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Earthquakes and Structures Volume 9, Number 2, August 2015 , pages 415-430 DOI: https://doi.org/10.12989/eas.2015.9.2.415 |
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Design of integral abutment bridges for combined thermal and seismic loads |
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Narges Easazadeh Far, Shervin Maleki and Majid Barghian
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| Abstract | ||
| Integral abutment bridges have many advantages over bridges with expansion joints in terms of economy and maintenance costs. However, in the design of abutments of integral bridges temperature loads play a crucial role. In addition, seismic loads are readily transferred to the substructure and affect the design of these components significantly. Currently, the European and American bridge design codes consider these two load cases separately in their recommended design load combinations. In this paper, the importance and necessity of combining the thermal and seismic loads is investigated for integral bridges. A 2D finite element combined pile-soil-structure interactive model is used in this evaluation. Nonlinear behavior is assumed for near field soil behind the abutments. The soil around the piles is modeled by nonlinear springs based on p-y curves. The uniform temperature changes occurring at the time of some significant earthquakes around the world are gathered and applied simultaneously with the corresponding earthquake time history ground motions. By comparing the results of these analyses to prescribed AASHTO LRFD load combinations it is observed that pile forces and abutment stresses are affected by this new load combination. This effect is more severe for contraction mode which is caused by negative uniform temperature changes. | ||
| Key Words | ||
| integral bridge; nonlinear model; seismic load; thermal load; soil-structure interaction | ||
| Address | ||
| Narges Easazadeh Far, Majid Barghian: Department of Civil Engineering, Tabriz University, Tabriz, Iran Shervin Maleki: Department of Civil Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran | ||