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Lucky Suryajaya, Lingga Ekaputra
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Civil Engineering, Building, Construction & Architecture Computer Science & IT

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Evaluasi Spektrum Respons Amplifikasi Gerak Tanah Gempa Studi Kasus Kampus Universitas Indonesia, Depok Lucky Suryajaya, Lingga Ekaputra; Prakoso, Widjojo Adi
Prosiding Semnastek PROSIDING SEMNASTEK 2024
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Penelitian evaluasi spektrum respons amplifikasi gerak tanah gempa dilakukan di HutanUI, Depok. Penelitian ini merupakan tindak lanjut dari studi sebelumya yang mempelajariamplifikasi gerak tanah gempa dari kedalaman 300 meter hingga permukaan tanah.Evaluasi dilakukan secara satu dimensi (1D) menggunakan perangkat lunak DEEPSOILv7dengan metode studi parametrik terhadap aspek kekakuan tanah dan ketelitian pemodelan,yaitu: ekstrapolasi linear N-SPT, penyesuaian vs dari kedalalman 80 meter – 300 meter,penyesuaian vs dari permukaan tanah, penyesuaian model konstitutif tanah, danpenyesuaian fmax. Dari evaluasi yang dilakukan, diperoleh best model spektrum responsyang paling mendekati hasil rekaman di lapangan adalah dengan mengekstrapolasi N-SPT,menggunakan nilai vs sebesar 2.000 m/s dari kedalaman 80 meter – 300 meter,penyesuaian vs dikalikan dengan 1,5 dari permukaan tanah hingga lapisan ke-6 atau 23,5meter, serta menggunakan nilai fmax tertinggi, yaitu 300 Hz. Dari penelitian ini, diketahuipula bahwa studi sebelumya memodelkan tanah secara lebih lunak dan pengaturan fmaxsebesar 30 Hz dianggap masih kurang teliti.Kata kunci: amplifikasi, kekakuan tanah, spektrum respons, studi parametrik
Studi Awal Amplifikasi Gerak Tanah Gempa untuk Universitas Indonesia (Depok) Lucky Suryajaya, Lingga Ekaputra; Prakoso, Widjojo Adi; Basarah, Yuamar Imarrazan; Pramono, Sigit
Jurnal Teknik Sipil Vol 31 No 2 (2024): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.2.4

Abstract

Abstract This research is motivated by the frequent occurrence of earthquakes in Indonesia in recent years. Meanwhile, the common practice in determining soil and seismic parameters in Indonesia still heavily relies on various empirical studies. Therefore, this study aims to investigate soil and seismic parameters in Indonesia through the phenomenon of earthquake ground motion amplification, with a case study located at the University of Indonesia (Depok). The research methods employed include the analysis of earthquake recording data in the UI Forest at a depth of 300 meters, one-dimensional modeling using DEEPSOIL v7 software, and a comparative analysis of the ground motion recording results of the earthquake in Banten on January 14th, 2022, with a magnitude of 6.6 (low strain) on the surface of UI Forest and FMIPA UI. The research results show visible oscillations at the end of the ground acceleration output and a spike in the peak ground acceleration (PGA) value at around 30 meters in the uppermost layer, with periods and spectral acceleration higher than the expected recorded values. This indicates that the soil modeled based on correlation is softer than anticipated. In other words, the soil is stiffer than previously assumed based on the established correlations.
Co-Authors Prakoso, Widjojo Adi Sigit Pramono Yuamar Imarrazan Basarah