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UID:62-129@ggbr.r9-asce.org
DTSTART;TZID=America/Los_Angeles:20250121T170000
DTEND;TZID=America/Los_Angeles:20250121T190000
DTSTAMP:20250105T235336Z
URL:https://ggbr.r9-asce.org/events/the-new-san-francisco-oakland-bay-brid
 ge-self-anchored-suspension-sas-bridge/
SUMMARY:The New San Francisco-Oakland Bay Bridge Self-Anchored Suspension (
 SAS) Bridge
DESCRIPTION:The new San Francisco-Oakland Self-Anchored Bay Bridge (SAS) is
  the longest span bridge of its kind\, featuring a single-tower\, self-anc
 hored suspension design with a twin orthotropic box girder deck. This icon
 ic bridge\, with its modernistic appearance\, embodies the San Francisco B
 ay Area’s passion for innovation and aesthetics. It garnered worldwide i
 nterest during construction due to the engineering ingenuity required to o
 vercome challenges in designing\, fabricating\, and erecting a single-towe
 r bridge with a 3-dimensional cable system and sloping hangers to support 
 the orthotropic steel deck. This design eliminated the need for massive gr
 avity anchors\, thereby minimizing the bridge's footprint and reducing its
  impact on the bay water and marine life.\n\nThe SAS features a single\, 4
 \,550-foot-long cable—the longest looped suspension cable ever used for 
 a bridge. The cable extends from the top of the tower and loops back benea
 th the west end\, with slender suspender cables attaching the main cable t
 o the girders beneath the roadway deck. Unlike other Bay Area suspension b
 ridges\, such as the Golden Gate Bridge\, which have cables and hangers in
  a single (2-dimensional) plane\, this design supports a unique 3-dimensio
 nal structure.\n\nThe presentation discusses the aesthetic and technologic
 al advantages of the self-anchored bridge design. Salient features of the 
 bridge include:\nDesigned to withstand seismic loads expected in a 1\,500-
 year return period.\nThe first suspension bridge with no direct connection
  between the deck and tower.\nThe first use of seismic energy-absorbing sh
 ear link beams in the tower of a cable-supported bridge\, featuring a sing
 le continuous cable that supports the structure.\nA single tower with a un
 ique saddle design that incorporates two saddles.\nState-of-the-art hinge 
 pipe beams at the expansion joints between the SAS and adjoining bridge fr
 ames.\nSpecial bearings and shear keys designed to resist AASHTO loads and
  movements.\nThe bridge’s silhouette resembles a harp\, with its single 
 tower composed of four legs and main cable suspenders. This design beautif
 ully symbolizes the Bay Area’s belief in unity in diversity.
ATTACH;FMTTYPE=image/jpeg:https://ggbr.r9-asce.org/wp-content/uploads/site
 s/62/2024/11/January-21-Final.jpg
CATEGORIES:Golden Gate Branch
LOCATION:San Francisco Public Library\, 100 Larkin St.\, San Francisco\, Ca
 lifornia\, 94102\, 9\, United States
GEO:37.778956;-122.415889
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=100 Larkin St.\, San Franci
 sco\, California\, 94102\, 9\, United States;X-APPLE-RADIUS=100;X-TITLE=Sa
 n Francisco Public Library:geo:37.778956,-122.415889
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