Double-angle tension members connected on one side of a gusset plate For double angles placed back-to-back and connected to one side of a gusset plate, the allowable working stress corresponding to a given slenderness ratio is reduced to what percentage of the tabulated value?

Introduction / Context:
When double angles are connected to a gusset by only one leg (i.e., both angles connected on the same side), shear lag and eccentricity effects reduce the effective capacity. Classic specifications apply a reduction factor to the allowable stress.

Given Data / Assumptions:

• Double-angle member, back-to-back configuration.
• Connected by one leg only to one side of a gusset.
• Working-stress design context.

Concept / Approach:
The reduction accounts for uneven stress distribution and shear lag in outstanding legs. A commonly adopted allowance is to reduce the allowable stress to about 80% of the value applicable to fully balanced connections.

Step-by-Step Solution:
Identify connection eccentricity/shear lag → stress reduction needed.Apply standard reduction → about 80% of the tabulated allowable stress.

Verification / Alternative check:
Design handbooks show factors (≈0.8) for single-sided connections of double angles to reflect reduced effectiveness of outstanding legs.

Why Other Options Are Wrong:

• 60–70%: overly severe for standard double-angle details.
• 50% or 40%: excessively conservative and not typical of code guidance.

Common Pitfalls:
Neglecting reduction for single-sided connections can unconservatively overestimate tension capacity.

Final Answer:
80%