Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads

Version 1 : Received: 31 December 2021 / Approved: 5 January 2022 / Online: 5 January 2022 (13:01:16 CET)

How to cite: Foraboschi, P. Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads. Preprints 2022, 2022010041 (doi: 10.20944/preprints202201.0041.v1). Foraboschi, P. Strengthening of Reinforced Concrete Beams Subjected to Concentrated Loads. Preprints 2022, 2022010041 (doi: 10.20944/preprints202201.0041.v1).

Abstract

Renovation, restoration, remodeling, refurbishment, and retrofitting of build-ings often imply modifying the behavior of the structural system. Modification sometimes includes applying forces (i.e., concentrated loads) to beams that before were subjected to distributed loads only. For a reinforced concrete structure, the new condition causes a beam to bear a concentrated load with the crack pattern that was produced by the distributed loads that acted in the past. If the concentrated load is applied at or near the beam’s midspan, the new shear demand reaches the maximum around the midspan. But around the midspan, the cracks are vertical or quasi-vertical, and no inclined bar is present. So, the actual shear capacity around the midspan not only is low, but also can be substantially lower than the new demand. In order to bring the beam capacity up to the demand, fiber-reinforced-polymer composites can be used. This paper presents a design method to increase the concentrated load-carrying capacity of reinforced concrete beams whose load distribution has to be changed from distributed to concentrated, and an analytical model to pre-dict the concentrated load-carrying capacity of a beam in the strengthened state.

Keywords

building remodeling; concentrated loads; FRP reinforcement; FRP strips; shear capacity, vertical concrete cantilever

Subject

ENGINEERING, Civil Engineering

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