Evaluasi Bangunan Engineering Laboratory Universitas Jambi Menggunakan Teknologi Mikrotremor
DOI:
https://doi.org/10.59563/djtech.v6i2.390Keywords:
Mikrometer, HVSR, FSR, RDM, ResonansiAbstract
Indonesia merupakan wilayah yang memiliki tingkat aktivitas seismik tinggi sehingga evaluasi karakteristik dinamis bangunan menjadi penting untuk mendukung upaya mitigasi risiko gempa bumi. Penelitian ini bertujuan menganalisis karakteristik dinamis Gedung Engineering Laboratory Fakultas Sains dan Teknologi Universitas Jambi menggunakan metode mikrotremor. Akuisisi data dilakukan pada 16 titik pengukuran yang terdiri atas 4 titik tanah dan 12 titik bangunan menggunakan seismograf tiga komponen MAE A6000S dengan durasi perekaman 45 menit pada setiap titik. Data diolah menggunakan perangkat lunak Geopsy melalui analisis Horizontal to Vertical Spectral Ratio (HVSR), Floor Spectral Ratio (FSR), dan Random Decrement Method (RDM) untuk memperoleh frekuensi dominan tanah, frekuensi natural bangunan, rasio redaman, tingkat resonansi, serta indeks kerentanan bangunan. Hasil penelitian menunjukkan bahwa frekuensi dominan tanah berada pada rentang 1,3–2,1 Hz dengan nilai amplifikasi 1,2–1,8 dan indeks kerentanan seismik yang tergolong rendah. Frekuensi natural bangunan berada pada rentang 4,04–5,94 Hz dengan rasio redaman sebesar 4,88–6,11%, yang menunjukkan kemampuan struktur dalam meredam energi getaran masih berada pada kondisi baik. Perbedaan yang cukup besar antara frekuensi dominan tanah dan frekuensi natural bangunan menghasilkan potensi resonansi yang rendah, sedangkan nilai indeks kerentanan bangunan berada jauh di bawah batas aman. Berdasarkan hasil tersebut, Gedung Engineering Laboratory Universitas Jambi memiliki karakteristik dinamis yang baik dengan tingkat kerentanan terhadap pengaruh getaran seismik yang rendah. Penelitian ini menunjukkan bahwa metode mikrotremor merupakan pendekatan non-destruktif yang efektif untuk mengevaluasi kondisi dinamis bangunan dan dapat dimanfaatkan sebagai dasar dalam pemantauan kesehatan struktur serta perencanaan mitigasi risiko gempa pada bangunan bertingkat.
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