Effects of podium in the seismic response of tall buildings | |
| Author | Manandhar, Sichu |
| Call Number | AIT Thesis no.ST-25-16 |
| Subject(s) | Tall buildings--Earthquake effects Structural engineering |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This study examines how seismic forces is distributed in a tall podium building and how these forces are shared among their structural components. A nonlinear time-history analysis was performed on a representative building to observe the detailed force flow during earthquake shaking. The results show that the podium level plays a major role in changing how forces move from the podium into the tower. Although the overall building response, such as total base shear, story drifts, and wall forces, remains within normal ranges, the internal forces in individual tower columns behave very differently. Several columns experience much higher shear forces than expected, showing that forces can concentrate locally even when the global response appears moderate.A key observation is the clear occurrence of shear reversal in several tower columns. This reversal happens when the direction moment gradient temporarily changes during strong shaking. Each time this occurs, the affected columns also show a special moment pattern, with a clear abrupt change in moment gradient observed at the podium level. The study also finds that there is force redistribution of forces within the tower frames itself. At certain time instants, when some columns experience peak negative shear, other columns show high positive shear, cancelling each other out when observing the structure as a whole. Overall, the findings show that podium-tower interaction can create high and unexpected demands on certain columns, even when global responses suggest the building is performing well. This highlights the importance of evaluating element-level responses carefully when designing the seismic system of tall podium buildings. |
| Year | 2025 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai |
| Examination Committee(s) | Thanakorn Pheeraphan;Krishna, Chaitanya |
| Scholarship Donor(s) | AIT Scholarship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2025 |