Shear behaviour of RC-UHPFRC composite beams without transverse reinforcement

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Sine, A (Autor) Outra; Mário Jorge Pimentel (Autor) FEUP; Sandra Nunes (Autor) FEUP; Dimande, A (Autor) Outra

Revista

Título: Engineering Structures

Vol. 257

ISSN: 0141-0296

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

ISI Web of Science

Scopus - 0 Citações

Clarivate Analytics

Outras Informações

ID Authenticus: P-00W-7N9

DOI: 10.1016/j.engstruct.2022.114053

Abstract (EN): Strengthening existing reinforced concrete (RC) beams and slabs using a thin layer of ultra-high performance fibre reinforced cementitious composites (UHPFRC), plain (U) or reinforced (RU) with ordinary steel bars, has been shown to be a very effective way of increasing the flexural capacity in hogging moment regions. However, as the increase in the flexural strength can be very significant, the shear strength of the composite RC-RU or RC-U elements may govern the capacity of the strengthened element and must be conveniently assessed to provide suitable design recommendations. In this regard, the available experimental evidence concerning the shear strength of beams (or one-way shear strength for slabs) is relatively limited. In this work, the results of an experimental campaign are presented where the influence of important parameters was systematically evaluated, namely the reinforcement ratios in the original RC beam and the new UHPFRC layer, the size effect, the thickness of the UHPFRC layer and the sign of the being moment -hogging or sagging -changing the state of stress in the UHPFRC layer from tensile to compressive. The structural behaviour is discussed, and an analytical approach for calculating the shear strength is evaluated.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 19