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Effects of Ground Motion Characteristics on Seismic Response of Rocking-Foundation Bridges
Past studies have revealed that the different characteristics of nearfault pulse-like and far-field broadband motions have varying effects on the response of structures. In this paper, a suite of pulse-like and broadband motions are utilized to investigate the response of rocking-foundation and hinging column bridges including large deformation effects. Incremental Dynamic Analyses were carried out on simplified models of which the following parameters were varied: the rocking strength, the column height, and the fundamental period. Results show that, in a probabilistic sense, rocking systems are more susceptible to tip-over in pulse-like motions than in broadband motions. The re-centering effect of rocking systems makes them relatively immune to damage in motions that consist of many small inelastic pulses. Elastic-perfectly plastic hinging systems have less re-centering capability and hence they are more susceptible to accumulated deformation and eventual collapse in many small cycles that might occur in long duration broadband motions.
Effects of Ground Motion Characteristics on Seismic Response of Rocking-Foundation Bridges
Past studies have revealed that the different characteristics of nearfault pulse-like and far-field broadband motions have varying effects on the response of structures. In this paper, a suite of pulse-like and broadband motions are utilized to investigate the response of rocking-foundation and hinging column bridges including large deformation effects. Incremental Dynamic Analyses were carried out on simplified models of which the following parameters were varied: the rocking strength, the column height, and the fundamental period. Results show that, in a probabilistic sense, rocking systems are more susceptible to tip-over in pulse-like motions than in broadband motions. The re-centering effect of rocking systems makes them relatively immune to damage in motions that consist of many small inelastic pulses. Elastic-perfectly plastic hinging systems have less re-centering capability and hence they are more susceptible to accumulated deformation and eventual collapse in many small cycles that might occur in long duration broadband motions.
Effects of Ground Motion Characteristics on Seismic Response of Rocking-Foundation Bridges
Deng, Lijun (author) / Kutter, Bruce L. (author) / Kunnath, Sashi K. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 1750-1759
2012-03-29
Conference paper
Electronic Resource
English
Effects of Ground Motion Characteristics on Seismic Response of Rocking-Foundation Bridges
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