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Journal: International Journal of Civil Engineering and Technology (IJCIET) (Vol.8, No. 4)

Publication Date:

Authors : ;

Page : 550-558

Keywords : Pushover Analysis; Forced Based Design; Displacement Based Design; Seismic Demand; Bridge Performance.;

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Al-Najibiya bridge was designed to be constructed in the north of Basrah province to connect Garmat Ali sub-district to Basrah city crossing Euphrates branch near it's connection with Tigris to form Shat Al Arab river. The bridge consists of 7 spans with a movable (turn over) part for navigation allowance with a total length of 250m. and a width of 16m. The bridge was designed using a forced based design method (FBDM) according to AASHTO 2011[1] specifications. During the implementation of the piles of the bents, technical difficulties faced the contractor due to the high amount of steel reinforcements which required a solution. The bridge owner decides to review the design and reduce the amount of longitudinal rebars in the piles by an amount of 35% with no change to the section dimension. This change eased the implementation but as it believed that most of the reinforcement required by the seismic demands, a more advanced seismic analysis is required to check the performance of the bridge due to the design extreme earthquake. A pushover analysis of the bridge piers is performed to evaluate their capacity compared to their seismic demand. Results reveal acceptable performance of the bridge piers under the extreme design earthquake.

Last modified: 2017-10-09 20:38:56