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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2014, Vol. 8 Issue (4) : 414-426     https://doi.org/10.1007/s11709-014-0276-4
RESEARCH ARTICLE |
Numerical study of the cyclic load behavior of AISI 316L stainless steel shear links for seismic fuse device
Ruipeng LI1,Yunfeng ZHANG1,2,*(),Le-Wei TONG2
1. Department of Civil & Environmental Engineering, University of Maryland, College Park, Maryland 21042, USA
2. State key laboratory for Disaster Reduction in Civil Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
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Abstract

This paper presents the results of nonlinear finite element analyses conducted on stainless steel shear links. Stainless steels are attractive materials for seismic fuse device especially for corrosion-aware environment such as coastal regions because they are highly corrosion resistant, have good ductility and toughness properties in combination with low maintenance requirements. This paper discusses the promising use of AISI 316L stainless steel for shear links as seismic fuse devices. Hysteresis behaviors of four stainless steel shear link specimens under reversed cyclic loading were examined to assess their ultimate strength, plastic rotation and failure modes. The nonlinear finite element analysis results show that shear links made of AISI 316L stainless steel exhibit a high level of ductility. However, it is also found that because of large over-strength ratio associated with its strain hardening process, mixed shear and flexural failure modes were observed in stainless steel shear links compared with conventional steel shear links with the same length ratio. This raises the issue that proper design requirements such as length ratio, element compactness and stiffener spacing need to be determined to ensure the full development of the overall plastic rotation of the stainless steel shear links.

Keywords hysteretic damper      eccentrically braced frame      energy dissipation      seismic      stainless steel      shear link     
Corresponding Authors: Yunfeng ZHANG   
Issue Date: 12 January 2015
 Cite this article:   
Yunfeng ZHANG,Le-Wei TONG,Ruipeng LI. Numerical study of the cyclic load behavior of AISI 316L stainless steel shear links for seismic fuse device[J]. Front. Struct. Civ. Eng., 2014, 8(4): 414-426.
 URL:  
http://journal.hep.com.cn/fsce/EN/10.1007/s11709-014-0276-4
http://journal.hep.com.cn/fsce/EN/Y2014/V8/I4/414
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Yunfeng ZHANG
Le-Wei TONG
Ruipeng LI
section bf/mm tf/mm tw/mm d/mm L/mm ts/mm web stiffeners
W10×33 202.2 11.0 7.4 247.0 733.2 10.0 4@147 mm
W12×50 205.2 16.3 9.4 309.9 863.3 10.0 3@216 mm
W14×74 256.5 19.9 11.4 360.7 1070.6 11.4 3@268 mm
W16×77 261.6 19.3 11.6 419.1 1090.3 11.6 4@218 mm
Tab.1  Dimensions and section details of the four shear link beams
E0/GPa ν σ 0.01 /MPa σ 0.2 /MPa σ u /MPa ? u
SS316L 190 0.31 190 316 616 0.51
Tab.2  Parameter values of 316L stainless steel material model (adapted from Rasmussen [9])
Fig.1  Stress-strain relationship of AISI 316L stainless steel under monotonic load
C1 γ1 C2 γ2 k R0 R b
A992 5206 62 8400 200 389 3 99 19
AISI 316L 149861 956 608 5 190 173 71 29
Tab.3  Calibrated hardening parameters for ASTM A992 steel and AISI 316L stainless steel
Fig.2  Illustration of combined strain hardening model for AISI 316L stainless steel. (a) Isotropic strain hardening model; (b) kinematic strain hardening model; (c) combined hardening model
Fig.3  Side view of ANSYS finite element model of link beams: (a) W10 × 33 link beam; (b) W12 × 50 link beam; (c) W14 × 74 link beam; (d) W16 × 77 link beam (right side section of the model are fixed)
Fig.4  Cyclic load history applied to shear link specimens
sections Vy/kN Vu/kN Ω
W10 × 33 A992 496.9 666.8 1.34
AISI 316L 437.5 698.1 1.60
W12 × 50 A992 777.1 1030 1.33
AISI 316L 671.3 1085 1.62
W14 × 74 A992 1104 1455 1.32
AISI 316L 970.5 1552 1.60
W16 × 77 A992 1295 1722 1.33
AISI 316L 1153 1831 1.59
Tab.4  Yield strength, ultimate strength, and over-strength factor of the link beams
Fig.5  Hysteresis loops of W10 × 33 link beams under cyclic loading
Fig.6  Hysteresis loops of W12 × 50 link beams under cyclic loading
Fig.7  Hysteresis loops of W14 × 74 link beams under cyclic loading
Fig.8  Hysteresis loops of W16 × 77 link beams under cyclic loading
Fig.9  Backbone curve from hysteresis loops of shear link specimens: (a) W10 × 33 link beam; (b) W12 × 50 link beam; (c) W14 × 74 link beam; (d) W16 × 77 link beam
Fig.10  Plastic shear strain contour of W10 × 33 link beams at link rotation γ = 0.015 rad. (a) A992 steel; (b) AISI 316L stainless steel
Fig.11  Plastic shear strain contour of W12×50 link beams at link rotation γ = 0.015 rad. (a) A992 steel; (b) AISI 316L stainless steel
Fig.12  Plastic shear strain contour of W14×74 link beams at link rotation γ = 0.015 rad. (a) A992 steel; (b) AISI 316L stainless steel
Fig.13  Plastic shear strain contour of W14×74 link beams at link rotation γ = 0.015 rad. (a) A992 steel; (b) AISI 316L stainless steel
Fig.14  Plastic shear strain contour of W16×77 link beams at link rotation γ = 0.015 rad. (a) A992 steel; (b) AISI 316L stainless steel
C1, γ1 calibrated constants in the equation for χ 1
C2, γ2 calibrated constants in the equation for χ 2
bf specimen flange width
E0 initial elastic modulus
e, m, n calibrated material constants for AISI 316L stainless steel in the two-stage stress strain model modified by K Rasmussen
ρ length ratio of a link beam
d specimen height
k initial yield stress
L specimen length
Mp plastic moment of a link beam
R yielding surface expansion
R 0 , R , b calibrated constants in the equation for R
sgn(x) sign symbol, which takes values among -1, 0, and 1 depending on the sign of x
tf specimen flange thickness
tw specimen web thickness
ts specimen stiffener thickness
Vp plastic shear force of a link beam
Vu ultimate strength of a link beam
Vy yield strength of a link beam
σ stress
σ 0.01 stress at 0.01% plastic strain
σ 0.2 stress at 0.2% plastic strain
σ u ultimate stress
? strain
? u ultimate strain
? p plastic strain
? p accumulated plastic strain
χ back stress derived from the nonlinear kinematic model
χ 1 back stress of the first Chaboche model
χ 2 back stress of the second Chaboche model
ν Poisson’s Ratio
γ link rotation angle of the shear link
Ω over-strength factor
Tab.5  
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