Report - PEER - University of California, Berkeley

Figure 2—continued. (c) floor displacements, (d) story drift ratios, (e) plastichinge rotations, (f) floor accelerations, (g) intensity/demand curves.3.2 Pushover Analysis of a Long Viaduct in Transverse DirectionThe second example is a 14 span, 789 m long Sadabad – No.1 Viaduct in Istanbul,constructed in late 1980’s using incremental launching method with regular spans andside spans of 58 m and 46.4 m, respectively (Fig. 3a). Piers are of reinforced concretebox sections with plan dimensions of 3m x 4.7 m and a wall thickness of 0.45 m. Pierheights measured from top of the foundation to the soffit of the deck vary between 9m and 48 m. Prestressed concrete deck is a 5 m deep box girder with a 12.3 m wideroadway slab (Fig. 3b). Plastic behavior is represented by plastic hinges located atpier bottoms. 8 vibration modes are considered in IRSA for transverse pushoveranalysis using the same smoothed response spectrum as above. Fig. 3c shows modalcapacity diagrams and implementation of equal displacement rule at the onset of firstyield and at the peak response. Given in Fig. 3d, 3e,3f are the transverse deckdisplacements, pier drift ratios and plastic hinge rotations, respectively, where thesame response quantities obtained from a single-mode IRSA are superimposed forcomparison.354