{"id":null,"ids":[],"kind":"named in documents","name":"Golden Gate Bridge main tower","tied_by":"name","block":null,"release":"v0.7.1","rows_columns":["t","id","year","y","date","kind","topic","outcome","summary","tier","source","leaf","scan","addr","quote","note","title","how","g","rec","sc"],"rows":[["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:31/1",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: stress conditions in parts of the main tower exceed yield or buckling limits (Baron study)","unverified","C123303273",31,"https://archive.org/details/C123303273/page/n30",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:31/3",1990,1990,"","finding","study or report",null,"Golden Gate Bridge tower end-restraint · finding: tower end-restraint assumed by Baron cannot possibly be attained","unverified","C123303273",31,"https://archive.org/details/C123303273/page/n30",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:64/10001",1990,1990,"","building","study or report",null,"Golden Gate Bridge main tower shaft · other: 96 hold-down steel angles riveted to tower shaft web plates","unverified","C123303273",64,"https://archive.org/details/C123303273/page/n63",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:64/10002",1990,1990,"","building","study or report",null,"Golden Gate Bridge main tower shaft · other: 78 steel dowels providing positive shear connection","unverified","C123303273",64,"https://archive.org/details/C123303273/page/n63",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:64/3",1990,1990,"","building","study or report",null,"Golden Gate Bridge main tower base connection · other: 96 hold down steel angles riveted to the web plates of the tower shaft","unverified","C123303273",64,"https://archive.org/details/C123303273/page/n63",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:64/4",1990,1990,"","building","study or report",null,"Golden Gate Bridge main tower base connection · other: 78 steel dowels providing positive shear connection",null,"C123303273",64,"https://archive.org/details/C123303273/page/n63",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:65/3",1990,1990,"","building","study or report",null,"Golden Gate Bridge main tower shaft · other: hold-down angles pre-stretched to 105 kip before riveting","unverified","C123303273",65,"https://archive.org/details/C123303273/page/n64",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:67/10001",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: Computed and measured tower periods correlate very closely, validating the computer model","unverified","C123303273",67,"https://archive.org/details/C123303273/page/n66",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:67/4",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower model · finding: computed and measured tower periods closely correlate, validating the computer model","unverified","C123303273",67,"https://archive.org/details/C123303273/page/n66",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:68/2",1990,1990,"","measure","study or report",null,"Golden Gate Bridge main tower · other: Modal damping ratio 1.3% for first longitudinal tower mode (T = 1.332 sec.)","unverified","C123303273",68,"https://archive.org/details/C123303273/page/n67",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:68/3",1990,1990,"","measure","study or report",null,"Golden Gate Bridge main tower · other: Modal damping ratio 2.2% for first transverse tower mode (T = 2.1845 sec.)","unverified","C123303273",68,"https://archive.org/details/C123303273/page/n67",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:68/4",1990,1990,"","measure","study or report",null,"Golden Gate Bridge main tower · other: Modal damping ratio 1.3% for first torsional tower mode (T = 1.2136 sec.)","unverified","C123303273",68,"https://archive.org/details/C123303273/page/n67",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:68/5",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · other: Damping ratios up to 5% for longer period modes (T = 5 sec.) involving tower and suspended structure","unverified","C123303273",68,"https://archive.org/details/C123303273/page/n67",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:68/6",1990,1990,"","recommendation","study or report",null,"Golden Gate Bridge main tower · other: Modal damping ratio of 3% expected in the period range of 1 to 2 seconds","unverified","C123303273",68,"https://archive.org/details/C123303273/page/n67",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:74/2",1990,1990,"","building","study or report",null,"Golden Gate Bridge · finding: Maximum additional cable force induced by vertical earthquake excitation near the main tower: 10,539 kip","unverified","C123303273",74,"https://archive.org/details/C123303273/page/n73",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,3.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:94/1",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: Uplifting of the base plate occurred initially at the west edge of the west shaft when 52% of the displacement amplitude was imposed","unverified","C123303273",94,"https://archive.org/details/C123303273/page/n93",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:94/2",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: First hold-down rivet connection shear failure occurred when 78% of the displacement amplitude was imposed","unverified","C123303273",94,"https://archive.org/details/C123303273/page/n93",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:94/3",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: Two-thirds of the rivet connections in the west shaft failed in shear and 30 of the 42 filaments uplifted","unverified","C123303273",94,"https://archive.org/details/C123303273/page/n93",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:94/4",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: The maximum compressive stress in the east shaft was 20.3 ksi","unverified","C123303273",94,"https://archive.org/details/C123303273/page/n93",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:94/5",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower · finding: maximum compressive stress at the base of the east shaft was 17.2 ksi","unverified","C123303273",94,"https://archive.org/details/C123303273/page/n93",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:98/5",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower base · finding: rotational ductility demand about 2.2 at upper level earthquake (475-year return period)","unverified","C123303273",98,"https://archive.org/details/C123303273/page/n97",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,3.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:98/6",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower base · finding: about half of base section under each shaft uplifted under rocking response","unverified","C123303273",98,"https://archive.org/details/C123303273/page/n97",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:98/7",1990,1990,"","finding","study or report",null,"Golden Gate Bridge main tower shaft · finding: local buckling and tensile yielding in web plate under maximum credible earthquake","unverified","C123303273",98,"https://archive.org/details/C123303273/page/n97",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,3.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C123303273:63/1",1990,1990,"1990","finding","study or report",null,"Golden Gate Bridge main tower · finding: massive concrete pier and rock foundation have practically no effect on tower response","unverified","C123303273",63,"https://archive.org/details/C123303273/page/n62",null,null,null,"Golden Gate Bridge seismic evaluation","n","a",0,-1.0]]}