Where do tension cracks begin in an unreinforced beam when loaded?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the California Reinforcing Steel Contractor Exam. Get ready with multiple choice questions, in-depth explanations, and comprehensive study tools. Start improving your test scores today!

Multiple Choice

Where do tension cracks begin in an unreinforced beam when loaded?

Explanation:
When a beam bends under load, the top fibers are in compression and the bottom fibers are in tension. Concrete isn’t strong in tension, so cracks start where the tensile stress first exceeds the material’s ability to carry it—the bottom surface of the beam. This is especially true near mid-span where the bending moment is greatest, so tension cracks typically initiate at the bottom in the tension zone and then propagated upward.

When a beam bends under load, the top fibers are in compression and the bottom fibers are in tension. Concrete isn’t strong in tension, so cracks start where the tensile stress first exceeds the material’s ability to carry it—the bottom surface of the beam. This is especially true near mid-span where the bending moment is greatest, so tension cracks typically initiate at the bottom in the tension zone and then propagated upward.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy