🔍 Key Concepts

• MODU (Mobile Offshore Drilling Unit) structural members in the transverse (side‑to‑side) direction • Difference between primary support members and secondary support members in deck construction • Location and function of deck beams versus longitudinal supports and vertical supports

💭 Think About

• Think about which member runs between the side frames and directly supports deck beams in that spanwise direction. • Which option describes a longitudinal member at deck level, and which describe vertical or local supports instead? • For each choice, picture whether it mainly carries load along the ship, vertically, or locally at a joint, and decide which best fits continuous support for the beams.

✅ Before You Answer

• Verify which element is a longitudinal deck-level member that runs parallel to the side and supports deck beams. • Eliminate options that are primarily vertical supports or local reinforcements rather than continuous beam support. • Confirm whether the correct member is typically shown on deck plans as a line running fore‑and‑aft near the side shell, under the ends of deck beams.