SED 12 (ePDF) Case Studies of Rehabilitation, Repair, Retrofitting, and Strengthening of Structures

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This document provides case studies of structural rehabilitation, repair, retrofitting, strengthening, and upgrading of structures, which might be encompassed – in short – by the convenient umbrella terms “Conservation / Upgrading of Existing Structures”. The selected studies presented in this SED cover a variety of structural types from different countries. Strengthening and rehabilitation of structures is usually a challenge because of uncertainties associated with old structures and difficulties due to restrictions on the geometry and materials used, as well as other structural or functional constraints. When repairing an existing structure the engineers involved have plenty of possibilities, lots of constraints, and in some cases there are no applicable codes. Strengthening and rehabilitating is sometimes a complex and exciting work; an art.
The book is a summary of practices to help structural engineers. The reader of this book will discover different approaches to put forward strengthening or rehabilitation projects. Even identical technical problems could have very different efficient solutions, as discussed in the papers, considering structural, environmental, economic factors, as well as contractor and designer experience, materials, etc.

ISBN 978-3-85748-124-6


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This monograph provides case studies of structural rehabilitation, repair, rehabilitation, strengthening, and upgrading of structures, which might be encompassed – in short – by the convenient umbrella terms “Conservation / Maintenance / Preservation / Upgrading of Existing Structures”. Other umbrella terms for the activities related to maintaining and/or improving the structural performance of existing structures include: Restoration, Structural Renovation, Remedial actions. Rehabilitation and retrofit are sometimes used also as umbrella/generic terms. Terminology is discussed in more detail in the “Introduction”. The selected studies presented in this IABSE SED (Structural Engineering Document) cover a variety of structural types from different countries. SED 12 has been prepared as a joint activity between two IABSE Working Commissions WC3: Concrete Structures, and WC4 (formerly WC8): Operation, Maintenance and Repair of Structures.
A large part of existing buildings, bridges and other structures may have a long service life, where they could be subjected to severe environmental and/or operational conditions. These structures represent a strategic heritage of our societies and have an enormous economic value. Due to deficient or absent maintenance, changed operational conditions, new functional requirements, new code provisions, and/or safety necessities, a large number of structures could require to be structurally strengthened, repaired, upgraded, widened, refurbished, reutilized, or rehabilitated. In most of the cases repair / modification is more convenient than replacement.
Strengthening, rehabilitation, repair, and retrofitting of structures is usually a challenging task because of uncertainties associated with old structures, restrictions on the geometry and materials  used, and other structural or functional constraints. When repairing / upgrading the structural performance of an existing structure, the engineers involved have plenty of possibilities, lots of constraints, and in some cases there are no applicable codes. Strengthening, rehabilitation, repair, and retrofitting is sometimes a complex and exciting work; an art. Restoration, structural renovation, and upgrading of structures is also involving enormous professional responsibility. This monograph is a summary of practices to help structural engineers. The reader will discover different approaches to put forward strengthening or rehabilitation projects. Even identical technical problems could have very different efficient solutions when considering the structural, environmental, and economic factors, as well as contractor and designer experience, materials, etc.
It was the initial intention for this SED to focus on concrete structures, with the hope that a future SED would cover other construction materials. Hence, the papers included in this monograph deal with Concrete Structures only. However, as the SED Editorial Board is planning for continuous addition of new case studies on conservation / upgrading of structures, through an electronic version of documents presented in this monograph, the SED Editorial Board requested that the scope of SED should be widened to cover other construction materials as well. Hence the title of the document was changed: “Concrete Structures” being replaced by “Structures”.