Seismic performance of 2D steel frame structures with lead rubber bearing isolation system | |
| Author | Jayananda, Hewa Thondilege H.L. |
| Call Number | AIT Caps. Proj. no.CIE-17-41 |
| Subject(s) | Earthquake hazard analysis Rubber bearings Structural frames |
| Note | A capstone project report submitted in partial fulllment of the requirements for the degree of Bachelor of Science in Engineering Civil and Infrastructure Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Caps. Proj. ; no. CIE-17-41 |
| Abstract | An earthquake or a seismic activity releases massive amount of energy to the earths surface this energy enters to the structures in the influence areas and sets the structures in motion. This energy needs to be either absorbed by the structural members or dissipated by an additional earthquake resistant design in order to ensure the structural integrity and the safety of people during a seismic activity. Base isolation (BI), also referred to as seismic isolation is one of the most common passive earthquake protective systems, which minimizes the transmission of seismic energy to structures in seismic hazard zones. The objective of this study is to evaluate the behaviors of the ordinary moment frames (OMF) with lead rubber bearing (LRB) seismic isolation system in terms of top storey acceleration, base shear, inter-storey drift and storey acceleration under three benchmark earthquakes, namely, Loma Prieta, Northridge, and San Fernando earthquakes. In this study, the feasibility of LRB base isolation system is tested on 4, 8 and 16 story OMFs by varying two physical properties of isolator which are Bearing Radius and Bearing Height. Modelling of OMFs and analysis are carried in ETABS2015 and Microsoft Excel software. The structural response got improved significantly with the use of LRB system. The parametric study carried out in this study revealed that effect of changing bearing radius is lesser on structural response than the effect of changing bearing height. And also the results showed that lower the bearing radius and higher the bearing radius give best performance. According to the results, the isolator with bearing radius 6.9 in. and bearing height of 19.8 in. showed much improved results than other isolators. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-17-41 |
| Type | Capstone Project |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Civil and Infrastructure Engineering (CIE) |
| Chairperson(s) | Hathairat Maneetes; |
| Examination Committee(s) | Punchet Thammarak ;Tian Boon Soh; |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2017 |