Half-joints in reinforced concrete (RC) bridges represent structural discontinuities that can significantly influence long-term safety. Although their isostatic configuration limits internal restraint forces, it 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 time-varying target reliability indexes and attention thresholds to support life-cycle management and decision-making. A time-dependent reliability assessment is conducted using Monte Carlo simulations, providing estimates of the reliability index evolution 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.