03525nas a2200385 a 4500 20260818090706.0 260202s20259999th u ms t 000 eng d .b12474174 AIT Thesis no.ST-25-19 Dhami, Sabita Development of a numerical optimization framework to identify optimal seismic resistant column jacketing configurations in low-rise buildings Pathum Thani, Thailand : Asian Institute of Technology, 2025 81 leaves : ill.+ 1 online resource Thesis ; no. ST-25-19 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering Thesis (M. Eng.) - Asian Institute of Technology, 2025 This study presents a development of a numerical optimization framework for identifying the optimal column-jacketing strategy to enhance the seismic performance of a multi-story reinforced concrete structure.The work is focused on determining both the most effective locations of columns to be retrofitted with reinforced concrete (RC) jackets and the corresponding optimal jacket thicknesses using gradient-based numerical optimization technique. The case-study structure is a two-story building with an irregular arrangement of infilled walls in the ground floor, resulting in a soft-story condition.To improve computational efficiency, optimization is performed on two linear models with infill walls represented as equivalent struts using upper- and lower-bound elastic moduli,capturing both stiff and weak infill conditions.Three ground motions with short, moderate, and long predominant periods are considered. The framework begins with a stepwise optimization where multiple retrofit configurations are tested, followed by simultaneous optimization of column locations and jacket sizes using binary variables with a penalty function. A single retrofit scheme that satisfies constraints for all ground motions and both linear model variants is then selected.To evaluate the realism of linear-model-based optimization results, a nonlinear model is developed using the most effective solution and subjected to nonlinear time-history analysis.Comparing linear and nonlinear responses helps assess whether the linear-based optimum solution reflects true structural behavior.Overall, this study demonstrates a systematic and practical methodology for determining optimal column-jacketing configurations in multi-story buildings, contributing toward more reliable and faster seismic retrofit decision-making. Earthquake resistant design Reinforced concrete construction Columns, Concrete Testing Pennung Warnitchai, Chairperson Krishna, Chaitanya, Examination Committee Anwar, Naveed, Examination Committee Computer and Structures Inc.(CSI), USA, Scholarship Donor AIT Scholarship, Scholarship Donor Asian Institute of Technology. Thesis ; no. ST-25-19 Full-Text http://203.159.5.9/ait-thesis/Viewer/viewer.php?id=B23425 .b12474174 mnarc a 260209 0 260206 m h a 0 mnarc 67 Barcode : - CREATED : 2026-02-02 RECORD # : i13570766 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 28883 28883 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ST-25-19 2026-08-18 09:07:06 1 2026-08-18 67