Assessment of strengthening solutions for the out-of-plane collapse of masonry infills through textile reinforced mortars

• Type: Article in National Scientific Journal
• Date: 2019

Authors

Maria Teresa de Risi (Author) Other; André Furtado (Author) FEUP; Hugo Rodrigues (Author) Other; José Melo (Author) FEUP; Gerardo Verderame (Author) Other; António Arêde (Author) FEUP; Humberto Varum (Author) FEUP; Gaetano Manfredi (Author) Other

Journal

Title: Revista Portuguesa de Engenharia de Estruturas

Serial No. III No. 11

Pages: 35-42

ISSN: 0870-984X

Publisher: LNEC - Laboratório Nacional de Engenharia Civil

Scientific classification

CORDIS: Technological sciences > Engineering > Civil engineering > Structural engineering

FOS: Engineering and technology > Civil engineering

Other information

Resumo (PT): O colapso para fora-do-plano das paredes de alvenaria de enchimento em edifícios existentes de betão armado devido a sismos representa um assunto de extrema importância no que toca à salvaguarda de vidas e estimativa de perdas económicas. Este trabalho apresenta os resultados de uma campanha experimental relativa à avaliação de soluções de reforço desenhadas para mitigar ou evitar o seu colapso. As técnicas de reforço investigadas basearam-se na aplicação de uma camada muito fina de uma argamassa de elevada ductilidade e rede de armação em fibra de vidro com diferentes tipos de ancoragem ao pórtico de betão armado envolvente. As propriedades mecânicas dos materiais adotados, o setup experimental e o procedimento de ensaio serão apresentados ao longo do artigo. Detalhes relativos à eficiência de cada solução de reforço são fornecidos e comparados por forma a dar suporte para a seleção da melhor estratégia para investigações mais detalhadas e futuras aplicações.

Abstract (EN): Out-of-plane (OOP) collapse of infill masonry walls in existing reinforced concrete (RC) buildings due to earthquakes represents a paramount issue for life safety and seismic economic loss estimation. Few studies from literature deal with this topic, particularly regarding possible strengthening strategies to prevent the infills’ OOP collapse. This work presents the first results of a proper experimental campaign about the assessment of different strengthening solutions designed to mitigate or avoid the out-of-plane collapse of masonry infills in existing RC buildings. The investigated strengthening techniques were based on the application of a very thin high-ductility mortar plaster and glass fibre-reinforced polymer nets with different types of anchorage to the surrounding RC frame. Each specimen was built with horizontal hollow clay bricks and was tested through the application of a semi-cyclic OOP displacement pattern by means of uniformly distributed small pneumatic jacks. Mechanical properties of the adopted materials, test setup and procedure are described herein. Tests results are presented and commented in terms of OOP force-displacement responses and damage evolution during the test. Details about the effectiveness of each retrofitting solution are provided and compared to support the selection of the best strategy for further investigations and future applications.

Language: Portuguese

Type (Professor's evaluation): Scientific

No. of pages: 8