Two suites of ground motion records were compiled to represent the earthquake intensities of interest.
By selecting the representative structural model, the dynamic analysis can be carried out using the appropriate suites of ground motion records.
Existing suites of ground motion time histories were scaled using linear response spectrum scaling for soil conditions using a well-known attenuation relationship.
Three suites of ground motions matching the IEEE 693 required response spectrum were considered, consisting of one suite of three pre-approved empirical and random records and another two suites of records selected based on different criteria.
Seismic performances of the two designs (with the SMABs and the BRBs, respectively) were investigated through nonlinear static analyses and nonlinear response history analyses based on three suites of ground motion records representing different seismic hazard levels.
Through extensive nonlinear time-history analyses conducted using three suites of ground motions, it is demonstrated that demand parameters for skew-abutment bridges, such as deck rotation and column drift ratio, are higher than those for straight bridges.
Results of detailed nonlinear dynamic analyses are then examined for specific cases as well as statistically for several suites of ground motions in order to characterize the effect on key response parameters of various structural configurations and proportions.
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The aim is identification of foundation-soil separation phenomena under a suite of ground motions with distinct frequency content.
