Effect of seismic retroftting on seismic freagility of low-rise RC commercial buildings in Chiang Mai | |
| Author | Napat Yathipsakul |
| Call Number | AIT Thesis no.ST-24-24 |
| Subject(s) | Buildings--Earthquake effects--Thailand--Chiang Mai Earthquake resistant design |
| 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 purpose of this study is to develop fragility functions for both existing and retrofitted low-rise reinforced concrete (RC) commercial buildings in Chiang Mai, in order to examine the effect of seismic retrofitting on seismic fragility. While Chiang Mai has mostly experienced low- to moderate-level earthquake hazards, historical records show that the region has also suffered from strong earthquakes in the past, implying that more important seismic events may occur in the future.The primary goal of this study is to evaluate the seismic performance of low-rise RC commercial buildings in Chiang Mai and use appropriate seismic retrofit techniques to improve their seismic behavior. Specifically, this study focuses on RC column jacketing as a seismic retrofit strategy. The acceptance criteria for plastic rotation provided by ASCE 41-17 were utilized as a guideline to execute seismic retrofitting on the structures in this study. It was discovered that 2-story low-rise RC commercial buildings require seismic retrofitting to increase their seismic performance. By performing RC column jacketing in the 1st story columns in the front and back rows of the building, the plastic rotation that occurs in the 1st story columns when subjected to ground motion was significantly decreased.Uncoupled modal response history analysis (UMRHA) was used to develop fragility functions for both retrofitted and non-retrofitted low-rise RC commercial structures. Nonlinear response history analysis (NLRHA) is the most precise and accurate method for developing analytical fragility functions, but it involves significant computational work and time. UMRHA requires much less computation time than NLRHA. NLRHA took approximately 3 hours to analyze 60 ground motions, whereas UMRHA took no more than 5 minutes while providing accurate roof displacement results, which can help save time in developing the fragility function, as the fragility function development in this study required analyses to be performed on a large number of ground motions. According to the fragility curves of 2-story RC commercial buildings and retrofitted 2 story RC commercial buildings, the overall vulnerability of commercial buildings after seismic retrofitting was reduced as the probability of exceeding the limit state at each IM level of the retrofitted 2-story RC commercial buildings was lower than that of the non-retrofitted buildings for all limit states. |
| Year | 2024 |
| Type | Special Study Project Report (SSPR) |
| 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) | Anwar, Naveed;Krishna, Chaitanya; |
| Scholarship Donor(s) | Loom Nam Khong Pijai Scholarships |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |