Study on the Ductility Behavior of Reinforced Concrete Columns with 10 mm Shear Reinforcement Diameter under Variable Axial Loads

Abstract

Memahami perilaku daktilitas kolom beton bertulang sangat penting untuk menjamin keamanan struktur di daerah rawan gempa. Namun, penelitian yang secara khusus mengkaji pengaruh diameter tulangan geser pada berbagai beban aksial masih terbatas. Penelitian ini menganalisis perilaku daktilitas kolom beton bertulang dengan tulangan geser berdiameter 10 mm yang dibebani aksial sebesar 1000 kN, 2500 kN, dan 5000 kN. Pemodelan numerik dilakukan menggunakan perangkat lunak Xtract, dengan dimensi kolom 600 × 600 mm (tanpa confinement) dan 450 × 450 mm (dengan confinement). Parameter utama yang dianalisis meliputi kurvatur awal, kurvatur pada leleh pertama, kurvatur ultimit, dan hubungan momen–kurvatur. Hasil penelitian menunjukkan bahwa peningkatan beban aksial menyebabkan penurunan daktilitas kurvatur, di mana kolom dengan beban 1000 kN menunjukkan daktilitas tertinggi, sedangkan kolom dengan beban 5000 kN menunjukkan daktilitas terendah. Temuan ini menegaskan peran penting tulangan geser dalam meningkatkan daktilitas kolom dan menekankan bahwa desain tulangan yang optimal sangat krusial untuk menjamin ketahanan struktur terhadap kondisi beban yang bervariasi.

Understanding the ductility behavior of reinforced concrete columns is critical for ensuring structural safety in seismic regions, yet there remains limited research on the specific effects of shear reinforcement diameter under varying axial loads. This research investigates the ductility behavior of reinforced concrete columns with a 10 mm shear reinforcement diameter under varying axial loads of 1000 kN, 2500 kN, and 5000 kN. The study aims to understand the effect of shear reinforcement on the ductility of columns and how varying axial loads influence their performance. Numerical modeling was performed using Xtract software, with columns designed to have dimensions of 600 mm x 600 mm (unconfined) and 450 mm x 450 mm (confined). The study focuses on key parameters such as curvature at initial load, curvature at first yield, ultimate curvature, and moment-curvature relationships. The results show that as the axial load increases, the curvature ductility decreases, with the column under 1000 kN demonstrating the highest ductility and the column under 5000 kN showing the lowest. The findings highlight the significant role of shear reinforcement in enhancing the ductility of columns, suggesting that optimal reinforcement design is crucial for ensuring structural resilience under variable loading conditions.