Parametric study of braced steel frames with viscous fluid dampers | |
| Author | Abeysinghe, Abeysinghe L.T.M. |
| Call Number | AIT Caps. Proj. no.CIE-15-46 |
| Subject(s) | Structural frames--Earthquake effects--Mathematical models 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-15-46 |
| Abstract | Seismic retrofitting using viscous fluid dampers (VFD) is a modern approach which is to dissipate seismic energy. Selection of appropriate VFD properties is important to reduce the response of the structure. This study aims to distinguish a comprehensive relationship between damping coefficients (C) of VFD and response of the structure under the given limitations for concentrically braced frame (CBF) frames of ten story and twenty story thereby to guide future researchers and designers to vary the damping coefficient to fit their requirements. To achieve this first variation of C was done by assigning a constant C for all the stories. It was observed that higher C will give lower displacements, drift ratios, and shears while lower C will give lower accelerations. So an optimum C is high enough to reduce displacement, drift ratio and not too high to prevent the increment of acceleration. Further it was observed that lower stories were dominated by drift and top stories were dominated by acceleration. Based on the response C of top stories was reduced while keeping a higher C for lower stories to reduce displacement and drift ratio. When compared with the performance of CBF with constant C it was observed that assigning a higher C for few low stories and reducing C of top stories will not affect displacement, drift ration and shear significantly. Noticeable reduction of acceleration was observed. Further comparison was done between VFD, fiction damper (FD) and viscoelastic damper (VED). Area of force-deformation hysteresis was kept constant when comparing the performance of the dampers. For ten story CBF it was found that VFD performs better under the selected comparing condition and for twenty story CBF selection out of VFD and FD must be done based on the requirement as VFD has much lower displacements and drifts but slightly high accelerations. If the structure is to be facilitated with acceleration sensitive devices FD is preferred. All the analyses were conducted in ETABS. |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-15-46 |
| 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;Teraphan Ornthammarath;Soh Tian Boon; |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2015 |