Shear fatigue strength of reinforced concrete members without transverse reinforcement according to the compression chord capacity model. (15th May 2020)

• Record Type: Journal Article
• Authors: Cladera, Antoni; Ribas, Carlos; Oller, Eva; Marí, Antonio
• Is Part Of: Engineering structures. Volume 211(2020)
• Publication Date: 2020-05-15
• Subjects: Fatigue -- Reinforced concrete -- Shear strength -- Beam -- Compression chord -- Mechanical model; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.110495
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The CCCM is extended to assess the fatigue shear strength of RC elements. It is assumed that the shear strength is controlled by the capacity of the compression chord. Three different approaches to take into account the influence of the fatigue are considered. More shear fatigue tests are needed, especially for beams with depths higher than 500 mm. A few number of tested beams that failed on shear are available for log N higher than 6. Abstract: Although the shear fatigue behaviour of elements without shear reinforcement has been studied for a while, there is still a need for a simple mechanical model that evaluates the shear fatigue strength. The Compression Chord Capacity Model (CCCM), previously developed by the authors, is a simplified model for the shear strength prediction of reinforced and prestressed concrete members with and without transverse reinforcement, with I, T or rectangular cross-sections. This model represents a useful tool for structural design and assessment in engineering practice. In this paper, the CCCM has been extended to assess the fatigue shear strength of RC elements. This extension is consistent since the existing observed fatigue failure modes show similarities with the initial assumption of the model, which considers that the member shear strength is controlled by the shear capacity of the flexural compression chord. Three different approaches to take into account the influence of the fatigue have been combined with the CCCM. In general, a good performance of the model combined with the three different approaches was observed when analysing the ratio Vtest /Vpred through a database of 87 tests previously published by other authors, showing a low scatter (<15%) and a significant safety given by the minimum ratio and the 5th percentile.