This load combination is applied to various types of collisions, as well as check floods and certain hydraulic events with a reduced live load other than that which is part of the vehicular collision load, CT

• A. Extreme Event II
• B. Extreme Event I
• C. Service II
• D. Fatigue and Fracture limit states

Answer: (A)

In this context, extreme-event load combinations are used to capture rare, high-impact actions that aren’t part of normal traffic but could govern strength under extraordinary conditions. The scenario described—covering various types of collisions and checks for floods and certain hydraulic events with a reduced live load that isn’t the vehicular collision load—fits the purpose of Extreme Event II. This combination is specifically designed to account for those accidental or environmental extreme actions while using a reduced live load to avoid double-counting with the vehicular collision load. The other options serve different purposes: Extreme Event I covers other kinds of extreme actions, Service II relates to serviceability conditions, and Fatigue and Fracture deals with cyclic loading effects rather than a single catastrophic event.