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5. Cable-stayed Cable-stayed Bridge B ridge Name: bridge Path: /Examples/LinSta/bridge
Keywords:
linear optimi parest static st atic.. CONSTR: suppor . ELEMEN: beam ANALYS: linear
box class1 class1 l2tru l6ben truss. truss. isotro. OPTION: direct groups units. units. POST: binary LOAD: elemen prestr weight . MATERI: elasti isotro. femv ie. ie. PRE: append . RESULT: displa displa total t otal . ANALYS: linear static. static. CONSTR: suppor . ELEMEN: beam box class1 l2tru l6ben truss. truss. LOAD: elemen force line prestr weight . MATERI: elasti isotro. isotro. units. POST: binary femvie. femvie. RESULT: cauchy displa displa force moment stress OPTION: direct groups units. total .
Figure 5.1: Idealized model This example illustrates some major aspects of the design process of a cable-stayed bridge. We will use a two-dimensional model of such a bridge as shown in Figure 5.1 5.1 (measures (measures in meters). The bridge consists of a deck deck AB, sim sim ply ply su pported pported at th the ends ends and and conn connected by by ten stay cables cables to th the top of a tower tower CD. The tower and the and the deck are not connec connected. ted. The aim of this example is:
Determine the prestress in the stays such that due to the dead weight the tower remains upright and the deck straight horizontal. Determine the influence line for the bending moment M moment M z in the deck at E if if a concentrated traffic load F load F moves along the deck. Determine the stresses in the stay cables and the bending moments in the deck due to the combination of the distributed traffic load q and the permanent load.
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5. Cable-stayed Bridge
Subsections
5.1 Finite Element Model 5.1.1 Geometry Definition 5.1.2 Material and Physical Properties 5.1.3 Supports 5.1.4 Meshing 5.2 Prestress Optimization for Stays 5.2.1 Loading 5.2.2 Linear Static Analysis 5.2.3 Optimization Analysis 5.3 Permanent Load 5.3.1 Check via Linear Static Analysis 5.4 Influence Line for Mobile Force Load 5.4.1 Modifying the Model 5.4.2 Influence Analysis 5.4.3 Drawing the Influence Line 5.5 Combined Loading 5.5.1 Traffic Load 5.5.2 Linear Static Analysis 5.5.3 Deformation 5.5.4 Axial Stresses in Stays 5.5.5 Bending Moments
Next: 5.1 Finite Element Model Up: II. Linear Static Analysis Previous: 4.3.2 Drawing Displacements and Contents Index DIANA-9.4.4 User's Manual - Analysis Examples First ed.
