Deflection theory for selfanchored suspension bridges. A suspension bridge usually has main cables else ropes or chains, anchored at each end of the bridge. Aug 31, 2015 the construction of the bridge approach section with twoway sixlane highway, or use the pier for oneself. Selfanchored suspension bridges tu delft repositories. Suspension bridges may also be classified by type of cable anchorage, external or internal. Design method of energydissipating earthquakereduction along longitudinal direction of selfanchored suspension bridgej.
Selfanchored suspension bridges transportation research board. The new selfanchored suspension bridge will be a landmark structure that cre ates a gateway to oakland while remaining in harmony with the rest of the bays suspension bridges. Analysis of selfanchored and groundanchored suspension bridges. Inca rope bridge has features in common with a suspension bridge and predates them by at least three hundred years. If the bridge is built on the waterway, will ship direct to wear off, no physical collisions. For selfanchored suspension bridges having the fabrication camber subjected to live loads, a new deflection theory is formulated after an optimized initial state solution is found under dead loads. Living load nonlinear analysis of selfanchored cable. The bridge is a self anchored suspension cablestay system with single arch pylon and 3 spans steelconcrete composite girder 72.
San francisco oakland bay bridge new self anchored suspension span wind studies final report, january 2002 prepared by t. The self anchored suspension bridge consists of dual box girders suspended from cables which are s upported on single 160 m tower located off of the eastern shore of the yerba buena island. This bridge is three times more costly than any previous caltrans construction project. Design of continuous welded rail on a suspension bridge. Pdf deflection theory for selfanchored suspension bridges. The san franciscooakland bay bridge selfanchored suspension bridge cable suspenders being prepared for installation.
This includes most simple suspension bridges and suspendeddeck suspension bridges, and excludes self anchored suspension bridges. The asymmetrical self anchored suspension sas feature, with its short tower height and other restrictions, has never been attempted before. When completed, the selfanchored suspension span sas will transform the bridges appear ance with its unique, asymmetric design. Illustration of a selfanchored cablestayed suspension bridge. The selfanchored suspension bridge sas superstructure and tower package is for construction of the signature span of the new bridge. The bridge will be constructed using temporary towers and bargemounted. In 1936, the longtime dream of linking the two locations was finally realized, and the nearly 5milelong san franciscooakland bay bridge was officially opened to traffic. The east bay bridge would become the first singletower selfanchored suspension bridge and its scale would make it a unique world class structure. Dynamic analysis of a selfanchored suspension bridgej. In the 10 years following that tragic event, caltrans retrofitted or replaced more than 2,000 bridges and performed work on all 7 stateowned toll bridges in the bay area.
Optimization analysis model of selfanchored suspension bridge. Selfanchored suspension bridges august 7, 2012 selfanchored suspension bridges differ from the type discussed in arts. The sas is a selfanchoring suspension span with one main cable that anchors to the eastern end of the roadway deck, rather than to the ground anchorages. Selfanchored suspension bridges differ from the type discussed in arts. There have not been adequate documents related to the optimization theory of cable tension method of selfanchored suspension bridge. This paper deals with a challenging bridge type, which is not very well known i. Living load nonlinearity of selfanchored cablestayed suspension bridges is studied in this paper. Deflection theory for self anchored suspension bridges under live load. The basic differential equations of selfanchored cable. A selfanchored suspension bridge is a suspension bridge in which the main cables attach to. The asymmetrical selfanchored suspension sas feature, with its short tower height and other restrictions, has never been attempted before. Rigid towers for multispan suspension bridges to provide enough stiffness to the bridge flexible towers are commonly used in long.
San franciscooakland bay bridge seismic retrofit strategy 12 east span seismic replacement project san franciscooakland bay bridge east span replacement project summary 14 yerba buena island detour ybid 15 yerba buena island transition structures 16 self anchored suspension sas bridge 18 sas construction sequence 20. San franciscooakland bay bridge design criteria contract 59a0040 100% submittal san franciscooakland bay bridge east span seismic safety project contract 59a0040 selfanchored suspension bridge design criteria 0711502 100% submittal reference. Self anchored suspension bridges august 7, 2012 self anchored suspension bridges differ from the type discussed in arts. Deflection theory for selfanchored suspension bridges under live load article pdf available in journal of bridge engineering 207. Selfanchored suspension bridges in china request pdf. The east bay bridge would become the first singletower selfanchored suspension bridge and its. Its main span is the longest in the world among all selfanchored suspension bridges constructed using double towers and double cables till.
Toll bridge seismic retrofit program 2010 first quarter risk management report page 2 2 potential draw on program contingency 2. The design is wellsuited for construction atop elevated piers, or in areas of unstable soils where anchorages would be difficult to construct. Since 1999, selfanchored suspension bridges sasbs have undergone rapid development in china, resulting in remarkable technical progresses in many aspects. This engineering and construction marvel raises the bridge building bar to new heights. Nvf annual bridge conference 2014 unique bridges in qatar. Both calculation documents display the finding that. Seminar report on cable suspension bridge to be submitted in partial fulfilment of the requirement for the degree of bachelor of technology in civil engineering under the guidance of dr. Steam workshop single tower selfanchored suspension bridge. Selfanchored suspension bridge design criteria 0711502 100% submittal reference. The static behavior of self anchored cablestayed suspension bridge under vertical load is described with the continuum method. Unlike the externally anchored type, self anchored suspension bridges may properly be analyzed by the elastic theory, since the effect of distortions of the structural geometry under live load is practically eliminated. Self anchored suspension bridges differ from the type discussed in arts.
San franciscooakland bay bridge selfanchored suspension. A pure suspension bridge is one without additional stay cables and in which the main cables are anchored in the ground. Analyze and calculates loads of a suspension bridge and comparing to a cable stayed bridge duration. The experiment is based on longcheng bridge shown in figure 1 across beijinghangzhou canal in changzhou, china. Difference between types of bridges the load path of the selfanchored suspension bridge. Constructing the worlds largest selfanchored suspension. One signature element transforms the san franciscooakland bay bridge into a global icon the selfanchored suspension span sas. The moments and displacements of both the girder and the pylon under live load are.
Repairing the worlds largest selfanchored suspension bridge the concept of constructing a bridge linking san francisco with oakland has existed since the early 1870s. In view of this point, a simplified optimization calculation method of cable force for selfanchored suspension bridge has been developed based on optimization theories, such as minimum bending energy method, and internal force balanced method, influence matrix method. Most suspension bridges are externally anchored earthanchored to a massive external anchorage fig. The konohana bridge in osaka, japan, illustrates this type and provides a case study to compare conventional suspension bridge theory with the results of a finiteelement model. The sas is a self anchoring suspension span with one main cable that anchors to the eastern end of the roadway deck, rather than to the ground anchorages.
Constructing the worlds largest selfanchored suspension bridge laborers carrying cans of grikote anticorrosion paste on the southside span catwalk in the fog, 2012. A self anchored cablestayed suspension bridge with a main span of 800m is analyzed with linear theory, secondorder theory and nonlinear theory respectively. Use the terrain tool will make the pylon with the terrain does not move up and down movement, but the deck. Abstract the new self anchored suspension span of the east san franciscooakland bay bridge is the main subject of study of this research project. A systematic and generic procedure for the determination of the reasonable finished state of selfanchored suspension bridges is proposed, the realization of which is mainly through adjustment of the hanger tensions.
Selfanchored suspension bridge combining elements of a suspension bridge and a cablestayed bridge. San francisco bay area toll bridge seismic retrofit and. The following 168 files are in this category, out of 168 total. Dynamic analyses of a selfanchored suspension bridge under. The bridge opened to traffic on labor day weekend, 20, and has earned many accolades, often mentioned alongside the golden gate bridge as an iconic structure of the sf bay area. The bridge is a selfanchored suspensioncablestay system with single arch pylon and 3 spans steelconcrete composite girder 72. Deflection theory for selfanchored suspension bridges under live load. The sas is the largest bridge of its kind anywhere in world 2,047 feet, one of many firsts. The final portion of the paper evaluates the potential for selfanchored suspension bridge design, and provides recommendations for design engineers. Therefore, it is of great practical significance to summarize and present some experiences and even lessons for the worldwide community of practicing engineers and researchers. The new east bay span is a selfanchored suspension bridge it has a single tall tower with one cable. A self anchored suspension bridge is a suspension bridge in which the main cables attach to the ends of the deck, rather than to the ground via large anchorages. Bridge erection using suspension structure conversion into a selfanchored bridge structure at completion fig. This 625meter portion of the new bridge includes parallel orthotropic box girders and a single steel tower to support the main cables.
