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Structural Engineering and Mechanics
  Volume 59, Number 5, September10 2016 , pages 803-820

Evaluation of a DDB design method for bridges isolated with triple pendulum bearings
Gholamreza Ghodrati Amiri, Mahdi Mohammadian Shalmaee and Pejman Namiranian

    In this study a direct displacement-based design (DDBD) procedure for a continuous deck bridge isolated with triple friction pendulum bearings (TFPB) has been proposed and the seismic demands of the bridge such as isolator\'s displacement and drift of piers obtained from this procedure evaluated under two-directional near-field ground motions. The structural model used here are continuous, three-span, castin-place concrete box girder bridge with a 30-degree skew which are isolated with 9 different TFPBs. By comparing the results of DDBD method with those of nonlinear time history analysis (NTHA), it can be concluded that the proposed procedure is able to predict seismic demands of similar isolated bridges with acceptable accuracy. Results of NTHA shows that dispersion of peak resultant responses for a group of ground motions increases by increasing their average value of responses. It needs to be noted that the demands parameters calculated by the DDBD procedure are almost overestimated for stiffer soil condition, but there is some underestimation in results of this method for softer soil condition.
Key Words
    direct displacement-based design; triple friction pendulum bearing; seismic isolation; bridge; near field ground motion
Gholamreza Ghodrati Amiri: Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
Mahdi Mohammadian Shalmaee: Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
Pejman Namiranian: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

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