Case studies on strengthening of concrete and masonry structures

Antonio Nanni, Andrea Prota


This paper presents a number of case studies related to the strengthening of concrete and masonry structures damaged by the April 6, 2009, Mw 6.3 earthquake that struck the Italian city of L’Aquila and surrounding localities. After a brief overview of the existing challenges in buildings constructed prior to 1972 when the first building code addressing seismic construction was enacted in Italy, the paper describes interventions using technologies that can be considered innovative in that they are not addressed in the majority of the current building codes worldwide. The following strengthening methods are described: a) fiber-reinforced polymer (FRP) composites in the forms of manual lay-up, procured laminates and spikes; b) steel-reinforced polymer (SRP) lay-up and spikes; and, c) fabricreinforced cementitious matrix (FRCM). The paper concludes with a description of how the deployment of innovation for construction takes place in the United States. This example is intended to identify challenges to innovation and a possible method to overcome them.

Palabras clave

composites; concrete; masonry; seismic damage; strengthening

Texto completo:



AC125, “Acceptance Criteria for Concrete and Reinforced and Unreinforced Masonry Strengthening Using Externally Bonded Fiber-reinforced Polymer (FRP) composite systems,” International Code Council – Evaluation Service, Brea, CA.

ACI Committee 440, “Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures,” ACI 440.2R-02 and ACI 440.2R-08, American Concrete Institute, Farmington Hills, MI, 2002 and 2008.

ACI Committee 562, “Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings (ACI 562-13) and Commentary,” ACI 562-13, American Concrete Institute, Farmington Hills, MI, 2013.

CNR DT 200 R1 – 2013, “Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures,” National Research Council, Rome, 10 Oct. 2013.

EERI, “The Mw 6.3 Abruzzo, Italy, Earthquake of April 6, 2009,” Special Earthquake Report — June 2009.

International Code Council, “2015 International Existing Building Code (IEBC),” International Code Council, Country Club Hills, IL, 2014.


Antonio Nanni, PhD, PE, FACI, FASCE, FIIFC is an Inaugural Senior Scholar, Professor and Chair, Department of Civil, Architectural & Environmental Engineering, University of Miami. Dr. Nanni is a structural engineer interested in construction materials, their structural performance, and field application.

Andrea Prota, Ph.D., is a Professor of Structural Engineering at Department of Structures for Engineering and Architecture of the University of Naples - Federico II, Italy


© Universidad Católica de Santiago de Guayaquil