Seismic retrofitting of low-rise reinforce concrete frame buildings with masonry infill walls in Nepal by mesh reinforcement | |
| Author | Wagle, Sharad |
| Call Number | AIT Thesis no.ST-18-06 |
| Subject(s) | Buildings, Reinforced concrete--Earthquake effects Earthquake resistant design Masonry--Earthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-18-06 |
| Abstract | Nepal is geologically located at the tectonic plate boundary of Indian plate and the Eurasian plate. This is a convergent boundary in which Indian plate subducts under the Eurasian plate. The reinforced concrete (RC) building construction in Nepal has begun from the late 1970s and in the last decades it increased rapidly replacing the other construction techniques. Most of the buildings constructed in urban area are RC infilled with burnt clay masonry buildings and these buildings have the structural deficiencies such as strong beam weak column, inadequate splice length, insufficient confinement, lack of ties in beam column joints, low concrete strength and irregularity in plan and elevation. Due to the asymmetric distribution of infill wall and opening can create vertical and horizontal irregularities which change the overall seismic behavior of the building leading to torsional and soft story failure. Two buildings of three and a half story typically constructed in Nepal are selected for this study. The nonlinear seismic performance of the building is evaluated before and after the seismic retrofit of the buildings. The Perform-3D software is used for the nonlinear time history analysis of the buildings. The four diverse groups of probable earthquake ground motion with different level of shaking are used for the analysis. The total of 33 ground motions in X and Y direction are used for this study. The infill wall retrofitting with mesh reinforcement is used as a strengthening technique. The analysis results are expressed in terms of story drift, deflection, story shear and plastic rotation. The damage of case study building is concentrated in ground floor for all the applied ground motions. The case study building-1 performs within life safety level for all the applied ground motion with some damage in the infill wall and the building-2 fails by the soft story mechanism with the failure of all the infill walls in the ground floor for near fault pulse like ground motion. The infill wall strengthening technique improves the seismic performance of the building-2 to a life safety performance level for severe earthquakes. |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-18-06 |
| 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) | Punchet Thammarak;Thanakorn Pheeraphan,|eExamination committee; |
| Scholarship Donor(s) | Asian Development Bank-Japan Scholarship Program (ADB-JSP); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2018 |