Evaluasi Kerentanan Jalan Layang Terhadap Aktivitas Gempa Bumi Berdasarkan Analisis Mikrotremor (Studi Kasus : Jalan Layang Djuanda, Kabupaten Sidoarjo)

Pratiwi, Siti Balqis Anggun (2024) Evaluasi Kerentanan Jalan Layang Terhadap Aktivitas Gempa Bumi Berdasarkan Analisis Mikrotremor (Studi Kasus : Jalan Layang Djuanda, Kabupaten Sidoarjo). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kabupaten Sidoarjo rawan terkena dampak gempa bumi berkekuatan besar mencapai M6.5 karena dilewati sesar Waru. Selain itu, Aluvium yang bersifat lunak, lepas, dan belum kompak adalah penyusun sebagian besar Kabupaten Sidoarjo, sehingga mampu memperkuat efek guncangan ketika gempa bumi. Pada November 2022 telah dilakukan pembangunan Jalan Layang Djuanda ruas A (Sidoarjo – Djuanda) dan ruas B (Djuanda – Surabaya) di Kecamatan Gedangan. Oleh karena itu, perlu adanya evaluasi terhadap indeks kerentanan tanah dan jalan layang, resonansi tanah dengan jalan layang, dan faktor kerusakan jalan layang Djuanda menggunakan metode mikrotremor sebagai salah satu upaya mitigasi bencana. Perekaman mikrotremor selama 30 menit tersebar di 51 titik pengukuran, yaitu 28 titik di tanah dan 23 titik di jalan layang. Hasil analisis horizontal to vertical spectral ratio menunjukkan ketebalan sedimen area jalan layang Djuanda lebih dari 30 meter dengan tingkat kerentanan tanah sedang berkisar antara 4.21 – 19.627. Analisis spektrum horizontal dilakukan pada data mikrotremor tanah dan jalan layang untuk mendapatkan frekuensi natural jalan layang Djuanda berdasarkan analisis floor spectral ratio. Indeks kerentanan jalan layang Djuanda ruas A pada komponen N-S berkisar antara 134068 – 809392 dan komponen E-W berkisar antara 111313 – 756276, sedangkan ruas B pada komponen N-S berkisar antara 219091 – 739409 dan komponen E-W berkisar antara 179104 – 999622. Tingkat resonansi jalan layang Djuanda termasuk rendah dengan rata – rata ruas A pada komponen N-S 48.3% dan komponen E-W 47.2%, sedangkan ruas B pada komponen N-S 46.7% dan komponen E-W 46.8%. Begitu pula dengan faktor kerusakan jalan layang Djuanda yang termasuk kategori rendah dengan rata-rata ruas A pada komponen N-S 0.036 dan komponen E-W 0.043, sedangkan ruas B pada komponen N-S 0.115 dan komponen E-W 0.063. Rendahnya tingkat resonansi dan faktor kerusakan menunjukkan jalan layang Djuanda tidak mudah mengalami kerusakan ketika terjadi gempa bumi dan dua parameter tersebut lebih dapat dijadikan acuan dalam penilaian kerentanan struktur jalan layang.
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Sidoarjo is vulnerable to the impact of a massive earthquake reaching M6.5 because it was passed by the Waru Fault. Additionally, the Alluvium which is soft, loose, and unconsolidated covered most of Sidoarjo area's, thus amplifying the shaking effects during an earthquake. In November 2022 the construction of the Djuanda Flyover section A (Sidoarjo – Djuanda) and section B (Djuanda – Surabaya) in Gedangan District was initiated. Hence, it is necessary to evaluate the soil and flyover vulnerability index, soil – structure resonance, and the damage factor of a Djuanda flyover to reduce disaster risk. Microtremors were recorded 30 minutes across 51 points, namely 28 points on the ground and 23 points on the flyover. Horizontal to vertical spectral ratio analysis points out that the sediment layer in Djuanda flyover area increases more than 30 meters with a moderate seismic vulnerability range between 4.21 – 19.627 . Horizontal spectrum analysis was carried out on soil and flyover microtremor data to obtain the natural frequency of the Djuanda flyover based on floor spectral rasio analysis. The vulnerability index of Djuanda Flyover section A on the N-S component ranges from 134068 – 809392 and E-W components ranges from 111313 – 756276, while section B in the N-S components ranges from 21901-739409 and E-W components ranges from 17999622. The resonance level of Djuanda Flyover is low, with an average for section A on the N-S component is 48.3% and E-W component is 47.2%, while segment B on the N-S component is 46.7% and E-W component is 46.8%. Similarly, the damage factor of the Djuanda flyover is low with an average of sectiont A on the N-S component 0.036 and E-W component 0.043, while section B on the N-S component 0.115 and E-W component 0.063. The low resonance level and damage factor indicate that the Djuanda Flyover is not easily damaged during an earthquake, and these two parameter are more reliable references in evaluating the stuctural vulnerability.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Faktor Kerusakan, Floor Spectral Ratio, Horizontal to Vertical Spectral Ratio, Indeks Kerentanan Bangunan, Resonansi
Subjects:	T Technology > TH Building construction > TH1095 Earthquakes and building T Technology > TH Building construction > TH880 Sustainable buildings. Sustainable construction. Green building
Divisions:	Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Siti Balqis Anggun Pratiwi
Date Deposited:	13 Aug 2024 03:10
Last Modified:	13 Aug 2024 03:10
URI:	http://repository.its.ac.id/id/eprint/114831

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