Abstract
This paper investigates the analytical results of the seismic response of multi-span prestressed concrete (PSC) I-girder bridges under seismic loads. To perform numerical analyses, a three-span PSC I-girder bridge with a width of 12 m, a total length of 100 m, and a maximum span length of 40 m was modeled, and a virtual location was selected to consider the soil properties of the area where the bridge was constructed. The seismic load acting on the PSC I-girder bridge was applied in consideration of the soil properties around the pier and the wave passage effect of the bedrock in the artificial seismic load generated, according to the U.S. Nuclear Regulatory Commission (NRC) standard. The analysis results confirmed that the seismic load, with consideration of the soil properties and wave passage effect, generated the maximum response acceleration and bending moment at the deck of the bridge—152% and 232% greater than without considering them, respectively. Therefore, in order to ensure the earthquake resistance of the bridge, the soil properties of the area where the bridge will be built and the wave passage effect of the bedrock must be considered.
Highlights
The Circum-Pacific belt, known as the Ring of Fire, has recently been active, so earthquakes of varying intensity are frequently occurring in various regions around the world
For the frequency of up to five points, the response spectrum generated by the seismic load may have a smaller value than the design response spectrum; (2) When the response spectrum of the seismic load is smaller than the design response spectrum, the value of the response spectrum of the seismic load shall not be less than 10% less than the value of the design response spectrum
U.S Nuclear Regulatory Commission (NRC) standard and the response spectrum calculated by the Seismic Load 1, it was observed that the response spectrum was up to 45.0% larger than the design response spectrum in intervals below 1 Hz
Summary
The Circum-Pacific belt, known as the Ring of Fire, has recently been active, so earthquakes of varying intensity are frequently occurring in various regions around the world. The seismic capacity of infrastructure should be evaluated comprehensively, considering their strength and deformability, and the soil–structure interaction (SSI), which is the mutual interaction between soil (ground) and a structure built on it [4] This is because seismic waves generated from bedrock increase in peak acceleration and change in natural frequency depending on the properties of the soil. The seismic response of PSC I-girder bridges under seismic load, con3s.i1d.eArirntigficthiael SsoeiislmpircoLpoeardties and wave passage effect, were investigated Seismic Load 2: Seismic load generated by SIMQKE; Seismic Load 3: Seismic load generated by SIMQKE, modified to meet U.S NRC standards; Seismic Load 4: Seismic load considering the soil properties of the location where the bridge was installed using DEEPSOIL—a site response analysis program for seismic load modified to satisfy the USNRC
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