The tasks of the structural engineers are not only designing and building new structures. Increasingly, they are called up to consider the maintenance, repair and rehabilitation of existing structures, both bridges and buildings. The Report presents 239 research and case studies in a field of increasing importance for structural engineers. The themes include:

• inspection methods, assessment, monitoring, maintenance of structures
  
• concrete durability, fatigue issues in bridges, seismic strengthening issues, laboratory studies, dynamic testing and analysis
  
• seismic strengthening of bridges and buildings
  
• general repair and case studies for bridges and buildings
  
• design and construction issues for stay cables
  
• attachment of new materials to existing structures
  
• seismic retrofit of the Golden Gate Bridge
  
• structural implications of the 1995 Kobe Earthquake.