Safety Identifying of Integral Abutment Bridges under Seismic and Thermal LoadsReportar como inadecuado




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The Scientific World Journal - Volume 2014 2014, Article ID 757608, 12 pages -

Research ArticleDepartment of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, Iran

Received 2 August 2014; Revised 6 September 2014; Accepted 6 September 2014; Published 27 October 2014

Academic Editor: Siamak Talatahari

Copyright © 2014 Narges Easazadeh Far and Majid Barghian. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Integral abutment bridges IABs have many advantages over conventional bridges in terms of strength and maintenance cost. Due to the integrity of these structures uniform thermal and seismic loads are known important ones on the structure performance. Although all bridge design codes consider temperature and earthquake loads separately in their load combinations for conventional bridges, the thermal load is an “always on” load and, during the occurrence of an earthquake, these two important loads act on bridge simultaneously. Evaluating the safety level of IABs under combination of these loads becomes important. In this paper, the safety of IABs—designed by AASHTO LRFD bridge design code—under combination of thermal and seismic loads is studied. To fulfill this aim, first the target reliability indexes under seismic load have been calculated. Then, these analyses for the same bridge under combination of thermal and seismic loads have been repeated and the obtained reliability indexes are compared with target indexes. It is shown that, for an IAB designed by AASHTO LRFD, the indexes have been reduced under combined effects. So, the target level of safety during its design life is not provided and the code’s load combination should be changed.





Autor: Narges Easazadeh Far and Majid Barghian

Fuente: https://www.hindawi.com/



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