A Method of Seismic 3-Dimensional Nonlinear Response Evaluation for the Important Soil Foundation Infrastructures Subjected to Large Vertical Motion including Permanent Ground Displacement near Faults

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To establish a method of seismic 3-dimensional nonlinear response evaluation for the important infrastructures subjected to large vertical motion with permanent displacement near fault, (1) a method of the stress strain based response analysis of soil foundation structure system is developed. Also, (2) a theoretical method of simulating near fault ground motion is proposed.The study shows that the most effective device of the response reduction of bridges near faults is the viscous damper although the hysteresis type devices are currently used, because the pulse type motion with large ground displacement near fault cannot generate hysteresis loop of device. The study also reveals that the vertical free support of the bridge girder is effective to reduce the stresses in bridges due to large vertical motion near fault. Finally the study shows that the replacement from the RC bridge slabs to the aluminum slabs is effective to reduce response of the bridges near fault.