| Author | Eltaf, Mohammad Ali |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering
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| Publisher | Asian Institute of Technology |
| Abstract | Using of infill walls is a common practice as partitions in RC frame buildings in all around the world. Usually buildings are designed as bare frame and the effect of the infill walls is not considered in design period. Infill walls change the predicted behavior of buildings during earthquake actions. Most of the existing infilled RC frame buildings have not been designed for seismic loads. Recent earthquakes have shown that infilled RC frame buildings performed poorly under seismic loadings, damage of infill walls identified as the main cause of loos of life, serviceability, property and harming injuries. An appropriate reinforcing system for strengthening of infill walls is necessity in order to achieve an upgrading to the necessary seismic and energy dissipation capacity. Different infill walls strengthening systems in respect of materials, configuration, difficulties in their application and effectiveness have been proposed and studied in last decades.
In the present study a typical four and half story infilled RC frame residential building in Kabul city, Afghanistan which lies in active seismic part of the world was selected. Using of carbon fiber reinforced polymer (CFRP) and textile reinforced mortar (TRM) were adopted as strengthening systems of masonry walls. Seismic performance of the building was evaluated using nonlinear three dimensional dynamic time history analysis and pushover static analysis on nonlinear model of the building in Perform 3D as a tool. Seismic performance of unretrofitted building is poor, concentration of inelastic deformation at the first floor columns and collapsing of its infill walls leading to a soft story mechanism. Adopted strengthening systems provided additional lateral strength and sufficient stiffness and control soft story mechanism. Obtained result from CFRP retrofitted model analysis showed significant reduce of inelastic deformation in the columns and shifted damage condition of infill walls from collapse state to extensive cracking. By used method the building can withstand with severe cracking of infill walls and minor damage of frame elements against strong ground motions. Observed result from second retrofit method is a good result as well. The stiffness and strength of the building is not high as CFRP method, it allow the building to exhibit more flexibility. Damage condition and inelastic deformation dominated in the second method, but in the first approach the frequency of the building shifted towards the critical zone of response spectrum for the strong ground motion, so the second method can serve effectively to reduce the brittle failure and increase ductility capacity. |
| Keyword | Unreinforced masonry walls, Infilled RC frame, carbon fiber reinforced polymer, textile reinforced mortar, soft story, seismic performance, nonlinear dynamic time history analysis.
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| Year | 2018 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Infrastructure Planning and Management (IP) |
| Chairperson(s) | Pennung Warnitchai ; |
| Examination Committee(s) | Anwar, Naveed;Punchet Thammarak ; |
| Scholarship Donor(s) | Ministry of Higher Education (MoHE), Afghanistan – AIT Fellowship ; |