Effect of vertical irregularity on the seismic response of a tall building in Philippines | |
| Author | Shakya, Sanisha |
| Call Number | AIT Thesis no.ST-25-20 |
| Subject(s) | Tall buildings--Earthquake effects--Philippines Earthquake resistant design--Philippines Earthquake engineering--Philippines |
| 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 | Tall buildings with vertical irregularities, such as setbacks and soft stories, can suffer more damage during earthquakes. Studies of the effects of vertical irregularities of tall buildings are rarely found in previous studies. The main objectives of this research are to study the effects of the presence of the setbacks and the soft story on global-level and local-level seismic responses. Response Spectrum Analysis, Linear time history analysis (LTHA) and nonlinear response history analysis (NLRHA) are conducted to compare the linear and nonlinear seismic demands. The results show that the setbacks and soft story do not significantly affect the story level responses, but the component-level seismic demands show a slight localized increase in seismic shear and moment demands in shear walls at the higher setback level 41 and significantly decrease at the lower setback level 34 with a clear concentration at the setback interface level whereas for columns there is significant increase in the seismic demand at the setback level 41 but those columns which terminate at the higher level setback i.e. at level 41 the shear demand is increased at setback level 41 and decreased at setback level 34 And for the soft story component-level seismic demands show an abrupt localized increase in seismic shear and moment demands in shear walls at the soft story level and significantly localized decrease in the column at the soft story level with a clear concentration This large and sudden, increasing or decreasing forces can cause serious damage to the structures. The nonlinearity of the structures caused different internal force distributions. The linear analysis may overlook significant concentrated demands at the location of vertical irregularities, especially on the shear walls and columns, resulting in inadequate design and severe damage to the structures. Nonlinear analysis is recommended for the analysis and design of tall buildings with setbacks and soft story, as elastic analysis cannot precisely estimate seismic demands. |
| 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) | Krishna, Chaitanya;Anwar, Naveed (Co-Chariperson) |
| Examination Committee(s) | Pennung Warnitchai;Thanakorn Pheeraphan |
| Scholarship Donor(s) | AIT Scholarship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2025 |