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Seismic performance of single pier skewed bridges with different pier-deck connections

  • Attarchiana, Nahid ;
  • Kalantari, Afshin ;
  • Moghadam, Abdolreza S.
  • Received : 2015.02.14
  • Accepted : 2016.05.23
  • Published : 2016.06.25

Abstract

This research focuses on seismic performance of a class of single pier skewed bridges with three different pier-deck connections; skew angles vary from $0^{\circ}$ to $60^{\circ}$. A well-documented four span continuous deck bridge has been modeled and verified. Seat-type connections with fixed and sliding bearings plus monolithic pier-deck connections are studied. Shear keys are considered either fully operational or ineffective. Seismic performances of the bridges and the structural components are investigated conducting bidirectional nonlinear time history analysis in OpenSees. Several global and intermediate engineering demand parameters (EDP) have been studied. On the basis of results, the values of demand parameters of skewed bridges, such as displacement and rotation of the deck plus plastic deformation and torsional demand of the piers, increase as the skew angle increases. In order to eliminate the deck collapse probability, the threshold skew angle is considered as $30^{\circ}$ in seat-type bridges. For bridges with skew angles greater than $30^{\circ}$, monolithic pier-deck connections should be applied. The functionality of shear keys is critical in preventing large displacements in the bearings. Pinned piers experience considerable ductility demand at the bottom.

Keywords

skewed bridge;pier-deck connection;single pier;nonlinear time history;combined loading;torsion;fixed bearing;sliding bearing;shear key

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Acknowledgement

Supported by : International Institute of Earthquake Engineering and Seismology (IIEES)