What happens to the glue used to hold the Gusset Plate when exposed to heat or flame?

• A. It strengthens
• B. It remains unchanged
• C. It evaporates instantly
• D. It weakens

Answer: (D)

When exposed to heat or flame, the glue binding the Gusset Plate loses its bonding strength. Adhesives are designed to hold components together under normal conditions, but high temperatures soften or break down the polymer bonds, reducing the glue’s shear and tensile strength. With continued heat, the bond deteriorates and the plate can detach or misalign, compromising the joint. The other options don’t fit because heat does not make the glue stronger, it doesn’t leave the bond unchanged, and it doesn’t simply evaporate instantly in a typical fire exposure—the common result is a weakened joint that can fail.