Experimental investigations on the reusability of bearing resistant joints made of High Strength Steel

Abstract
The reusability of structural elements is considered as one of the most promising strategies to reach the carbon neutrality of the civil engineering sector in 2050, as recommended in the Paris agreement. The structural joints are identified as key elements to promote the demountability and reusability of structures. However, beyond regulatory barriers to reuse, some mechanical phenomena require to be mastered, such as the bolt hole deformation in bearing‐type connections and, in particular, the development of remanent plastic deformation, which is a key parameter to be mastered to ensure an easy and safe reuse of connecting elements in future applications.
In this context, the present paper reports on the results of an experimental campaign, in which a serie of bearing tests were conducted on plates made of S355 and S460 steel grades with non‐prestressed bolts. The objectives of these tests are triple: (i) to assess the bearing deformation on the bolt hole for plates made of S460; (ii) to compare the bearing behaviour between normal steel grades (S355) and high‐strength steel (S460) and (iii) to derive a preliminary criterion to limit the bolt hole deformation.