A new reliability-based procedure for the life-cycle management of constructions: application to RC bridge half-joint

Half-joints in reinforced concrete (RC) bridges represent structural discontinuities that can significantly influence long-term safety. While their isostatic configuration limits internal restraint forces, it simultaneously increases vulnerability to local failures, potentially leading to global collapse. This study presents a reliability-based framework for assessing the structural performance of RC half-joints over their life cycle, incorporating the effects of time-dependent loads and material degradation. The methodology includes the definition of target reliability indexes dependent over time and attention thresholds to support life-cycle management and decision-making. A time-dependent reliability assessment is conducted using Monte Carlo simulations, providing estimates for the evolution of the reliability index throughout the service life. Structural capacity and load effects are evaluated by means Strut-and-Tie models. The proposed approach improves understanding of the safety margins of aging bridge components and supports maintenance strategies by providing a quantitative basis for prioritizing interventions and life extension, while ensuring acceptable levels of reliability.