Development of seismic fragility functions of RC low-rise single house buildings in Chiang Mai | |
| Author | Herath, Herath Mudiyanselage Nimanthie Manisha |
| Call Number | AIT Thesis no.ST-23-08 |
| Subject(s) | Earthquake hazard analysis--Thailand--Chiang Mai Earthquakes--Risk assessment--Thailand--Chiang Mai |
| 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 | The present study aims to develop fragility functions for low-rise, unreinforced masonry infill wall single houses in Chiang Mai, Thailand. Numerous sources indicate this city is at a high risk of experiencing earthquakes in the future. However, a majority of its buildings lack seismic hazard resistance, leading to substantial seismic vulnerability. The focus of this study is on the smallest building category, single houses, as these structures are often not designed to address seismic risks. Currently, nonlinear dynamic analysis is not frequently employed to develop fragility functions due to its time-consuming nature and heavy computational demands. To address this challenge, a novel methodology is introduced in this study to mitigate the issues associated with nonlinear dynamic analysis. The approach utilized in this study involves uncoupled modal response history analysis (UMRHA) for nonlinear dynamic analysis. For this study, 36 nonlinear time history analyses were conducted in 5 days and 1400 uncoupled modal response analyses were completed within 6 days. As a result, the proposed methodology offers an economical and convenient alternative to nonlinear dynamic analysis, as it reduces time consumption and the complexity of calculations. To construct fragility functions, nonlinear dynamic responses were gathered using multiple stripe analysis (MSA) facilitated by the selection of ground motions through conditional mean spectrum (CMS), and the fitting of fragility functions was carried out using the maximum likelihood approach (MLM). Out of three IMs, peak ground acceleration (PGA), spectral acceleration at fundamental period Sa (T)) and spectral acceleration at 1.5 times fundamental period (Sa (1.5T)), results show that Sa (1.5T)) obtained a considerable maximum likelihood value for each limit and most accurate approximation of the cumulative distribution function (CDF) when comparing it with the already estimated probabilities. Moreover, the newly proposed methodology can be conveniently utilized to generate fragility functions for low-rise buildings in any locations. |
| Year | 2023 |
| 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) | Krishna, Chaitanya;Thanakorn Pheeraphan |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2023 |