Following a major earthquake, an engineering team inspects two severely damaged buildings. Building A, constructed primarily of unreinforced masonry, experienced sudden, catastrophic collapse with no warning. Building B, a steel-framed structure, sustained severe permanent deformations (bent columns and sagging beams) but remained standing, allowing occupants to evacuate. Explain the fundamental material property that accounts for the difference in performance.

An architect requests a floor system with a very long clear span and strict vibration limits (high stiffness). The structural engineer initially specifies an ASTM A36 steel beam. The architect later asks if upgrading the steel to high-strength ASTM A992 will reduce the bouncing/vibration of the floor. How should the engineer respond?

A structural engineer is detailing a commercial building frame. They need to specify the material for the main wide-flange floor beams, the rectangular columns in the glass atrium, and the small connection plates holding everything together. Recommend the appropriate ASTM grades and shapes for these three applications.

A highway overpass requires a clear span of 45 meters. The heaviest available standard W-shape rolled by mills is a W36 (roughly 36 inches deep). Preliminary calculations show this rolled section is severely inadequate for both strength and deflection. Propose a structural solution using steel.

A column must support a dead load ($D$) of $100 \text{ kN}$ and a live load ($L$) of $150 \text{ kN}$. Calculate the required design load using both ASD and LRFD basic load combinations.

A steel roof beam must support a dead load ($D$) of $10 \text{ kN/m}$, a roof live load ($L_r$) of $15 \text{ kN/m}$, and a wind load ($W$) of $12 \text{ kN/m}$. Determine the required LRFD ultimate load ($w_u$).

A steel tensile member has a calculated nominal strength ($T_n$) of $850 \text{ kN}$ based on yielding. Determine the maximum allowable service load ($T_a$) under ASD.