structures. Seismic retrofitting specific advices on building reinforcement best practices are available to inform considerations of seismic retrofitting for multifamily buildings of a particular construction. In the past thirty years, moderate to severe earthquakes occurs around the world every year. It also provides certain aspects of computer software modeling against seismic loads and shows the necessity of seismic upgrading in a steel momentframe building. Retrofitting of existing structures with insufficient seismic resistance accounts for a major portion of the total cost of hazard mitigation. Building materials used in seismic retrofitting should be located on the interior andor blended with existing architectural features.
The seismic strengthening method which raises the intensity and modification performance of a building. This seismic rehabilitation techniques document is part of the national earthquake hazards reduction program nehrp family of publications addressing seismic rehabilitation of existing buildings. It partly absorbs the seismic energy and reduces the motion of buildings. As a practical and economical solution, the retrofit design involved replacement of the existing window frames with structural steel frames constructed from steel csections. Seismic retrofitting technique figure 4 there are many seismic retrofit techniques available, depending upon the various types and conditions of structures.
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. Seismic dampers seismic dampers are used in place of structural elements, like diagonal braces, for controlling damage in structures. Seismic retrofitting techniques civil engineering community. Seismic retrofitting techniques civil engineers pk. For example, seismic retrofitting is generally used for column members and is performed in most cases to improve safety and restorability. Seminar presentation on the basics of seismic retrofit to prevent structural damage to buildings, bridges, etc. Seismic retrofitting of an existing structure 112 of each story. Seismic retrofitting techniques are required for concrete constructions which are vulnerable to damage and failures by seismic forces. The primary purpose of this document is to provide a selected compilation of seismic rehabilitation techniques that are practical and effective.
Seismic retrofitting manual for highway structures. Steel moment frame seismic retrofitting is characterized by the use of a rigid steel frame of beams connected to columns to support the many floors of the structure. Conventional retrofitting methods include addition of new structural elements to the system and enlarging the existing members. This manual, which is comprised of two parts, represents the most current stateofpractice in assessing the vulnerability of highway structures to the effects of earthquakes, and implementing retrofit measures to improve performance. This seismic retrofit guide is designed to promote public safety and welfare by reducing the risk of earthquake induced damage to existing homes. Seismic retrofit services srs retrofit san fernando valley.
Innovative techniques of seismic retrofitting international seminar syracuse sicily 1517 july 2004 conference centre open land via epipoli, 252 siracusa. This document fema308, 1999 consists practical guidance for the repair, upgrade of earthquake damaged. We are a onestop shop that performs everything from structural analysis of the building by a seismic engineer to retrofit completion. Seismic risk factors courtesy of utah division of state. The seismicisolating method which reduces the effect on a building of the shake produced by an. How to retrofit a home for an earthquake ask this old house duration. Some methods are additions of rc structural walls, use of steel bracings, seismic isolation, use of frp and supplemental energy dissipation devices dampers. 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. Assessment of seismic retrofitting techniques of rc. Seismic retrofitting building renovations technology. The retrofit techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms. We specialize in seismic retrofitting on commercial and residential soft story structures.
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. Seismic retrofitting definition, techniques using modern. Introduction the production of gas in the netherland lasts for more than fifty years, which is a result of the extraction from different gas reservoirs spread around the groningen area. 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 retrofitting may target the upgrading of the seismic performance in terms of strength andor ductility fig. The principles and practice of effective seismic retrofitting this is a very rough draft of a book on retrofitting being written by howard cook in collaboration with structural engineers who are members of the structural engineers association of northern california. Seismic retrofit of framed buildings, fibrereinforcedpolymer structure, baseisolated structure, addeddamping structure, nonlinear dynamic analysis. It analyzes these techniques viability from a structural engineering. Part 2 retaining structures, slopes, tunnels, culverts and roadways this report is available only in pdf format. Review of seismic retrofitting strategies for residential. 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. 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. Thus, it is of critical importance that the structures that need seismic retrofitting are identified correctly, and an optimal retrofitting is conducted in a cost effective fashion. Manual on retrofitting of existing vulnerable school buildingsassessment to retrofitting part i iv figure 40 retrofitting works for the trusses and roof providing proper materials and detailing 33 figure 41 finishing works painting, architectural gravel installation, etc 33 figure 42 retrofitting of sd padasuka 2 34.
The focus of this manual is on retrofitting buildings that are subject to flooding. A survey of methods and techniques used for seismic. It describes common seismic rehabilitation techniques used for buildings represented in the set of standard building types in fema seismic publications. 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. Seismic retrofit technology consists of three methods. For buildings with large seismic deficiencies, a combination of conventional and frp strengthening techniques may prove to be an effective retrofitting solution. Pdf seismic retrofitting techniques for historic adobe.
L international journal of civil and structural engineering volume 2 issue 1 2011 58 structural and nonstructural elements. Global strategies may be adopted to enhance the resistance of structures to lateral loads e. Meanwhile, traditional techniques of seismic retrofitting by concrete and steel do not always ensure the desired protection of structures from earthquakes and aftershocks. The seismic evaluation process consists of investigating if the structure meets the defined. In such cases, the primary objective is to increase shear capacity and. Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Model of the structure is the same as for a new building and the contribution of nonstructural elements is neglected. Index seismic retrofitting manual for highway structures. Assessment of prototype buildings etty conservation institute 4.
However, since the current retrofit techniques require much inconvenience 1727. Manual on retrofitting of existing vulnerable school buildingsassessment to retrofitting part i iv figure 40 retrofitting works for the trusses and roof providing proper materials and detailing 33 figure 41 finishing works painting, architectural gravel installation, etc. A survey of methods and techniques used for seismic retrofitting of rc buildings vijayakumar. Also, changes in service conditions, often made arbitrarily, may lead to substantial changes in the structural behaviour resulting in a degradation of the. Techniques for the seismic rehabilitation of existing. Seismic retrofitting approaches to 5 common building types. Challenges of retrofitting historic fabric minimizing noise, disturbance, and damage to the surrounding buildings and providing. The combination of seismic loads and other actions is made according to ec1. The first technique is to jacket the columns and increase their reinforcing bars in order to withstand larger seismic forces through 0. The project includes the development of lowtech, cost. This paper presents a comprehensive overview of the techniques available for the seismic retrofitting of adobe buildings. Such events lead to damage to the concrete structures as well as failures.
135 1228 1351 23 287 463 1086 383 818 37 682 941 188 230 400 1442 174 571 234 1361 529 1431 1105 224 298 867 1044 473 1021