Document Type : Original Article

Authors

• Shahin Faraji ¹
• Mahnoosh Biglari ²

¹ Master's degree Civil Engineering Dept., Faculty of Engineering, Razi University, Kermanshah, Iran

² Associate Professor Civil Engineering Dept., Faculty of Engineering, Razi Univ., Kermanshah, Iran

Abstract

Iran is a seismically active country that has experienced many human casualties from earthquakes. By understanding seismic behavior and applying proper retrofitting strategies, it is possible to reduce future damage. On November 11, 2017, the Mw 7.3 Sarpol-e-zahab earthquake struck a large part of Kermanshah Province in western Iran. The earthquake caused extensive damage to buildings in Sarpol-e-zahab city. In this study, the nonlinear behavior of an unreinforced masonry fire station building located in Sarpol-e-zahab city was investigated. The damage to this structure, including diagonal cracks in the walls, served as the basis for validating the analyses performed. The structure was modeled and analyzed using a nonlinear dynamic method to develop retrofitting solutions. This structure performed poorly due to large openings in the X-direction and the absence of an effective cross-sectional area in the walls. Shotcrete was proposed as a retrofitting method. Using this approach, the elastic stiffness in the X-direction was improved by 47.2%, the behavior factor increased by 2.5 times, and the ductility ratio increased by 15.9% compared to the initial condition. Additionally, after retrofitting, the same parameters in the Y-direction showed significant improvements, with elastic stiffness increasing by 26.5%, the behavior factor by 16.2%, and the ductility ratio by 56.9%, demonstrating improved performance compared to before.

Keywords

• Unconfined masonry building
• Seismic retrofitting
• Shotcrete
• Nonlinear dynamic analysis
• Nonlinear static analysis

Main Subjects

• Earthquake