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Analysis and seismic retrofitting of unreinforced masonry building: a case study
Unreinforced masonry structure (URM) consists of a major portion of existing structures in under-developed and developing countries all over the world. Most of these URM structures are non-engineered which usually do not conform to local building codes and would be considered significantly deficient to international standards. So, seismic vulnerability assessment of these URM structures is of major significance. The present paper addresses this issue with a systematic approach to assess and analyze the structural vulnerability of a non-engineered URM building. Consequently, a complete retrofitting design procedure is discussed followed by construction and field implementation. Initially, a detailed engineering assessment of the whole structure was carried out which included site investigation, rigorous laboratory and in-situ tests, and development of a 3D finite element model for structural analysis. Analysis showed that lateral shear stresses of the load-bearing walls were higher than their acceptable limits when subjected to code specified loading. The flexural strengths of the RC beams were also found to be inadequate. As a solution, the beams were retrofitted with U shaped reinforced concrete jackets, while two alternative methods were proposed for the retrofitting of the load-bearing walls based on design requirement viz. Ferro-cement overlay (for low stress) and Reinforced Concrete jacketing (for high stress). Stresses under most of the wall strip footings were found to surpass the soil bearing capacity, so retrofitting was done by increasing footing widths to meet the soil’s allowable bearing capacity. Finally, the implementation of the retrofitting design in the actual structure along with the construction procedure has been presented. The present study is expected to provide a comprehensive guideline for engineers to carry out seismic vulnerability assessment, structural retrofitting design, and the procedure of its implementation during field construction in the concerned URM structure.
Analysis and seismic retrofitting of unreinforced masonry building: a case study
Unreinforced masonry structure (URM) consists of a major portion of existing structures in under-developed and developing countries all over the world. Most of these URM structures are non-engineered which usually do not conform to local building codes and would be considered significantly deficient to international standards. So, seismic vulnerability assessment of these URM structures is of major significance. The present paper addresses this issue with a systematic approach to assess and analyze the structural vulnerability of a non-engineered URM building. Consequently, a complete retrofitting design procedure is discussed followed by construction and field implementation. Initially, a detailed engineering assessment of the whole structure was carried out which included site investigation, rigorous laboratory and in-situ tests, and development of a 3D finite element model for structural analysis. Analysis showed that lateral shear stresses of the load-bearing walls were higher than their acceptable limits when subjected to code specified loading. The flexural strengths of the RC beams were also found to be inadequate. As a solution, the beams were retrofitted with U shaped reinforced concrete jackets, while two alternative methods were proposed for the retrofitting of the load-bearing walls based on design requirement viz. Ferro-cement overlay (for low stress) and Reinforced Concrete jacketing (for high stress). Stresses under most of the wall strip footings were found to surpass the soil bearing capacity, so retrofitting was done by increasing footing widths to meet the soil’s allowable bearing capacity. Finally, the implementation of the retrofitting design in the actual structure along with the construction procedure has been presented. The present study is expected to provide a comprehensive guideline for engineers to carry out seismic vulnerability assessment, structural retrofitting design, and the procedure of its implementation during field construction in the concerned URM structure.
Analysis and seismic retrofitting of unreinforced masonry building: a case study
Asian J Civ Eng
Aziz, Ishfaq (author) / Ahsan, Raquib (author) / Sakib, Md. Shadman (author) / Aziz, Shamontee (author) / Islam, Md. Aminul (author) / Ansary, Mehedi Ahmed (author)
Asian Journal of Civil Engineering ; 22 ; 443-460
2021-04-01
18 pages
Article (Journal)
Electronic Resource
English
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