#TITLE_ALTERNATIVE#

• Main Author: WARGANEGARA ( NIM : 15010012 ), IRVANDI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22627
• Institution: Institut Teknologi Bandung

Buckling Restrained Braced Frames (BRBF) presents as the development of Concentrically Braced Frames (CBF) which have a buckling problems on its bracing element. As a result of the buckling problems, CBF have poor ductility. The presence of bracing system that have a buckling restrained performance without excessive magnification from the cross-sectional area of bracing elements cause changes in behavior of the structure. The buckling restrained braces, which have the same capacity for compression and tension, plays an important role in the inelastic behavior of the structure when the earthquake load burdened the structure back and foth. The paper will study the performance of a steel structure with buckling restrained braces for high building with different configurations of bracing elements. The structure to be analyzed is a 25-story steel structure with dual system that is BRBF plus Moment Resisting Frames (MRF). The bracing configurations that will be studied is the single diagonal configuration and inverted-v configuration. The used of steel profile are planned will be same for both models on the MRF and BRBF in order to know the difference of structural performance caused by the used of different bracing configurations. The performance that will be analyzed includes the maximum drift that occur in the structure, the structural damage when receive the earthquake load, and the formation of plastic hinge on the structure in inelastic state. The study will use non linear pushover analysis and non linear time history analysis. Based on the analysis, the structure with inverted-v bracing configurations provides greater stiffness to the braced frames compared to the single diagonal bracing configurations, which has implications to increase the overall structure’s stiffness. With different stiffness, both configurations produce the same performance level for braced frames but different for moment resisting frames. The drift on structure with single diagonal configurations is larger than inverted v configuration for both elastic and inelastic state. The formation of plastic hinge in inelastic state occurs as planned. In the inverted-v bracing configurations, the beam on braced frames begin to yield when the BRB has already passed its maximum capacity, but it does not occur in a single diagonal bracing configurations. The implication of greater stiffness from inverted-v bracing configurations is greater force in the beam and column of braced frames when an earthquake load burdened the structure. The inverted-v bracing configurations produce less structural damage to element beside BRB than single diagonal bracing configurations because the dissipation of energy on bracing is more effective on inverted-v bracing configurations