Load-Carrying Capacity of Degraded Dapped-End Beams in RC Bridges (Prepublished)

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Title: Load-Carrying Capacity of Degraded Dapped-End Beams in RC Bridges (Prepublished)

Author(s): Giuseppe Campione and Maria Zizzo

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: corrosion; dapped-end beams; steel bars; strut-and-tie model; viaduct

DOI: 10.14359/51746819

Date: 5/14/2025

Abstract:
Sudden failure of reinforced concrete (RC) dapped-end beams of bridges and viaducts has occurred all around the world in the last few years due to corrosion of steel bars. The danger of sudden and brittle failure is often due to pitting corrosion of steel bars, concrete crushing, and loss of bond in steel bars. In this paper, the risk of failure of reinforced dapped end supports at the ultimate state under vertical and lateral loads is investigated, focusing on the consequences of pitting corrosion and loss of bond in steel bars. A simplified strut-and-tie model was developed to predict the load-carrying capacity of dapped-end supports. The model includes the effects of corrosion of steel bars, loss of bond, and concrete crushing due to the biaxial state of stresses. Several laboratory experimental tests regarding the flexural behavior of RC beams with dapped-end supports were collected to validate the proposed model.


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