Seismic risk evaluation of high-rise buildings by : a simplified analysis procedure | |
| Author | Eaindra Myat Min |
| Call Number | AIT Thesis no.ST-24-28 |
| Subject(s) | Tall buildings--Earthquake effects--Evaluation Earthquakes--Safety measures Earthquake engineering--Analysis |
| 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 rapid growth in high-rise building construction in recent decades has raised concerns about their seismic safety and performance. It is essential to assess how these buildings respond during strong earthquakes to ensure the safety of occupants and reduce potential damage. However, evaluating seismic performance is a complex task due to the intricate nature of high-rise buildings, which consist of numerous structural and non-structural elements, each with distinct response behaviors. Furthermore, the dynamic behavior of these buildings during an earthquake is complex, as various vibration modes, beyond just the fundamental mode, frequently play a significant role in the overall seismic response. Moreover, the responses to strong seismic shaking may exceed the elastic limits of the structure, causing damage to various components, further complicating the assessment of seismic safety.In practice, the Non-Linear Response History Analysis (NLRHA) method is often used to assess how high-rise buildings perform during an earthquake. While NLRHA provides accurate results, it is computationally expensive and requires significant time, expertise, and resources, making it impractical for large-scale assessments or routine evaluations. This issue becomes especially apparent when conducting seismic evaluations for a large number of buildings or in the early stages of design, where only limited structural information is available.The goal of this thesis is to check or enhance the accuracy of a simplified method used to evaluate the nonlinear seismic behavior of high-rise buildings with reinforced concrete (RC) shear walls. This method is based on the Uncoupled Modal Response History Analysis (UMRHA) and the Coupled Shear-Flexural Cantilever Beam Model (CSFCBM). It simplifies the calculation process by approximating nonlinear seismic responses for each vibration mode and treating each mode as a nonlinear Single Degree-of-Freedom (SDOF) system. Previous research successfully applied this simplified procedure to four case study buildings, but the procedure had not been verified under conditions where detailed building information is not available.This study builds on the prior work by incorporating two additional case study buildings: a 15-story building, which is smaller than any of the buildings used in previous studies, and a 50-story building, which is taller than the largest building in the prior research. By adding these two case studies, this research aims to test the effectiveness of the simplified procedure under conditions where only limited building information is available, which is often the case in real-world applications. The empirical relationships developed from the previous study, based on four case buildings, were updated and refined by incorporating data from the new buildings, thereby improving the accuracy of the simplified procedure.The results of this study demonstrate that the improved simplified analysis procedure provides reasonably accurate seismic demand estimations for high-rise buildings, even when detailed structural information is unavailable. When compared to the results from the NLRHA procedure, the simplified method showed good agreement, suggesting that it can be a practical and reliable tool for seismic performance evaluation. This improved simplified procedure is particularly useful in scenarios where time, resources, or access to detailed building information are limited.This research also opens up several potential applications for the simplified procedure. It could be employed for large-scale seismic damage and loss assessments of cities or regions in the event of a specific earthquake scenario, where quick and efficient analysis is required for a large number of buildings. Additionally, the procedure can be used to determine earthquake insurance premiums based on risk analysis or to assist in the rapid assessment of various seismic design options during the preliminary design phase of high-rise buildings, where many structural details are still undefined.In conclusion, the findings of this thesis demonstrate the potential of the simplified analysis procedure as a practical and effective tool for evaluating the seismic performance of high-rise buildings, even in situations where detailed structural data is unavailable. This method can be further developed and refined to increase its accuracy and applicability to a wider range of building types, configurations, and materials, offering a promising alternative to traditional, resource-intensive analysis methods. |
| Year | 2024 |
| 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;Anwar, Naveed;Krishna, Chaitanya; |
| Scholarship Donor(s) | Computer and Structures Inc.(CSI), USA;AIT Scholarship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |