Effect of V-bracing type on seismic response of multi-storey steel frames with viscous fluid dampers | |
| Author | Balasooriya, Balasooriya M. P. J. |
| Call Number | AIT Caps. Proj. no.CIE-16-26 |
| Subject(s) | Steel frames--Earthquake effects Damping (Mechanics) |
| Note | A capstone project report submitted in partial fulfillment 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-16-26 |
| Abstract | The damage caused by large earthquakes are critical if the structures are not built to resist for earthquakes. The energy released by the earthquakes can be minimized by energy dissipa- tion. One approach of energy dissipation is by using Viscous Fluid Dampers (VFD). These VFDs are added to the structures by using bracing configurations. This study mainly aims on comparing effect of Concentrically Braced Frames (CBF) with and without VFDs, and finding out the most effective bracing configuration among V-Shape, Chevron and Diagonal. This study was conducted for 5, 10 and 20 storey frames under San Fernando, Northridge and Lorna Prieta time histories. ETABS software was used for all the analysing and designing of the frames. Damping coefficient values used by past researches were taken for the initial study and they were arranged uniformly throughout the frames. After the frames were ana- lyzed the damping coefficient value which had the best results was taken for another analysis called Stiffness Proportional Damping (SPD). In this method the total damping value of the whole frame was divided into every storey differently by the storey stiffness to total storey stiffness ratio. Adding VFDs had improved the response of the frames and after the SPD method was conducted it had improved again. When the comparison of the performance of the VDFs in different bracing configurations was done, it was found that chevron bracing configuration had a significant improvement. It had improved the top storey drift of the 5 storey frame for more than 38% and 50% when compared to diagonal and V bracing configu- rations respectively. For the top storey of the 10 storey frame the reductions of the storey drift was 43% and 57% when compared to diagonal and V bracing configurations respectively. The top storey drift reduction of the 20 storey frame of the chevron bracing configuration was 34% and 41 % when compared to diagonal and V bracing configurations respectively |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-16-26 |
| 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, 2016 |