1. Reduced dead load
2. Reduced fatigue demand
3. Differential stiffness and load sharing challenges
4. Reduced longitudinal forces

Explanation

New and existing structural components may have different stiffness, requiring compatibility checks and redistribution analysis.

Learning Resources:
• CSA S6 – Rehabilitation provisions
• CHBDC: https://spannovationschool.thinkific.com/courses/CSCBD1