Validasi Model Numerik Viscoelastic Damper untuk Peningkatan Kinerja Seismik Struktur Beton Bertulang
F. H. Rasyid, A. F. Setiawan*, I. S. Irawati
1Departemen Teknik Sipil dan Lingkungan, Universitas Gadjah Mada, Yogyakarta, INDONESIA
*Corresponding author: angga.fajar.s@ugm.ac.id
INTISARI
Penelitian ini bertujuan untuk mengevaluasi efektivitas sistem viscoelastic damper (VED) dalam meningkatkan performa seismik struktur beton bertulang melalui pendekatan numerik berbasis pemodelan nonlinier. Model histeretik Bouc–Wen digunakan untuk merepresentasikan respons VED terhadap pembebanan gempa, dengan mempertimbangkan fenomena degradasi kekakuan dan efek siklik. Berbeda dengan studi sebelumnya yang umumnya menggunakan analisis pushover, penelitian ini mengadopsi skema quasi-static cyclic loading berbasis displacement-controlled untuk menggambarkan respons histeretik secara akurat. Model numerik dibangun dalam dua skala, yaitu skala mikro (tingkat material dan elemen VED) dan makro (struktur rangka dua lantai) dengan konfigurasi elemen twoNodeLink vertikal antar lantai untuk memodelkan VED. Validasi dilakukan dengan membandingkan hasil simulasi numerik terhadap data eksperimen dari Eskandari Nasab et al. (2021). Hasil menunjukkan bahwa model Bouc–Wen mampu menangkap karakteristik nonlinier viskoelastik secara memadai, dibuktikan melalui kesesuaian kurva histeresis gaya-perpindahan dan kapasitas disipasi energi terhadap hasil pengujian. Penelitian ini menunjukkan potensi pendekatan numerik dalam mendukung perancangan dan analisis sistem peredam energi untuk retrofit struktur tahan gempa
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