Effects of outrigger & belt truss system on high-rise building structure performance

Abstract

Using the lateral stiffener system, outrigger & belt truss is one of alternative to reduce the period of fundamental vibrate, displacement, and inter-story drift on high-rise building due to earthquake. The method that used to analysis structure performance, either it used an outrigger & belt truss system or not in post-elastic seismic load condition is nonlinear static analysis with pushover. The result of pushover analysis which shown the performance of building structure when an earthquake occurs, known as performnace based design. This research use 4 models building (A-BC-D) with 62 floors of tower and 6 floors of podium, has dual system portal combination with particular concrete shear-wall and located in the City of Jakarta which soft soil categorize. Building A doesn't has outrigger & belt truss, meanwhile building B has it and the material of both buildings are reinforcement concrete structure. Building C doesn't has outrigger & belt truss, meanwhile building D has it and the material of both buildings are profile steel structure. Seismic load design based on Source Map and Indonesian Earthquake Danger 2017 in analysis was determine as seismic repeat load which has possibility to become bigger during age of building structure (50 years), 2 %. Building A and B has Immediately Occupancy performance level, building C is Damage Control and building D has Immediately Occupancy performance.