And the schemes of cablestayed suspension bridge have been proposed many times, such as turkey izmit bridge, gibraltar strait bridge, lingdingyang bridge, and so on. A selfanchored suspension bridge is a suspension bridge in which the main cables attach to the ends of the deck, rather than to the ground via large anchorages. San franciscooakland bay selfanchored suspension span. Since 1999, self anchored suspension bridges sasbs have undergone rapid development in china, resulting in remarkable technical progresses in many aspects. The final portion of the paper evaluates the potential for self anchored suspension bridge design, and provides recommendations for design engineers. Selfanchored suspension bridges are increasingly appreciated by engineers for their aesthetic look, low cost and more adaptive for geological environment. Toll bridge seismic retrofit projects seismic safety status. Unlike the externally anchored type, selfanchored suspension bridges may properly be analyzed by the elastic theory, since the effect of distortions of the structural geometry under live load is practically eliminated.
With a main span length of 1,263 feet, sas is the longest, singletower, selfanchored suspension bridge in the world. It was completed and opened to traffic on september 20. In fact, the east span is one of the most costly, complex, and challenging bridge projects in u. Determination of reasonable finished state of self. However, in a rope bridge the deck itself is suspended from the anchored piers and the guardrails are nonstructural. Pdf for selfanchored suspension bridges having the fabrication camber subjected to live loads, a new deflection theory is formulated after an. The original suspension bridge over the tagus river in lisbon, portugal was constructed in 1966. Bridge erection using suspension structure conversion into a self anchored bridge structure at completion fig. The hangers of selfanchored suspension bridge need to be tensioned suitably during construction. In view of this point, a simplified optimization calculation method of cable force for self anchored suspension bridge has been developed based on optimization theories, such as minimum bending energy method, and internal force balanced method, influence matrix method. Toll bridge seismic retrofit and regional measure 1 programs 2012 second quarter.
Dartmouthx the engineering of structures around us recommended for you. The moments and displacements of both the girder and the pylon under live load are acquired. Analysis of selfanchored and groundanchored suspension. For self anchored suspension bridges having the fabrication camber subjected to live loads, a new deflection theory is formulated after an optimized initial state solution is found under dead loads. Department of structural engineering university of. The hangers of self anchored suspension bridge need to be tensioned suitably during construction. The construction of the bridge approach section with twoway sixlane highway, or use the pier for oneself.
Maroney3 abstract the signature span of the new eastern spans of the san francisco oakland bay bridge is an asymmetric self anchored suspension sas bridge. Based on the partition generalized variation principle, considering the compressionbending coupling effect of the main girder and the tower, the large displacement incomplete generalized potential energy functional of threespan self anchored cablestayed suspension. The static behavior of selfanchored cablestayed suspension bridge under vertical load is described with the continuum method. Abstract the new selfanchored suspension span of the east san franciscooakland bay bridge is the main subject of study of this research project. Fabrication and construction of self anchored suspension bridge san francisco oakland bay bridge m. The seismic response of the wusong bridge was analyzed though the response spectrum method and the timehistory method by adopting the midascivil. Deflection theory for selfanchored suspension bridges under.
The original east bay span of the bridge was a cantilever design having two long structural parts lying across a support, with the two arms in balance. Feb 06, 20 analyze and calculates loads of a suspension bridge and comparing to a cable stayed bridge duration. The 1989 loma prieta earthquake made clear the need to improve the safety of the highway system overpasses and bridges. What links here related changes upload file special pages permanent link page. American bridgefluor selfanchored suspension span sas the new east span of the san franciscooakland bay bridge is the worlds longest selfanchored suspension span, 620 metres. Constructing the worlds largest selfanchored suspension bridge. Some suspension bridges are of unusual hybrid types. A selfanchored cablestayed suspension bridge with a main span of 800m is analyzed with linear theory, secondorder theory and nonlinear theory respectively. Living load nonlinearity of self anchored cablestayed suspension bridges is studied in this paper.
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