Experimental investigations on the bond performance of reinforced concrete beam with lap splices after fire exposure
Year: 2025
Type: article
Abstract: ABSTRACT The manufacturing and transportation limitations necessitate splicing of the reinforcing bars for the construction of most reinforced concrete (RC) structures. Lap splices present a particular challenge in case of a fire incident, as the local damage in the concrete cover region can significantly affect the structural performance. There are multiple studies on post-fire bond behaviour, however, only a few studies focused on its implications at the structural level. In order to bridge this gap, the research reported herein focused on the post-fire performance of lap splices. RC beams without and with tension lap splices were tested in four-point bending, whereby different lap lengths were considered (20–50 times the bar diameter). The beams were exposed to a standard ISO 834 fire for 60 minutes and bending tests were performed in residual state thereafter. To avoid possible explosive spalling, 1kg/m 3 of polypropylene fbers were added to the concrete mix. It is observed that fire has a strong impact on the beams with lap splices whereas beams with continuous reinforcement almost maintain their original flexural capacity in post-fire state. The results are compared with the results obtained in the previous studies by the authors using beam-end specimens. The design concept proposed forms the basis of the new provisions in fib Model Code 2020 for the design of lap splices under fire.
Source: Journal of Building Engineering
Authors: Arunita Das, Josipa Bošnjak, Akanshu Sharma
Institutions: University of Stuttgart, Purdue University West Lafayette
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,940
OpenAlex ID: W7083314177