Enhancing the seismic performance of tall buildings with outrigger systems using viscoelastic coupling dampers | |
| Author | Krishnakumar, Thanirosan |
| Call Number | AIT Thesis no.ST-20-12 |
| Subject(s) | Reinforced concrete construction--Earthquake effects Viscoelastic materials Earthquake hazard analysis Buildings--Earthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-20-12 |
| Abstract | This thesis presents an analytical investigation of the application of Viscoelastic Coupling Dampers (VCDs) in a tall building with two-level outrigger systems (mid and top levels) in a region of high seismicity. A parametric study has been conducted to determine the optimal placement of the dampers in the outrigger levels to achieve enhanced seismic performance of the structure in terms of three engineering demand parameters, which are inter-story drift ratio, floor acceleration, and core wall shear. Linear time history analyses, Fast nonlinear analyses, and Nonlinear time history analyses have been carried out to compare the seismic performance of the tall building, with and without outrigger level VCDs in Service level earthquake (SLE) and Maximum considered earthquake (MCE) hazard levels. The performance of the building was assessed by using several response indicators such as natural periods, mode shapes, base shear, transient drifts, residual drifts, axial strain in the shear wall, and shear force in the shear wall in addition to above three engineering demand parameters. Also, the performance of the dampers in far fault and near-fault earthquakes was studied. Finally, the resilience study in terms of damaged coupling beams was carried out to an extent. Results highlight, the building with VCDs shows improved seismic performance. It was found that VCDs are more effective for far fault earthquakes than near fault earthquakes to suppress seismic responses. From the parametric study, the effectiveness of VCDs at a low level is better than the top level, and effectiveness is also reduced while adding the top-level VCDs with lower levels when considering the number of VCDs. The resilience study shows improvement in resilience in terms of coupling beams with VCDs. |
| Year | 2020 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-20-12 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Punchet Thammarak;Naveed Anwar (Co-Chairperson); |
| Examination Committee(s) | Pennung Warnitchai;Thanakorn Pheeraphan; |
| Scholarship Donor(s) | His Majesty the King’s Scholarship (Thailand); |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2020 |