# Correct Answer: **High over supports and low at midspan** --- # Explanation In a continuous beam, tendons (prestressed cables) are typically **high over supports and low at midspan** to counteract the bending moments experienced at different points of the beam. --- # Step-by Solution ### 1. Understanding Bending Moments in a Continuous Beam - **At midspan:** The bending moment is **positive**, causing **sagging**. - **Over supports:** The bending moment is **negative**, causing **hogging**. ### 2. Tendon Profile for Prestressing - To **counteract** these moments, tendons are **tensioned** in a specific profile. - **High over supports:** To generate a **compression** that counteracts hogging moments. - **Low at midspan:** To generate a **compression** that counteracts sagging moments. ### 3. Why Tendons Are Not Flat Throughout - A flat profile would not provide the necessary variation in prestressing force to effectively counteract the bending moments at different points. ### 4. Why Tendons Are Not Randomly Distributed - Proper structural design requires a **predictable** and **optimized** tendon profile for safety and efficiency. --- # Why Other Options Are Incorrect | Option | Explanation | |---------|--------------| | **Low over supports and high at midspan** | Opposite of typical prestressing profile; would not effectively counteract the hogging moments at supports. | | **Flat throughout** | Does not provide the variable prestress needed to counteract the varying bending moments. | | **Randomly distributed** | Lacks the systematic profile necessary for structural stability and efficiency. | --- # Final Answer **High over supports and low at midspan**