The section of a prestressed box girder is shown. Unit weight of concrete is 20 kN/m3. The total prestressing force is 3400 kN. Assume that there is a loss of prestress of 15% at service loads. Simple span L = 20 m. a.What is the stress at the bottom fibers due to prestress in MPa? b.What is the stress at the top fibers due to prestress in MPa? c.What is the stress at the top fibers at midspan due to combined beam weight and prestressing force, in MPa? d.What additional uniform service load over the entire span will cause zero stress at the bottom fibers at midspan, in kN/m.

The section of a prestressed box girder is shown. Unit weight of concrete is 20 kN/m3. The total prestressing force is 3400 kN. Assume that there is a loss of prestress of 15% at service loads. Simple span L = 20 m. a.What is the stress at the bottom fibers due to prestress in MPa? b.What is the stress at the top fibers due to prestress in MPa? c.What is the stress at the top fibers at midspan due to combined beam weight and prestressing force, in MPa? d.What additional uniform service load over the entire span will cause zero stress at the bottom fibers at midspan, in kN/m.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter7: Length And Length-related Variables In Engineering

Section: Chapter Questions

Problem 42P

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