Effect of torsional stiffness of prestressed concrete box girders and uplift of abutment bearings on seismic performance of bridges |
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| Authors: | Christos P Katsaras Telemachos B Panagiotakos Basil Kolias |
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| Institution: | (1) DENCO – Development & Engineering Consultants S.A., 16 Kifissias Ave, 151 25 Maroussi, Greece |
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| Abstract: | Uplift of certain abutment bearings during earthquake may be utilized as a safety mechanism for the protection of the bridge
against excessive stress. For this reason design codes such as Eurocode 8 permit the uplift of such bearings under certain
conditions. Uplift of an abutment bearing occurs when the torque at the deck end exceeds a critical value. Therefore the torsional
stiffness of the deck, before or after concrete cracking, is an important factor. In this work realistic values for the cracked
torsional stiffness of the bridge deck are estimated from a parametric study of typical thin-walled prestressed box girders,
based on non-linear analysis of softened space truss models proposed in the literature. Moreover the interaction between bearing
uplift and pier flexural response is investigated and recommendations for the seismic design of bridges are proposed, taking
into account the possibility of uplift of abutment bearings before or after yielding of the piers. |
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| Keywords: | Bearings Box-girder Bridge design Prestressed concrete Seismic design Structural analysis Torsional stiffness Uplift |
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