Seismic performance assessment of a high-rise building subjected to repeated earthquakes | |
| Author | Rajbhandari, Merit |
| Call Number | AIT Thesis no.ST-20-10 |
| Subject(s) | 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-20-10 |
| Abstract | Earthquakes occur as a cluster of multiple ground shakings originating from a single fault or multiple faults in close proximity. Multiple ground shakings are especially significant for reinforced concrete structures. Under the effect of a large mainshock, reinforced concrete structures may experience significant degradation of strength and stiffness. The seismic performance of structures with initial damage under subsequent ground shakings is not well understood. Extensive studies have been conducted in analyzing the effect of multiple ground shakings; from single degree systems without degradation to full non-linear fiber models. But there is limited study on the seismic behavior of tall buildings under repeated ground motions. Also, there are some in consistencies with the results from different researchers. This may be due to the fact that the buildings used for the analysis have not been designed for the ground motions they are subjected to. Hence, the building may be over-designed or under-designed which will affect the results. Also, different researches have used different approach to select and scale the ground motions. To try and tackle these issues, this study has utilized Incremental Dynamic Analysis (IDA) to assess the seismic performance. By using IDA, there is no need to scale the ground motions as the scale factor will be gradually varied and also the capacity of building will be clear from the IDA results which will ensure that the building was appropriately designed. For this purpose, two ground motions are applied one after another; the first ground motion will introduce initial damage to the building and performance of the building under second ground motion will be monitored. From this study, it was found that the intensity of first ground motion has significant impact on the response under second ground motion. Specifically, ground motion that cause less than 2% maximum inter-story drift ratio have almost no effect. Increasing the intensity of first ground motion consistently worsens the response under second ground motion; the base shear is saturated at lower values and analytical failure is caused by smaller intensity ground motions. |
| Year | 2020 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-20-10 |
| 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;Anwar, Naveed (Co-Chairperson); |
| Examination Committee(s) | Thanakorn Pheeraphan;Pennung Warnitchai; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2020 |