Dowel action of the tensile reinforcement in RC beams without shear reinforcement: Novel experimental investigation and mechanical modelling

Frederik Autrup*, Henrik Brøner Jørgensen, Linh Cao Hoang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

35 Downloads (Pure)

Abstract

Dowel action is a well-known phenomenon in shear-related problems within structural concrete. The tests previously reported in the literature to evaluate this contribution in reinforced concrete beams without shear reinforcement were conducted without any initial activation of the tensile reinforcement.

This paper presents the experimental results of dowel tests, performed in a novel experimental test setup. The test setup reflects more realistically the conditions of the tensile reinforcement in reinforced concrete beams without shear reinforcement. The test setup enables a realistic tensile activation of the longitudinal reinforcement before applying the dowel force.

The tests show that even a low activation of the tensile reinforcement results in the development of horizontal- and inclined cracks, even before the dowel force is applied. This shows that the contribution from dowel action of the tensile reinforcement is not just simply governed by the splitting strength of the concrete cover.

A method to determine the displacement of the dowel from photogrammetric measurements is presented. In addition, a linear elastic- and a rigid-plastic mechanical model are presented for estimating the shear force transferred by the tensile reinforcement in RC beams without shear reinforcement. The estimates are based on measurements of the dowel displacement. Comparison of the presented model and the experimental results shows fairly good agreement.

Original languageEnglish
Article number115471
JournalEngineering Structures
Volume279
Number of pages13
ISSN0141-0296
DOIs
Publication statusPublished - 15. Mar 2023

Fingerprint

Dive into the research topics of 'Dowel action of the tensile reinforcement in RC beams without shear reinforcement: Novel experimental investigation and mechanical modelling'. Together they form a unique fingerprint.

Cite this