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In-depth Cyclic and Monotonic Assessment of Innovative Shear Resisting Frames with Haunched Beams (SRFHBs)

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

In this study, an innovative lateral resistant system as steel shear resisting frame with haunched beams (SRFHBs) is introduced and described. The concept of SRFHBs is originated from the shear panels in steel plate shear walls and the link beam of eccentric bracing frames (EBFs). Using SRFHB eliminates the limitation of span-to-depth ratio in moment resisting frames (MRFs), which is the main difficulty in the framed-tube system of high-rise building with closely spaced columns. SRFHB is made up of two strong side columns connected to the link element (shear fuse) through haunched beam, in the middle of span. Utilizing non-prismatic beam makes it feasible achieves any link length, especially in very short ranges, controlled by shear behavior. Shear yielding and out-of-plane deformation caused by tension action field control the amount of SRFHB energy dissipation. In this research, extensive nonlinear finite element analyses are implemented and the seismic characteristics of the SRFHBs with different shear fuse lengths, stiffener layouts and heights are evaluated and compared with conventional EBFs. Results imply higher response modification factor as well as better hysteresis characteristics such as ductility, stability and energy dissipation in comparison with EBFs.

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Abbreviations

SRFHB:

Shear resisting frame with haunched beam

CBF:

Concentrically braced frame

MRF:

Moment resisting frame

SPSW:

Steel plate shear wall

C-SPSW:

Coupled steel plate shear wall

EBF:

Eccentrically braced frame

TRF:

T-resisting frame

RBS:

Reduced beam section

Aw [mm2]:

Web total area of link

b [-]:

Rate of the increase in yield surface

Cd [-]:

Deflection amplification factor

Cv [-]:

Ratio of buckling stress to shear yield stress

d [mm]:

Total depth of link

e [mm]:

Link length

Fy [MPa]:

Specified minimum yield stress

L [mm]:

Span length or beam length

Lp [mm]:

Distance between two flexural plastic hinges

MLink [kN.m]:

Link moment

Mp [kN.m]:

Plastic bending moment of link

Mpb [kN.m]:

Plastic bending moment of prismatic beam

qu [kN/m]:

Gravity loading

Q∞ [-]:

Maximum change in the size of yield surface

RR [-]:

Redundancy factor in determining response modification factor

Rs [-]:

Overstrength factor in determining response modification factor

Ru [-]:

Response modification factor

Ry [-]:

Ratio of the expected yield stress to the specified minimum yield stress

Rμ [-]:

Ductility factor in determining response modification factor

S [mm]:

Stiffeners spacing

tw [mm]:

Web thickness of link

Ve [kN]:

Base shear corresponding to the elastic limit

VLink [kN]:

Link shear

Vn [kN]:

Nominal shear strength of link

Vp [kN]:

Plastic shear of link

Vpb [kN]:

Shear force corresponding to the formation of flexural plastic hinges at beam ends

Vs [kN]:

Base shear corresponding to the formation of the first plastic hinge

Vy [kN:

Base shear corresponding to the yield point

α [-]:

Plasticity concentration coefficient in link

β [-]:

Link overstrength parameter

γp [rad]:

Link inelastic rotation

∆e [mm]:

Displacement corresponding to the elastic limit

∆max [mm]:

Maximum lateral displacement

∆s [mm]:

Displacement corresponding to the formation of the first plastic hinge

∆y [mm]:

Yield displacement

λmd [-]:

Width-to-thickness limitation for moderately ductile members

λhd [-]:

Width-to-thickness limitation for highly ductile members

ρ [-]:

Link length ratio

σ0 [MPa]:

Initial yield stress

φv [-]:

Resistance factor for shear

Ω [-]:

Link overstrength factor

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Authors and Affiliations

  1. Department of Civil Engineering, University of Zanjan, 45371-38791, Zanjan, Iran

    Mohammad Rahnemoun & Payam Ashtari

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  1. Mohammad Rahnemoun
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  2. Payam Ashtari
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Correspondence to Payam Ashtari.

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The authors did not receive support from any organization for the submitted work, and they have no relevant financial or non-financial interest to disclose.

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Rahnemoun, M., Ashtari, P. In-depth Cyclic and Monotonic Assessment of Innovative Shear Resisting Frames with Haunched Beams (SRFHBs). Iran J Sci Technol Trans Civ Eng 46, 925–949 (2022). https://doi.org/10.1007/s40996-021-00665-0

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