Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Seismic Rehabilitation of Semnan Citadel Gate By Utilizing Base Isolation

Document Type : Original Article

Authors
Kosar Zolfagharian 1
Mahmood Golabchi 2
Mohammad Bagher Kabirsaber 3
Peyman Homami 4
Mahdi Golpayegani 5
1 MSc. student,, Faculty of Architecture, Pars University of Art and Architecture, Tehran, Iran
2 Professor, Faculty of Architecture, Pars University of Art and Architecture, Tehran, Iran
3 Assistant professor, Faculty of Architecture, College of Fine Arts, University of Tehran, Tehran, Iran
4 Associate professor, Faculty of Engineering, Kharazmi University, Tehran, Iran
5 MSc of Structural Engineering,, Civil Engineering Department, Semnan Branch, Islamic Azad University, Semnan, Iran
10.22065/jsce.2024.436691.3336
Abstract
Attention to the historical and valuable buildings that are considered as part of the culture and national identity of every country holds a special place. Most countries spend significant costs to preserve, maintain, and protect such heritage against earthquakes and other destructive factors, as often, historical structures do not meet the requirements of modern seismic design codes and need to appropriate actions to improve performance and reduce seismic vulnerability. One of the historical buildings in the country is the historical gate of Semnan city, called Arg Gate. In recent years, the minarets of Arg Gate in Semnan have been strengthened. The purpose of this research is to improve the seismic behavior of Arg Gate and retrofit it against severe earthquakes. For this purpose, nonlinear time history analysis of the numerical model of the structur has been performed in ABAQUS software. The structure's behavior against strong earthquakes evaluated and it's vulnerability assessed. In addition, another numerical model has been prepared by adding a set of Lead Rubber Bearing (LRB) seismic isolators, which have been considered as a method of retrofitting to reduce the vulnerability if the structure. Both models have been evaluated against 7 earthquake records. The records used have been scaled according to the Iranian Standard 2800 and the behavior of the structure in these two models has been compared. The analysis results indicate that the use of seismic isolators significantly reduces building displacement, drift, and torsional irregularity, and effectively improves the structure's seismic behavior by absorbing earthquake energy. For instance, it is observed that the isolated structure should undergo up to 43% larger base shear compared to the fixed-base structure to reach to the same relative displacement. Superstructure drifts and accelerations reduced by 46% and 78% respectively.
Keywords
Arg Gate Semnan
Seismic improvement
Strengthening Historical Buildings
Seismic isolation
Nonlinear time history Analysis

Subjects

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  • Receive Date 01 May 2024
  • Revise Date 17 June 2024
  • Accept Date 29 September 2024