Peningkatan Frekuensi Alami Struktur Dengan Variasi Penempatan Dinding Geser

Sari

Natural frequency of structure is a representation of the flexibility of structure which is a function of stiffness and mass. Natural frequency can be increase by increasing the stiffness or reducing the mass. In this study, the evaluation of natural frequency used three type of reinforced concrete frame structure that is special moment resisting frame, dual system special moment resisting frame combine with core wall and dual system special moment resisting frame combine with frame wall (wall integrated into moment resisting frame). Based on SNI 1726-2012, the 15^th story of appartment fictive building is located at 7046”24’ SL and 110027”7’ EL are classified as Seismic Used Group II , assign an Occupancy Importance Factor (I) of 1.0 and Seismic Design Category D. The response modification coeefficients for special moment resisting frame R = 8.0 and for dual system R = 7, the system overstrength factor for special moment resisting frame W₀=3 and for dual system W₀=2.5, and the deflection amplification factor Cd = 5.5 for all type of structure. The Structural Analysis Program (SAP 2000) used to evaluated natural frequency, displacement, drift story, axial force and moment of column. Result of this study proved that using shear wall as core wall or frame wall increased the natural frequency and stiffness of structure. The placement of shear wall with the same mass as core wall and frame wall give significant influence on natural frequency. The most effective type of structure to increase natural frequency is dual system special moment resisting frame combine with frame wall because wall surface area is larger than core wall.