26.1.1 - Materials
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Practice Questions
Test your understanding with targeted questions
What does prestressed concrete aim to prevent?
💡 Hint: Think about the purpose of prestressing.
What is an important property of materials used in prestressing?
💡 Hint: Focus on the strength of steel.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the maximum compressive strength of prestressed concrete?
💡 Hint: Consider the capacity advantage over traditional concrete.
True or False: High yield stress steel is used to minimize crack widths.
💡 Hint: Think about the purpose of high-strength materials.
1 more question available
Challenge Problems
Push your limits with advanced challenges
A prestressed concrete beam has an initial prestress of 160 ksi but experiences a loss of 25 ksi due to creep and steel relaxation. What is the effective residual stress?
💡 Hint: Subtract the losses from initial prestress.
If a strand composed of 7 wires has an initial stress of 150 ksi and has a relaxation loss of 10 ksi, is the remaining stress sufficient for a design requiring a minimum of 130 ksi?
💡 Hint: Keep track of the stress after relaxation to ensure it meets design requirements.
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