Bridge maintenance, safety, management, life-cycle performance and cost : proceedings of the Third International Conference on Bridge Maintenance, Safety and Management, Porto, Portugal, 16-19 July 2006 - Cruz, Paulo J. S.; Cruz, Paulo J. S.; Frangopol, Dan M.; Frangopol, Dan M.; Neves, Luis C.; Neves, Luis C. (Taylor & Francis, 2006)