Comparative seismic analysis of concentric braced steel frames with friction dampers | |
| Author | Alwis, Arthur Dilshan De |
| Call Number | AIT Caps. Proj. no.CIE-14-32 |
| Subject(s) | Steel, Structural Earthquake resistant design Earthquakes and building |
| Note | A project submitted in partial fulfillment of the requirements for the Degree of Bachelor of Civil and infrastructure Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Caps. Proj. ; no. CIE-14-32 |
| Abstract | Many structural systems have been introduced to withstand seismic loading. Two such systems are the Ordinary Concentric Braced Frame and the Friction Damper Braced Frame. This study focuses on the comparison of these two systems in regards to seismic performance for a 5 story (low rise) and 10 story (midrise) steel frames. The story drift, story shear and story accelerations were compared between the Ordinary Concentric Braced Frame and the Friction Damper Braced Frame. Further the OCBF was compared against a VDBF and a VEDBF by Reckerman (2014) and Rifthie (2014) respectively. The baseline Ordinary Concentric Braced Frame was designed by using ASCE 7-10 equivalent static load method. The location was selected as Los Angeles California to obtain earthquake spectral parameters for the equivalent static method. The base structures were then analyzed for three time histories obtained from Pacific Earthquake Engineering Research Database. It was found that ground motion from Loma Prieta earthquake produced the maximum results for the 5 story frame wherein for the 10 story it was Northridge ground motion. After analyzing the Friction Damper incorporated structures for the respective earthquakes that produced maximum results for the baseline structure, it was concluded that for the 5 story and for the 10 story FDBF system is suitable. The average of the story drift ratio, story shear and the story acceleration were considered so that a generalized behavior of the structure can be observed. In comparing the braced systems incorporated with damper systems it was observed for a low rise frame a FDBF was suitable and for a midrise a VDBF, however this observation as mentioned is generalized and was not considered as a definite conclusion. By the process of optimizing the FDBF results maybe varied thereby in order to improve this result the damper system can be optimized under common parameters and a definite conclusion can be obtained. In addition this study can be improved by considering the cost benefit ratio and by incorporating wind analysis along with seismic analysis. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-14-32 |
| 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) |
| Examination Committee(s) | Hathairat Maneetes ;Teraphan Ornthammarath ;Punchet Thammarak; |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2014 |