| Title |
A Method of Selecting Ground Motions for Three-Dimensional Dynamic Analysis of Structures |
| DOI |
https://doi.org/10.5659/JAIK.2020.36.8.145 |
| Keywords |
Dynamic Analysis; Time History Analysis; Three-Dimensional; Seismic Records; Seismic Design Code |
| Abstract |
Dynamic analyses such as response spectrum analysis or time history analysis of structures have been performed to assess the structural
demands for earthquake loads. For time history analysis, it is very important to select appropriate input ground motions with construction of
numerical models of structures that reflects the non-linearity of the structure. In particular, three-dimensional dynamic analyses are required
for skyscrapers or irregular buildings, according to seismic design codes. Current seismic design codes require that two-dimensional time
history analysis of a structure should be analyzed using three or more horizontal component ground motions. For three-dimensional analysis,
at least three seismic records each consisting of two horizontal components are required. In this study, a method of selecting ground motions
for three-dimensional time history analysis of structures was developed in accordance with the criteria of seismic design code. In the method,
the square roots of sum of squares for selected response spectra are very similar to the shape and size of the design spectrum. Also, the
algorithm is simple, so takes a few seconds for selecting input ground motions. The proposed method is applicable to all target spectra
which has only mean spectrum, such as design spectrum, uniform hazard spectrum or conditional spectrum. |