Improving the nonlinear behavior of diagonal CBF braces using a damper in arc shape

Yousefi, Mohsen; Nasira, Yahya; Ghamari, Ali

doi:10.22065/jsce.2021.269901.2347

Improving the nonlinear behavior of diagonal CBF braces using a damper in arc shape

Document Type : Original Article

Authors

mohsen yousefi

Yahya Nasira

Ali Ghamari

10.22065/jsce.2021.269901.2347

Abstract

The energy absorber device improves the seismic behavior of structures against seismic loads. Despite the proper performance of the dampers against seismic loads, they impose additional costs on the structure. Therefore, in this paper, a new damper is introduced which, in addition to improving the seismic behavior, imposes a small cost on the structure. To evaluate the performance of the proposed damper, 15 numerical samples were simulated by Abacus software. under cyclic loading. The study of cyclic behavior was performed on a steel frame of one story-one bay and the sensitivity of cyclic behavior was studied based on the parameters of thickness, length and dimension to the thickness of the brace and slenderness of brace. The thicknesses of the damper are, respectively, 12, 21 and 30 mm, the length of the damper is 400, 500 and 600 mm, the geometry of the damper is arc and the thickness of the brace is 12, 21 and 30 mm. Numerical simulation was performed. The results of this study showed that this type of damper has a good performance in energy dissipation imposed on the structure. Although the proposed damper improves the energy absorption of the structure, it will also reduce the stiffness.

Keywords

Metallic damper

Energy dissipation

Shear Yielding

CBF system

Stiffness

Subjects

Structural Analysis and Design (Steel)

[1] Kelly, J.M., Skinner, R.I., Heine, A.J. (1972). Mechanisms of energy absorption in special devices for use in earthquake resistant structures. Bulletin of New Zealand Society for Earthquake Engineering, 5(3),63–88.

[2]Gray, M.G., Christopoulos, C.,Packer, J.A.(2010). Cast steel yielding fuse for concentrically braced frames. In Proceedings of the 9th US national and 10th Canadian conference on earthquake engineering,Canada

[3]Tsai, K.C., Chen, H.W., Hong, C.P., Su, Y.F. (1993). Design of steel triangular plate energy absorbers for seismic resistance construction Earthquake Spectra.

[4]Ghaffary, A., Mohammadi, R. (2018). Framework for virtual hybrid simulation of TADAS frames using opensees and Abaqus. Journal of Vibration and Control, 11(24), 2165-2179.

[5]Mohammadi, R., Karami, R., Nasri, A., Ghaffary, A. (2017). TADAS dampers in very large deformations." International Journal of Steel Structures, 7(15),515-524

[6]Taylor, D.P., Constantinou, M.C. (1995). Testing procedures for high-output dampers used in building and bridge structures to dissipate seismic energy Shock Vibration,2(5),373–381.

[7]Maleki, S., Mahjoubi, S. (2014).Infilled-pipe damper. Journal of Constructional Steel Research, 9(8), 45-58.

[8]Lee, C., H, J.u., Y, K., Min, J.K., Lho, S.H., Kim, S.D. (2015). Non-uniform steel strip dampers subjected to cyclic loadings. Engineering Structures, 8(9),192-204.

[9]Sahoo, D.R., Singhal, T., Taraithia, S.S., Saini, A. (2015). Cyclic behavior of shear-and-flexural yielding metallic dampers. Journal of Constructional Steel Research, (11)4, 247-257.

[10]Ghabraie, K., Chan, R., Huangb, X., Xie, Y.M.(2010). Shape optimization of metallic yielding devices for passive mitigation of seismic energy Engineering Structures, (3)2, 2258-2267

[11]Maleki, S., Mahjoubi, S.,(2014). Infilled-pipe damper. Journal of Constructional Steel Research, 9(8),45-58.

[12]Hashemi, S.V., Pouraminian, M., Sadeghi, A.A. (2020). Seismic Fragility Curve Development of Frames with BRB’s Equipped with Smart Materials subjected to Mainshock-Aftershock Ground Motion. Journal of Structural and Construction Engineering,doi;10.22065/JSCE.2021.235080.2169

[13]Pouraminian, M., Hashemi, S.V., Sadeghi, A.A., Pourbakhshian,S.(2020). Probabilistic Assessment the Seismic Collapse Capacity of Buckling-Restrained Braced Frames Equipped with Shape Memory Alloys, Journal of Structural and Construction Engineering,doi;10.22065/JSCE.2020.236804.2174

[14] Garivani, S., Aghakouchak, A.A. & Shahbeyk, S. Numerical and experimental study of comb-teeth metallic yielding dampers. Int J Steel Struct 16, 177–196 (2016). https://doi.org/10.1007/s13296-016-3014-z

[15] Zahrai, M.(2015). Cyclic testing of chevron braced steel frames with IPE shear panels. Steel and Composite Structures, 5(9), 1167-1184

[16] Li HN, Li G. Experimental study of structure with dual function metallic dampers. Engineering Structures. 2007;2(9):1917–1928