A.A steel frame is shown below. The floor load tributary to each frame is 48,000 lb. The fundamental period (sec) of vibration is most nearly: A. 0.1 B. 0.2 C. 0.3 D. 0.4 B. A concrete bridge deck is exposed to freezing and thawing conditions, with moisture and deicing chemical present continuously. Twenty-eight-day compression strength fc_ = 6,000 psi. Aggregate size = 1 in. The minimum air content (%) is most nearly: A. 2 B. 3 C. 4 D. 5
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