1. Insufficient ultimate capacity
2. Poor load combination selection
3. Inadequate durability and fatigue detailing
4. Excessive camber

Explanation

Explanation:
Strength rarely governs long-term performance. Steel bridges often suffer from fatigue-prone details, concrete bridges from inadequate crack control and durability detailing. Poor detailing accelerates deterioration even when strength design is adequate.

Learning Resources:

• CSA S6:19, Clause 10.6 (Durability)