Pengaruh Peningkatan Percepatan Gempa Periode Pendek (SS) Terhadap Struktur Bertingkat di Daerah Istimewa Yogyakarta

The magnitude of the earthquake load received by the structure is influenced by the peak acceleration parameters of the bedrock for a period of 0.2 seconds (Ss) and a period of 1 second (S1). This research measures the effect of increasing Ss by 0.1g on 10 and 30 storey building structures in DIY. The parameters measured include frequency, story drift, p-delta influence, stiffness and stability index in 7 sub-districts in DIY using equivalent static earthquake analysis and response spectrum variance analysis. The frequency of 10 and 30 storey buildings in the first 3 modes is less than 1 Hz. This frequency is below the peak acceleration frequency of the DIY earthquake which was measured in the range of 1.25 Hz to 7.14 Hz in the 7 sub-districts studied. The frequency of earthquake vibrations in DIY is more dangerous for low to medium storey buildings or buildings with a period (T) of less than 0.8 seconds. An increase in Ss of 0.1g in a 10-story building resulted in the earthquake force distribution increasing by 3.99% in the x and y directions, story drift increasing by 4.12% in the x and y directions, p-delta increasing by 0.46% in the x and 0.28% in y direction, rigid structure, each floor is a swaying portal. Meanwhile, in a 30-story building, the earthquake force distribution increased by 6.24% in the x and y directions, story drift increased by 6.27% in the x direction and 5.31% in the y direction, p-delta increased by 0.15% in the x direction and 0.55% in y direction, rigid structure, each floor is a swaying portal..