Analysis of Building Response from Vertical Ground Motions
Building structures are subjected to both horizontal and vertical ground motions during earthquakes, but only the horizontal ground motion has been extensively studied and considered in design. Most of the prevailing seismic codes assume the vertical component to be 1/2 to 2/3 of the horizontal one. In order to understand the building responses from vertical ground motions, many earthquakes records are studied in this paper. System identification methods (ARX Model) are used to analyze the strong motions and to find out the characteristics of the vertical amplification factors and the natural frequencies of buildings. Analysis results show that the vertical amplification factors for high-rise buildings and low-rise building are 1.78 and 2.52 respectively, and the average vertical amplification factor of all buildings is about 2. The relationship between the vertical natural frequency and building height was regressed to a suggested formula in this study. The result points out an important message; the taller the building is, the greater chance of resonance of vertical vibration on the building will be.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131976Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF
 Taiwan Construction and Planning Agency, Seismic Design Specifications and Commentary of Buildings, 2011.
 Elnasha, A. S. and Papazoglou A. J., Analytical and field evidence of the damaging effect of vertical earthquake ground motion, Earthquake Engineering & Structural Dynamics, 25(10), 1109-1137, 1996.
 Elnashai, A. S. and Papazoglou A. J., “Procedure and spectra for analysis of RC structures subjected to strong vertical earthquake loads”, Journal of Earthquake Engineering, 1(1), 121-155, 1997.
 Eiji, S., Sachi, F., Atsuo, K., and Masayoshi, N., Full-scale shaking table for examination of safety and functionality of base-isolated medical facilities, Earthquake Engineering & Structures Dynamics, 40(13), 1435-1453, 2011.
 Kuo, Fung-Wen, “Vertical Earthquake Response Analysis of General and Base-isolated Buildings”, National Cheng Kung University Department of Architecture, Taiwan, 2013.
 Chang, Yu-Shan, “Vertical Buildings Response Characteristics from Earthquake Ground Motion Analysis”, Master thesis, National Cheng Kung University, Department of Architecture, 2015.
 Tu, Chao-Yu, “A Study on Vertical Floor Amplification Factor and Resonant Amplification Factor of General Buildings”, Master thesis, National Cheng Kung University Department of Architecture, Taiwan, 2015.