Precise construction and management needed due to changes in the structural system by each construction stage. For instance, bridge over rail road, bridge over the sea.Ĭonstruction management is complicated due to having measurements of each stageįSM Low cost of equipment, simple method of construction Cost effective for level ground and low bridges Fast construction, stable supports during constructionįCM Little effect of supporting conditions Possible for constructing long suspension bridge without heavy duty equipment Accuracy of the construction can be enhanced by the correction of errors at each construction stage. Lower pier is more Easy to construct cost-effective Cost-effective if higher pier or if there is limited space underneath the bridge. methodĮconomical efficiency is Construction is fast due to There are plenty of international determined by the height of the the lumped pouring method.
Slow construction due to Less restrictions by the bottom forward construction stage condition. Restrictions by the bottom conditions are crucial, depending on the supporting system. Construction Methods 1) Construction method of EXTRADOSED PSC BOX GIRDER BridgeĬharacteristics of the Construction Method Name Optimum Design of Bridge Cable arrangement: FAN arrangement (one sided) Number of Cables: 7 lines (0.6”-29EA) Height of the Main Tower: H=12.0m (L/8.75) Section: Uniformed Section 2.5m(L/40)ī.
Modeling Initial Cable Forces Construction Stage Analysis Nonlinear Effects Results Longer spans possible with the use of cables =>H/L of extradosed bridges: 1/15 to 1/35 =>H/L of box girder bridges: 1/15 to 1/17 Lower main tower =>H/L of extradosed bridges: 1/15 =>H/L of cable stayed bridges: 1/5 =>Smaller stress variation in stay cables =>Reduced fatigue failure of stay cables =>Construction & appearance: Cable Stayed Bridge =>Structural properties & design specifications: PSC girder bridge Reduced girder depth =>Reduced self weight of the structure Cable Forces and StressesĬase Study Modeling Initial Cable Forces Construction Stage Analysis Nonlinear Effects Resultsīenefits with Extradosed Bridge Ordinary prestressed girder bridge with internal or external tendons having cables installed outside and above the main girder and deviated by short towers located at supports. Camber Computation 1) Construction Camber 2) Manufacture Camber c. Forward CS Analysis 1) Using Backward CS Analysis results 2) Using Lack of fit force 3) Using Unknown load factor VI.
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