Mechanical Behavior of Assembled Steel Dampers with Optimized Shapes

Abstract:

A metallic shear damper is developed with the shape optimized by stress contour lines to mitigate the stress concentration, reduce the effect of hot welds, and improve the efficiency of energy consumption. The stress contour line is defined according to the J2 plasticity theory, where the micro units yield simultaneously. To demonstrate the effectiveness of the proposed shape-optimization method and the correctness of design formulas, detailed FEM models were built for nine dampers. And the influence of the axial loads was studied as well. Finally, seven damper specimens were fabricated and tested quasi-statically, including six optimized dampers and one with a rectangle shape as a comparison. Both numerical simulation and physical tests demonstrate that the distribution of plastic deformation is more uniform, and the accumulated equivalent plastic strain is reduced significantly, compared with the non-optimized damper. The proposed metallic shear damper has a good low-cycle fatigue capability and a stable energy-dissipation capacity. The stiffness and strength design equations predicted the specimen performance very well.

• Periodical: Key Engineering Materials (Volume 763)
• Pages: 959-966
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.763.959
• Online since: February 2018
• Authors: Bai Jie Zhu, Tao Wang*, Ling Xin Zhang
• Keywords: Assembled Damper, Mechanical Properties, Shape Optimization, Steel Shear Panel Damper, Yield Stress Contour Line

References

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

DOI: 10.5459/bnzsee.5.3.63-88

[2] Ge H, Chen Z, Usami T. Hysteretic model of stiffened shear panel dampers. Journal of Structural Engineering 2006; 132(3): 478-483.

DOI: 10.1061/(asce)0733-9445(2006)132:3(478)

[3] Koike Y, Yanaka, Tsutomu U, Akihisa. et al. An experimental study on developing high-performance stiffened shear panel dampers. Journal of Structural Engineering 2008; 54: 372-381.

[4] Koike Y, Yanaka T, Kasugai. A performance test of stiffened shear panel dampers. Yokogawa Bridge Holdings Group Technical Report 2008; 30-37.

[5] Chusilp P, Usami T, Ge H, et al. Cyclic shear behavior of steel box girders: experiment and analysis. Earthquake Engineering & Structural Dynamics 2002; 31(11): 1993-(2014).

DOI: 10.1002/eqe.200

[6] Tanaka K, Miyama T, Meng L, et al. Study on the passive-vibration controlled building with low-yield-point steel damper: Part 6. Test of dampers with shear panel stiffened by rib plates: outline and results of the tests[C]/. Architectural Institute of Japan 1995; 651-652.

[7] Ohsaki M, Nakajima T. Optimization of link member of eccentrically braced frames for maximum energy dissipation. Journal of Constructional Steel Research 2012; 75: 38-44.

DOI: 10.1016/j.jcsr.2012.03.008

[8] Zhang C, Zhang Z, Shi J. Development of high deformation capacity low yield strength steel shear panel damper. Journal of Constructional Steel Research 2012; 75(7): 116-130.

DOI: 10.1016/j.jcsr.2012.03.014

[9] Liu Y, Aoki T, Shimoda M. Strain distribution measurement of a shear panel damper developed for bridge structure. J Struct 2013; 1-11.

DOI: 10.1155/2013/615275

[10] Liu Y, Shimoda M. Shape optimization of shear panel damper for improving the deformation ability under cyclic loading. Structural and Multidisciplinary Optimization 2013; 1-9.

DOI: 10.1007/s00158-013-0909-6

[11] Deng K, Pan P, Sun J, et al. Shape optimization design of steel shear panel dampers. Journal of Constructional Steel Research 2014; 99(8): 187-193.

DOI: 10.1016/j.jcsr.2014.03.001

[12] Deng K, Pan P. Experimental study of steel shear panel dampers with varying cross-sections. Engineering Mechanics 2016; 99(8): 187-193.

[13] Xu L, Nie X, Fan J. Cyclic behavior of low-yield-point steel shear panel dampers. Engineering Structures 2016; 391-404.

DOI: 10.1016/j.engstruct.2016.08.002