An unencased steel frame expands or contracts _____ per 100 ft for each 15F change in temperature.

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Prepare for the California Structural Steel Contractor C-51 License Exam. Use our flashcards and multiple choice questions, each with hints and explanations. Ensure you are ready for the exam!

Multiple Choice

An unencased steel frame expands or contracts _____ per 100 ft for each 15F change in temperature.

Explanation:
Steel expands with temperature, and the amount it moves is governed by its coefficient of thermal expansion. For structural steel, about 6.5 × 10^-6 inch per inch per degree Fahrenheit. For 100 ft (1,200 inches) and a 15°F change, the expansion is: 1,200 × 15 × 6.5 × 10^-6 ≈ 0.117 inches, close to 1/8 inch. So an unencased steel frame will expand or contract by roughly 1/8 inch per 100 ft for each 15°F change in temperature. This is why joints and allowances are designed to accommodate such movement.

Steel expands with temperature, and the amount it moves is governed by its coefficient of thermal expansion. For structural steel, about 6.5 × 10^-6 inch per inch per degree Fahrenheit.

For 100 ft (1,200 inches) and a 15°F change, the expansion is:

1,200 × 15 × 6.5 × 10^-6 ≈ 0.117 inches, close to 1/8 inch.

So an unencased steel frame will expand or contract by roughly 1/8 inch per 100 ft for each 15°F change in temperature. This is why joints and allowances are designed to accommodate such movement.

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