In this study, FE-BE direct coupling methods of 1D and 2D problems are considered for the pontoon-type floating structure and the difference of the modeling dimensions is investigated for the hydroelastic response. The modeling dimensions are defined as the 1D problem consisting 1D beam-2D fluid coupling and the 2D problem consisting 2D plate-3D fluid coupling with zero-draft assumption. For case studies, hydroelastic responses of the 1D Problem are compared to those of the 2D Problem for a wide range of aspect ratio and regular waves. It is shown that the effects of the elastic behavior are increased by decreasing the incident wavelength, whereas the effects of the rigid behavior are increased by increasing the incident wavelength. In 2D problem, the incident wave angle can be considered, and slightly more accurate results can be obtained, but the computational efficiency is lower. On the other hand, in 1D problem with plate-strip condition, the incident wave angle cannot be considered, but when the aspect ratio is large, the overall responses can be analyzed through a simplified model, and the computational efficiency can be improved.
Concrete modular-road system has been proposed to accelerate construction speed and consists of columns, cross-beams, upper slabs, and anchor-bolt connections. In this study, the seismic performance of the single modular system is evaluated through a nonlinear time history analysis. The columns and cross-beams are modeled with inelastic frame elements while the upper slab and anchor-bolt connections are modeled with 3D solid element and three directional-nonlinear spring element, respectively. Also, the soil constraint effects around the embedded columns are considered using layered spring elements. The artificial input ground motions are generated for the operational and collapse prevention levels based on the Korean standard design spectrum classified with seismic level I. From the results, all structural components show an elastic behavior for the operational level and do not reaching their ultimate status for the collapse prevention level. It indicates that the modular-road system considered in this study satisfies the two seismic performance levels.
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