Seismic Vulnerability of Multi-Storey Buildings at UPN ^Veteran^ Yogyakarta using the Floor Spectra Ratio Method Arif Rianto Budi Nugroho (a), Yohana Noradika Maharani (b*), Yody Rizkianto (a), Ikhsan (c), Ariska Rudyanto (c)
a) Geological Engineering Department, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia
b) Environmental Engineering Department, Study Program of Disaster Management, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia
*yohananm[at]upnyk.ac.id
c) Meteorological, Climatological, and Geophysical Agency, Indonesia.
Abstract
Yogyakarta^s location in a plate subduction zone and nearby land faults make it the most active earthquake-prone region in Indonesia from a tectonic perspective. In addition to tectonic reasons, the construction of high-rise buildings, the expansion of public infrastructure, and dense populations all contribute to sensitivity to earthquake disasters. According to historical accounts, structures collapsing and striking individuals or their inhabitants is the primary cause of fatalities during earthquakes. The objective of this study is to assess the seismic vulnerability of multi-story buildings in the UPN Veteran Yogyakarta neighborhood. To do this, floor spectra ratio (FSR) analysis will be used to calculate the building^s dynamic response. Significant spectrum amplification within a given time frame indicates a structure^s susceptibility to resonance. The region of UPN Veteran Yogyakarta has a maximal bedrock acceleration of 0.25 g and is prone to earthquakes. Building vulnerability is determined by the FSR method, which is particularly useful in earthquake-prone areas since it may detect the possibility of vibration amplification from horizontal resonance, a sign of a building^s seismic vulnerability. According to the research findings, the land value is 2.6 Hz and 2.7 Hz, whereas the average natural frequency value of the rectorate building is 3.3 Hz and 3.4 Hz. The average natural frequency of the integrated laboratory building is between 2.5 and 2.7 Hz, while the soil frequency is 2.7 Hz. Consequently, seismic waves passing through the Integrated Laboratory Building may resonate in accordance with ground conditions, while the Rectorate Building may be amplified by them.
