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Earthquake Response of a Three-span bridge, with mid-span supported by pins, to Near-field Pulse and Permanent-displacement Step

Reza S. Jalali, Masoumeh Bahari Jokandan and Mihailo D. Trifunac

Paper No.: 523

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Vol.: 50

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No.: 1

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March, 2013

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pp. 1-27

Abstract

 

Wave passage and differential motions of long structures can lead to excessive demands in the near field of strong earthquakes. For long and stiff structures these demands are dominated by pseudo-static deformations resulting from differential ground motions. In our previous work we confirmed that replacing continuous bridge girder with multiple short segments, interconnected by structural joints, reduces the pseudo-static forces in the piers. In this paper, these reductions are further examined for a three-span bridge with mid-span supported by pins. It is shown that the placement of pins in the mid-span, rather than over the piers, results in only minor differences in the forces and drifts of the bridge. The shear forces in the joint keys, as well as the drifts of piers, for out-of-plane response are again reduced in the high frequency band in the bridge that is made flexible by placement of joints in the middle span.
Keywords: Out-of-Plane Response of a Three-Span Bridge, Spatial Seismic Effects, Ground Rotations, Structural Torsion, Reduction of Shear Forces in Joint Keys, Reduction of Pseudo-Static Actions

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