Analisis Daktilitas dan Mekanisme Kegagalan Sambungan Balok-Kolom Pracetak Dengan Perkuatan Kombinasi Pelat BAJA-CFRP
DOI:
https://doi.org/10.31328/bouwplank.v6i2.1026Keywords:
CFRP, Daktilitas, Pelat Baja, Retrofit, Sambungan Balok-Kolom PracetakAbstract
Sambungan balok-kolom pracetak tipe kering rentan mengalami kegagalan getas dan kehilangan daktilitas pada beban siklik, sehingga membutuhkan perkuatan yang efektif. Penelitian ini mengevaluasi retrofit kombinasi pelat baja eksternal, angkur, dan Carbon Fiber Reinforced Polymer (CFRP) Sheet pada sambungan yang sebelumnya telah dibebani hingga rusak. Pengujian pembebanan quasi-siklik dilakukan pada benda uji eksisting dan retrofit dengan dua variasi pengangkuran, yaitu dua angkur (CP2) dan empat angkur (CP4). Daktilitas perpindahan (μΔ) dihitung dengan pendekatan secant dan tangensial. Retrofit memulihkan kapasitas beban lateral dan meningkatkan daktilitas dibandingkan kondisi eksisting. CP4 memberikan kapasitas beban tertinggi (Pmaks 17,72 kN dibandingkan 15,58 kN pada CP2), sedangkan CP2 memiliki μΔ lebih tinggi pada acuan Pmaks, baik secant (2,98 dibandingkan 2,71) maupun tangensial (9,53 dibandingkan 7,10). Peningkatan daktilitas secant terhadap kondisi eksisting mencapai 156,26% (CP2) dan 80,10% (CP4). Simpangan ultimit (Δu) diambil sebesar 45 mm karena pengujian dihentikan akibat gap pada sambungan, debonding, dan angkur mulai kendor sebelum beban turun 20% dari Pmaks, sehingga μΔ merupakan batas bawah. Perkuatan ini meningkatkan daktilitas sambungan pracetak, namun perbedaan antar-konfigurasi masih bersifat indikatif karena hanya satu benda uji per variasi.
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