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• Daily ridership approximately 690,000
• Prior to construction start, a subway project of this scale considered unfeasible
• Construction governed by Fine Arts Commission
• All subsurface stations have same appearanceSource: WMATA
Scientific• Structure must resist
tremendous loads over wide spans
• Structural coffered cast-in-place concrete arch– Adds stiffness– See Maillart’s Cement Hall,
Nervi’s Gatti Wool Mill Slabs
• Modern tunneling techniques
• Floating concrete slabs to reduce noise and vibration
Source: Billington Slide Library Source: Billington Slide Library
NTS
Loads:
Symbolic
• Model of a modern transportation system
• Model of modern construction project
• DC as a symbol of cultural modernitySource: Langley Creations