Detail :: Data Jembatan

Jembatan Alvord Lake

Panjang8,80 m
Lebar19,52 m
Bentang Terpanjang6,10 m
Kondisi UmumAktif
Jenis JembatanPelengkung
Tanggal Selesai1889
Tanggal Peresmian1889
NegaraUnited States of America
Latitude (GPS)37.7690000000000000
Longitude (GPS)-122.4549000000000100

The Alvord Lake Bridge was the first reinforced concrete bridge built in America. It was built in 1889 by Ernest L. Ransome, an innovator in reinforced concrete design, mixing equipment, and construction systems. The bridge was constructed as a single arch 64 feet (20 m) wide with a 20-foot (6.1 m) span .[1] Ransome is believed to have used his patented cold-twisted square steel bar for reinforcement, placed longitudinally in the arch and curved in the same arc. The face of the bridge was scored and hammered to resemble sandstone, the interior features concrete "stalactites" (some of which have subsequently grown due to redeposition of limestone from the concrete).

E.L. Ransome left San Francisco a few years later, frustrated and bitter at the building community's indifference to concrete construction. Ironically, the city's few reinforced concrete structures, including the Alvord Lake Bridge, survived the 1906 earthquake and fire in remarkable shape, vindicating Ransome's faith in the method.

The Alvord Lake Bridge, which arches over a pedestrian entrance to San Francisco's Golden Gate park, was designated a civil engineering landmark by the American Society of Civil Engineers in the 1970s

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