Assessment of Seismic Specification of Retrofitting RC Moment Resisting Frames Using Inclined Tensile Members Mesh and Unstiffened Steel Shear Walls- An Experimental Study

Document Type : Original Article

Authors

1 Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.

2 Associate Professor, Department of Civil Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.

Abstract

Due to lack of sufficient concrete strength or change in design guidelines, some RC structures are in need of retrofitting. RC moment resisting frames can be retrofitted through various methods such as different types of braces, steel jackets, steel or concrete shear walls, etc. Retrofitting the structure and reassessing it is only possible if the characteristics of the new compound seismic system are known. In this study, the behavior of the RC moment resisting frame retrofitted with inclined members mesh and steel shear walls in the face of cyclic lateral load is investigated. Three specimens of RC moment resisting frames of the scale 1:3, with identical dimensions, reinforcement and concrete strength were built. Two of the specimens were retrofitted with steel shear walls or inclined members mesh, using the same amount of steel. Finally, stiffness, strength reduction factor, ductility, strength and energy absorption of the samples were calculated and compared. The results show that both retrofitting methods improve the seismic properties of the structure but the inclined tensile member mesh yielded a better performance compared to the steel shear wall. While carrying out the linear or nonlinear analyses of the retrofitting of RC frames, special attention should be paid when equalizing steel shear walls with inclined tensile members due the difference between their stiffness.

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References

[1] Thorburn, L. J., Montgomery, C. J., & Kulak, G. L. (1983). Analysis of steel plate shear walls.
[2] Timler, P. A., & Kulak, G. L. (1983). Experimental study of steel plate shear walls.
[3] Driver, Robert George. (1998). Seismic behaviour of steel plate shear walls. Dept. of Civil and Environmental Engineering,University of Alberta.
[4] Astaneh‐Asl, A. (2008). Steel shear walls, behavior, modeling and design. In AIP Conference Proceedings (Vol. 1020, No. 1, pp. 5-18). American Institute of Physics.
[5] Ozcelik, Y., & Clayton, P. M. (2017). Strip model for steel plate shear walls with beam-connected web plates. Engineering Structures, 136, 369-379.
[6] Wang, M., & Yang, W. (2018). Equivalent constitutive model of steel plate shear wall structures. Thin-Walled Structures, 124, 415-429.
[7] Mu, Z., & Yang, Y. (2020). Experimental and numerical study on seismic behavior of obliquely stiffened steel plate shear walls with openings. Thin-Walled Structures, 146, 106457.
[8] Khan, N. A., & Srivastava, G. (2020). Models for strength and stiffness of steel plate shear walls with openings. Structures, 27, 2096-2113.
[9] Pincheira, Jose A., and James O. Jirsa. (1995). Seismic response of RC frames retrofitted with steel braces or walls. Journal of Structural Engineering, 121(8), 1225-1235.
[10] Ghobarah, A., and H. Abou Elfath. (2001). Rehabilitation of a reinforced concrete frame using eccentric steel bracing. Engineering structures, 23(7), 745-755.
[11] Youssef, M. A., H. Ghaffarzadeh, and M. Nehdi. (2007). Seismic performance of RC frames with concentric internal steel bracing. Engineering Structures, 29(7), 1561-1568.
[12] Mazzolani, F. M. (2008). Innovative metal systems for seismic upgrading of RC structures. Journal of Constructional Steel Research, 64(7), 882-895.
[13] Donatello, Cardone, and Giuseppe Gesualdi. (2014). Seismic rehabilitation of existing reinforced concrete buildings with seismic isolation: a case study. Earthquake Spectra, 30(4), 1619-1642.
[14] TahamouliRoudsari, M., Entezari, A., Hadidi, M., & Gandomian, O. (2017). Experimental assessment of retrofitted RC frames with different steel braces. Structures, 11, 206-217.
[15] TahamouliRoudsari, M., Eslamimanesh, M. B., Entezari, A. R., Noori, O., & Torkaman, M. (2018). Experimental assessment of retrofitting RC moment resisting frames with ADAS and TADAS yielding dampers. Structures, 14, 75-87.
[16] Hu, B., Lv, H. L., & Kundu, T. (2019). Experimental study on seismic behavior of reinforced concrete frame in primary and middle schools with different strengthening methods. Construction and Building Materials, 217, 473-486.
[17] Rahimi, A., & Maheri, M. R. (2020). The effects of steel X-brace retrofitting of RC frames on the seismic performance of frames and their elements. Engineering Structures, 206, 110149.
[18] International Organization for Standardization (ISO). ISO 898-1. (2009). mechanical properties of fasteners made of carbon steel and alloy steel —Part 1: bolts, screws and studs with pecified property classes — coarse thread and fine pitch thread. Geneva. Switzerland.
[19] ACI 374 Committee. 374.1-05. (2006). Acceptance Criteria for Moment Frames Based on Structural Testing and Commentary. American Concrete Institute. Farmington Hills. Mich..
[20] FEMA 356. (2000). Prestandard and Commentary for the Seismic Rehabilitation of Buildings. Prepared by the American Society of Civil Engineers for the Federal Emergency Management Agency. Washington D.C.

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History

  • Receive Date: 11 June 2020
  • Revise Date: 04 December 2020
  • Accept Date: 20 January 2021

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