PERFORMANCE COMPARISON OF REGULAR AND VERTICAL IRREGULAR STRUCTURES ON EARTHQUAKE RESISTANT STEEL STRUCTURE

• Main Author: Frisca
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66994
• Institution: Institut Teknologi Bandung

The design of earthquake-resistant structures is very important to be applied in Indonesia, considering that Indonesia is one of the countries that are vulnerable to earthquakes. One of the important aspects that must be considered in the design is the irregularity in the structure which is often unavoidable. The existence of vertical irregularities in the structure affects the performance of the structure, so there are several penalties that must be paid so that the structure still has good performance. Compliance with standards in the design of earthquake-resistant structures generally results in increased development needs and costs, so that violations of applicable standards are often found to minimize costs. This violation is very dangerous and has a negative impact on the performance of the structure, especially on structures with vertical irregularities. In this research, a six-story steel structure is modeled with a special frame moment system. Based on the irregularities, the modeled structures are regular structures, structures with stiffness irregularities, and structures with mass irregularities. Each type of structure is divided into two models, namely structures that uncomplied the standards (Model 1) and structures that complied standards (Model 2). The analysis carried out to determine the performance of the structure is a nonlinear static analysis or pushover analysis. Analysis and comparison of the performance of the structure is reviewed through six parameters, namely the pushover curve, ductility, overstrength, energy dissipation, performance level, and the formation of plastic hinges in the structure. The results obtained prove that the design of the structure by meeting the standards produces a structure with better performance. In addition, the presence of stiffness irregularities and mass irregularities on the 1st floor has a negative impact on the performance of the structure because it produces smaller ductility and overstrength values than regular structures. The impact of this vertical irregularity was found to be more significant in structures with stiffness irregularities than structures with mass irregularities.