Effect of using Buckling-Restrained Braces on seismic behavior of tall steel structures with hexagrid system - دانشکده فنی و مهندسی
Effect of using Buckling-Restrained Braces on seismic behavior of tall steel structures with hexagrid system
نوع: Type: Thesis
مقطع: Segment: masters
عنوان: Title: Effect of using Buckling-Restrained Braces on seismic behavior of tall steel structures with hexagrid system
ارائه دهنده: Provider: elaheh yari kamrani
اساتید راهنما: Supervisors: dr. mostafa moghadasi
اساتید مشاور: Advisory Professors:
اساتید ممتحن یا داور: Examining professors or referees: dr. sameti-dr. ketabi
زمان و تاریخ ارائه: Time and date of presentation: 2025
مکان ارائه: Place of presentation: 43
چکیده: Abstract: As the global population grows and urbanization expands, the demand for larger and taller buildings has increased. To address the challenges posed by lateral loads such as wind and earthquakes, various structural systems have been developed. One such system is the hexagonal truss system, initially proposed by MashhadiAli and Kheyroddin in 2012. This innovative system eliminates the need for external vertical columns in tall buildings, offering panoramic views and a more aesthetically pleasing design. The hexagonal truss system combines the advantages of hollow tubes and trusses, providing an optimal and adaptable solution. on the other hand, Buckling-restrained braces (BRBs) are known for their seismic resistance. This research investigates the impact of BRBs on the seismic performance of tall buildings with hexagonal truss systems. Specifically, it aims to determine whether adding BRBs to such structures can enhance their seismic performance.To conduct this research, computer modeling and both linear and nonlinear analyses were employed. Twenty-four building models with hexagonal truss systems were designed in three different heights (24, 30, and 36 stories) and two configurations (vertical and horizontal). Six models were designed without BRBs, while 18 models incorporated various BRB arrangements. These buildings were modeled using ETABS software, and then subjected to linear dynamic and nonlinear time history analyses under seismic loads. The results of this research indicate that adding BRBs to tall buildings with hexagonal truss systems generally does not improve seismic performance. In fact, it can even lead to increased lateral displacement and inter-story drift. Based on these findings, it can be concluded that relying solely on BRBs to enhance the seismic capacity of all structures is not a reliable approach. In many cases, BRBs not only fail to improve seismic performance but can also increase structural vulnerability.