Steel Design Exam 1 Concepts
As yield strength increases from one grade of steel to another (say, from Gr. A36 to A572-50), how will
you expect Young's modulus to vary? - Answer-Young's modulus will stay approximately the same with
increasing yield strength
Which of the following is the correct expression for solving for radius of gyration? - Answer-sqrt(I/A)
If a WT shape was manufactured from a W10x50, what would the shape designation be for the WT? -
Answer-WT5x25
What is one difference between a Factor of Safety (\OmegaΩ) and a Resistance Factor (\phiϕ)? -
Answer-A resistance factor account for uncertainties in resistances, while a factor of safety accounts for
uncertainties in loads and resistances.
A reliability index (\betaβ) is: - Answer-Used in LRFD to measure the number of standard deviations the
failure is from the mean of a probability distribution function accounting for loads and resistances
Which of the following was used in the development of the LRFD design philosophy? - Answer-Statistical
distributions of resistance and loads
Design experience and engineering judgement
Which is the correct relationship for LRFD design? - Answer-∑ γQ ≤ ϕRn
As yield strength increases from one grade of steel to another (say, from Gr. A36 to A572-50), how will
you expect Young's modulus to vary? - Answer-Young's modulus will stay approximately the same with
increasing yield strength
Which of the following is the correct expression for solving for radius of gyration? - Answer-sqrt(I/A)
If a WT shape was manufactured from a W10x50, what would the shape designation be for the WT? -
Answer-WT5x25
What is one difference between a Factor of Safety (\OmegaΩ) and a Resistance Factor (\phiϕ)? -
Answer-A resistance factor account for uncertainties in resistances, while a factor of safety accounts for
uncertainties in loads and resistances.
A reliability index (\betaβ) is: - Answer-Used in LRFD to measure the number of standard deviations the
failure is from the mean of a probability distribution function accounting for loads and resistances
Which of the following was used in the development of the LRFD design philosophy? - Answer-Statistical
distributions of resistance and loads
Design experience and engineering judgement
Which is the correct relationship for LRFD design? - Answer-∑ γQ ≤ ϕRn
