Electronic Theses and Dissertation

Kerusakan balok beton bertulang akibat beban siklik gempa ditandai dengan retak diagonal yang menyebabkan gagal geser secara getas dan menurunkan kinerja struktur. Penelitian ini bertujuan untuk menilai kapasitas beban maksimum, daktilitas, kekakuan awal, dan energi disipasi balok beton bertulang yang mengalami retak geser akibat beban siklik setelah dilakukan perbaikan dengan injeksi pasta semen komposit berbahan dasar tanah diatomae dan perkuatan menggunakan Natural Fiber Reinforced Polymer (NFRP) berbasis serat abaka. Benda uji berjumlah tiga balok berukuran 2250 × 300 × 150 mm, yaitu balok kontrol (SB-01), balok retak diuji kembali tanpa perkuatan (SB-02), dan balok retak yang diperbaiki serta diperkuat dengan NFRP (SB-03). Pengujian dilakukan dengan pembebanan siklik mengacu pada FEMA 461. Hasil penelitian menunjukkan bahwa SB-01 memiliki kapasitas maksimum tekan sebesar 216,60 kN dan kapasitas tarik 190,25 kN dan energi disipasi 643,80 kN.mm. SB-02 mengalami penurunan kapasitas tekan menjadi 201,99 kN dan kapasitas tarik 184,33 kN, sementara energi disipasi 574,87 kN.mm. Balok SB-03 menunjukkan peningkatan kinerja kapasitas, daktilitas, dan energi disipasi tertinggi. Dengan kapasitas tekan 277,72 kN dan kapasitas tarik 196,89 kN dan energi dipasi 1155,42 kN.mm dengan defleksi 17,56 mm. Secara umum, kombinasi injeksi dan NFRP efektif dalam meningkatkan kapasitas defleksi inelastis, daktilitas, dan energi disipasi balok terhadap beban siklik.

Damage to reinforced concrete beams due to cyclic earthquake loads is characterized by diagonal cracks that cause brittle shear failure and reduce structural performance. This study aims to assess the maximum load capacity, ductility, initial stiffness, and dissipation energy of reinforced concrete beams that experience shear cracks due to cyclic loads after repair by injection of composite cement paste made from diatomaceous earth and reinforcement using abaca fiber-based Natural Fiber Reinforced Polymer (NFRP). The test specimens were three beams measuring 2250 × 300 × 150 mm, namely the control beam (SB-01), the cracked beam retested without reinforcement (SB-02), and the cracked beam repaired and reinforced with NFRP (SB-03). The test was carried out with cyclic loading referring to FEMA 461. The results showed that SB-01 had a maximum compressive capacity of 216,60 kN and a tensile capacity of 190,25 kN and a dissipation energy of 643,80 kN.mm. SB-02 experienced a decrease in compressive capacity to 201,99 kN and tensile capacity to 184,33 kN, while dissipation energy was 574,87 kN.mm. The SB-03 beam showed the highest increase in capacity, ductility, and dissipation energy performance. With a compressive capacity of 277,72 kN and a tensile capacity of 196.89 kN and dissipation energy of 1155,42 kN.mm with a deflection of 17,56 mm. In general, the combination of injection and NFRP is effective in increasing the inelastic deflection capacity, ductility, and dissipation energy of the beam against cyclic loads.