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All Journal EKSAKTA: Journal of Sciences and Data Analysis Jurnal Mahasiswa Jurusan Teknik Sipil
Raihan Baihaqi
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Materials Science & Nanotechnology

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Analisis Kinerja Seismik Bangunan X Menggunakan Metode Pushover Dengan Penambahan Shear Wall Raihan Baihaqi; Ari Wibowo; Retno Anggraini
Jurnal Mahasiswa Jurusan Teknik Sipil Vol. 1 No. 3 (2026): Student Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Brawijaya

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Abstract

Indonesia yang berada di kawasan tektonik aktif menuntut struktur gedung tinggi, seperti Gedung X (12 lantai), untuk memiliki sistem penahan gaya lateral yang andal guna mengontrol kerusakan bangunan. Analisis struktur linear-elastis konvensional memiliki keterbatasan karena tidak mampu memprediksi urutan terjadinya pelelehan elemen secara akurat saat gempa kuat terjadi. Penggunaan Sistem Rangka Pemikul Momen (SRPM) secara tunggal (Bare Model) sangat rentan terhadap simpangan antar tingkat yang ekstrem dan ketidakstabilan global akibat efek P-Delta. Penelitian ini dilakukan untuk mengevaluasi kinerja seismik Bare Model dengan membandingkan enam variasi penempatan dinding geser (shear wall), serta menentukan efektivitasnya terhadap kapasitas geser dasar, kekakuan lateral, dan mekanisme sendi plastis berdasarkan kriteria ATC-40. Pemodelan dan analisis dilakukan menggunakan metode Pushover berbantuan perangkat lunak ETABS. Hasil penelitian menunjukkan bahwa struktur eksisting (Bare Model) tertahan pada level kinerja Damage Control (DC) dengan target perpindahan 599,09 mm pada arah Y. Dari keenam modifikasi, Variasi 2 (kombinasi sisi luar dan interior sumbu Y) ditetapkan sebagai konfigurasi paling optimal. Variasi 2 mampu meningkatkan level kinerja bangunan menjadi Immediate Occupancy (IO), meningkatkan gaya geser dasar hingga 32.980,93 kN (arah Y), dan mereduksi simpangan maksimal menjadi 68,86 mm. Rasio torsinya stabil pada angka 1,132 (memenuhi batas aman < 1,2). Distribusi sendi plastis pada model ini menunjukkan tercapainya mekanisme daktail Strong Column-Weak Beam, tanpa mengganggu fungsionalitas ruang arsitektural gedung. Kata kunci: kinerja seismik, pushover, shear wall, ATC-40, sendi plastis, performance level.
Phytochemical Screening and Antioxidant Activity of the Ethanol Extract of Api-Api Fruit (Avicennia marina) Using the DPPH Method Dwiki Ramanda, Galih; Is Fatimah; Anggraini Putri Utami; Nur Jati Jagad; Nunung Nurlaela; Septiana Intan Permata; Zakiyya Hamidah; Raihan Baihaqi; Zeeshan Ahmad
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 7, ISSUE 2, October 2026
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol7.iss2.art3

Abstract

Avicennia marina is a mangrove species with potential as a natural source of bioactive compounds; however, the utilization of its fruit as a source of antioxidants remains relatively limited. This study aimed to identify the phytochemical profile and evaluate the antioxidant activity of the ethanolic extract of A. marina fruit using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. A. marina fruits collected from a mangrove area in West Kalimantan, Indonesia, were extracted using ethanol. The phytochemical profile was determined through qualitative screening and functional groups were characterized using Fourier-transform infrared (FTIR) spectroscopy, while antioxidant activity was evaluated spectrophotometrically using UV–Vis spectroscopy, with vitamin C as the positive control. Phytochemical screening revealed the presence of flavonoids, saponins, terpenoids, and tannins, whereas alkaloids were not detected. FTIR analysis showed major absorption bands at 3285.33, 2924.89, 1623.20, 1268.28, and 1028.60 cm⁻¹, indicating the presence of O–H, aliphatic C–H, aromatic/conjugated C=C, and C–O functional groups. The DPPH assay at a maximum wavelength of 517 nm showed that the extract at concentrations of 10–50 ppm exhibited radical scavenging activities of 13.75–76.95%, while vitamin C at 1–5 ppm exhibited 22.38–95.40%. Linear regression equations were y = 1.5692x − 2.7204 (R² = 0.9961) for the extract and y = 18.504x + 4.2081 (R² = 0.9985) for vitamin C, yielding IC₅₀ values of 33.60 and 2.47 ppm, respectively. These findings demonstrate that the ethanolic extract of A. marina fruit possesses DPPH radical-scavenging activity, although lower than that of vitamin C, indicating its potential as a natural source of antioxidant compounds for further development.
Co-Authors Anggraini Putri Utami Ari Wibowo Dwiki Ramanda, Galih Is Fatimah Nunung Nurlaela Nur Jati Jagad Retno Anggraini Septiana Intan Permata Zakiyya Hamidah Zeeshan Ahmad