Nonsmooth Seismic Response Analysis of a Straight Bridge With Deck Rotation Induced By Abutment Impact


Abstract eng:
The deck-abutment contact (e.g. pounding) during earthquake shaking often triggers the rotation of the deck. Contact at the deck level might alter dramatically the effective mechanical system activating unforeseen, in the design stage, behavior. This discrepancy between the assumed during design seismic behavior, and the actual seismic behavior governed by the nonsmooth planar deck dynamics, can be detrimental leading even to deck unseating/collapse. The impact-induced rotation mechanism is usually encountered in skew bridges, but it is observed also in straight bridges. As a reference, the 2013 experimental shake-table study of a four-span straight bridge by Saiidi et al. [1] showed unexpected large in-plane rotations. This resulted in significant residual displacement of the bents. The present paper simulates the response of that benchmark straight bridge in an attempt to capture the deck-abutment impact and the subsequent in-plane rotation. The study brings forward the (friction-based) physical mechanism behind the rotation of straight bridges which is usually ignored during design and analysis. In this context, it extends a previously established nonsmooth rigid body approach to account for the different excitations at the bottom of the bents and the abutments. The results shed light the role of friction on the impactinduced rotation mechanism, and underline the importance of devising practice-oriented procedures for considering during seismic design the potential in-plane deck rotation of even straight bridges. Finally, the study also investigates the sensitivity of the rotation with respect to the coefficient of friction value.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 796.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)