Case Study 2 (print) Case Studies

Regular Price 39.98 incl.VAT

IABSE Members receive discount for this SED. Kindly fill out the form below and we’ll contact you.

Case Studies on Conservation and Seismic Strengthening/Retrofitting of Existing Structures

Recent earthquakes have demonstrated that despite the continuous developments of novel materials and new strengthening techniques, the majority of the existing structures are still unprotected and at high seismic risk. The repair and strengthening framework is a complex process and there are often barriers in the preventative upgrade of the existing structures related to the cost of the applications and the limited expertise of the engineers. The engineers need to consider various options thoroughly and the selection of the appropriate strategy is a crucial parameter for the success of these applications. The main aim of this collection is to present a number of different approaches applied to a wide range of structures with different characteristics and demands acting as a practical guide for the main repair and strengthening approaches used worldwide. This document contains a collection of nine case studies from six different countries with different seismicity (i.e. Austria, Greece, Italy, Mexico, Nepal and New Zealand). Various types of structures have been selected with different structural peculiarities such as buildings used for different purposes (i.e. school buildings, town hall, 30 storey office tower), a bridge, and a wharf. Most of the examined structures are Reinforced Concrete structures while there is also an application on a Masonry building. For each of the examined studies, the local conditions are described followed by the main deficiencies which are addressed. The methods used for the assessment of the in-situ conditions also presented and alternative strategies for the repair and strengthening are considered.

ISBN 978-3-85748-173-4








Description

Conservation and Seismic Strengthening/ Retrofitting of Existing Structures

The repair and strengthening of existing structures is an urgent need worldwide, especially in earthquake prone areas. Recent earthquakes have demonstrated that despite the continuous developments of novel materials and new strengthening techniques, the majority of the existing structures are still unprotected and at high seismic risk. Most of the existing structures need to be structurally upgraded either because they have been damaged during previous earthquakes or because they have been designed without or with old seismic code provisions. The repair and strengthening framework is a complex process, and there are often barriers in the preventative upgrade of the existing structures related to the cost of the applications and the limited expertise of the engineers.
The selection of the appropriate method each time is dependent on a large number of parameters such as the local environmental and geotechnical conditions, the type of the structure, the material characteristics and the condition of the existing structural elements, the availability of materials and technologies, the purpose of the structure, and the seismicity of the area. Therefore, the conservation and strengthening of an existing structure is an open-ended project. The engineers need to consider various options thoroughly, and the selection of the appropriate strategy is a crucial parameter for the success of these applications.

Another challenging part is the evaluation of the condition of the existing structures. In most cases, the lack of detailed drawings and documentations of the existing old structures, the limited accessibility to “hidden” structural elements, and the uncertainties in the evaluation of the material properties of the existing structures encompasses a high degree of uncertainty. At the same time, the code provisions in this field are quite limited and have been recently developed or are still under development. There are still techniques that are not sufficiently covered by the existing regulations. The design process is, in most cases, not strictly specified by the codes adding an extra layer of complexity to the engineers who do not have the required experience and can only hardly find limited examples of previous applications in the literature.

This document contains a collection of nine case studies from six different countries with different seismicities (i.e. Austria, Greece, Italy, Mexico, Nepal, and New Zealand). Various types of structures have been selected with different structural peculiarities such as buildings used for different purposes (i.e. school buildings, town hall, 30-storey office tower), a bridge, and a wharf.  Most of the examined structures are reinforced concrete structures, while there is also an application on a Masonry building.This document is the second in a series of documents to be published by IABSE in the very important field of “Maintaining and Upgrading the Structural Performance of Existing Structures.” The first document entitled “IABSE SED 12: Case Studies of Rehabilitation, Repair, Retrofitting, and Strengthening of Structures,” was published in 2011, edited by Professor Mourad M. Bakhoum and Dr Juan A. Sobrino. The topic examined is quite broad, and the repair or strengthening techniques is highly dependent on the type of the existing structures and the materials used. Therefore, the development of a potential future collection of case studies focused on the repair and strengthening of additional types of structures, and especially steel construction and bridges would be desirable.

This document follows a consistent format for all the sections of every chapter as proposed by Professor Mourad M. Bakhoum for IABSE SED 12. For each of the examined studies of this document, the local conditions are described followed by the main deficiencies that are addressed. The methods used for the assessment of the in situ conditions are also presented and alternative strategies for the repair and strengthening are examined followed by the structural analysis before and after the structural upgrade. Details about the construction procedures are also presented.
The main aim of this collection is to present a number of different approaches applied to a wide range of structures with different characteristics and demands acting as a practical guide for the main repair and strengthening approaches used worldwide.

 

Additional information

Weight 0.481 kg