Which design approach explains why Division 2 typically allows higher allowable stress than Division 1?

Which design approach explains why Division 2 typically allows higher allowable stress than Division 1?

• A. Design by analysis is used
• B. Conservative safety factors
• C. Higher quality materials
• D. Empirical rules

Answer: (A)

The main idea is that Division 2 uses design by analysis, which lets you justify higher allowable stresses through detailed calculations of actual geometry, loads, and material behavior rather than relying on broad rules. In this approach, stresses are computed with procedures that account for the real stress flow, welds, joints, and fabrication effects, and the code sets allowable limits based on those analyses. Because you replace conservative empirical rules with validated analytical results, you can support greater stresses for many configurations in Division 2. Division 1, by contrast, relies on empirical rules and larger safety factors, which impose more conservative limits regardless of a specific geometry or load case. So, the ability to perform precise, validated analyses is why Division 2 typically allows higher allowable stress than Division 1.

The main idea is that Division 2 uses design by analysis, which lets you justify higher allowable stresses through detailed calculations of actual geometry, loads, and material behavior rather than relying on broad rules. In this approach, stresses are computed with procedures that account for the real stress flow, welds, joints, and fabrication effects, and the code sets allowable limits based on those analyses. Because you replace conservative empirical rules with validated analytical results, you can support greater stresses for many configurations in Division 2. Division 1, by contrast, relies on empirical rules and larger safety factors, which impose more conservative limits regardless of a specific geometry or load case. So, the ability to perform precise, validated analyses is why Division 2 typically allows higher allowable stress than Division 1.