| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 106 === In Taiwan, there are many bridges that were destroyed by the nature disasters every year. Although the civil engineers did the best on designing the bridges, the nature disasters would decrease the seismic capacity of the bridges. The survey of the collapsed bridge pointed out that the scoured depths increased by the hydraulic and the seismic capacity decreased.
In this study mainly discusses the structural behavior of the composite structure, ie, the structural behavior of the foundation exposed to erosion and exposed to seismic loads. In the study, the equivalent linear soil springs proposed by previous researchers ,the American Petroleum Institute（API） and Japanese Road Association（JRA） soil spring were used respectively. This study used different soil springs to analyze the vibration behavior of shaking table experiments after bare pile erosion, and compare with the existing single and group pile foundation experiments.
The discussion and comparison of the applicability of the soil springs on exposed structure shows that the response of the experiment can be more effectively simulated by using the equivalent linear spring model. The most important is that the model using equivalent linear spring under near-fault earthquakes completely simulate the behavior of the structure after the shock.
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