#TITLE_ALTERNATIVE#

• Main Author: BUDI RACHMAN( NIM : 15010021 ), JONATHAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22709
• Institution: Institut Teknologi Bandung

The high rise building presences become much more popular in big cities all over the world. Space requirements become much higher but limited by region and time which results one stop living concepts in one building. Nowadays, existing buildings are not only the conventional one, but also there are many unique buildings such as twin tower buildings. Different function in the same building required different space requirement for each function which can be accomodated by twin tower building. Mall as one part of one stop living concept needs wider and higher space for giving a spacious impression. Because of that, the mall section in a building has higher interstory height compared to other section. This condition generates soft story mechanism in the building. Indonesia is one of the earthquake-prone country which caused every building in this country should be designed to withstand earthquakes that can happen anytime. Earthquake‘s magnitude and time when earthquake comes can not be predicted, hence, there will be needed to identify the reliability of building structures against the earthquakes load. Earthquakes load and structures resistance capacity are random variable which can be only determined by probabilistic method. Structure resistance capacity toward earthquakes load can be determined using Incremental Dynamic Analysis method with non-linear time history analysis of various kind of earthquake that happened all over the world based on earthquakes record data. Based on this research, structural capacity which is random variable showed in form of fragility function, with PGA average in X-direction is 1,202 and 0,961 in Y-direction also coefficient of variation is 0,818 in X-direction and 0,749 in Y-direction. Using risk integral method or total probability theorem between fragility function of structural capacity and hazard curve based on structure‘s location which is in Jakarta, the result of structure probability of collapse is 1,735% for X-direction dan 1,961% for Y-direction. This probability of collapse calculation results exceed the limit that has been stated in seismic design code of Indonesia. The limit restrict structural design for only one percent probability of collapse in 50 years time period. By investigation, structural failure of this building caused by column element failure at the bottom of the structure in facing the earthquakes load. By analyzing the cause of failure, engineers will need more concern in design process of twin tower building. For example by adding the stiffness of the column element at the bottom of the structure with enlarging the dimension of the element. This solution is expected to make twin tower building becomes more resistance against the earthquakes load.