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Numerical and Theoretical Study on Mechanical Behaviors of New Dovetail Joint System (NDJs) Subjected to Tensile, Compressive, and Out-of-plane Bending Moment Forces

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Abstract

In this study, a new dovetail system of single-layer reticulated shell socketed joint (NDJs) of steel with excellent mechanical behaviour and economic benefits is suggested and investigated. Theoretical and numerical approaches were adopted to explore the influence of the different design parameters on the mechanical behaviour of NDJs under axial tension, compression forces and out-of-plane bending moment. First, NDJs exhibited two main failure modes under compressive force which occurred in the H-section beam and throat neck. On the other hand, the failure of the NDJs under tensile force occurred on the slot edges and hub ring, which means the NDJs TYS bearing capacity is responsive to slot edge width (\({\mathrm{d}}_{\mathrm{m}}\)) and hub ring thickness (\({\mathrm{d}}_{\mathrm{w}}\)). Moreover, the resisting bending failure characteristics of NDJs combined characteristics of resisting compressive and tensile forces. Second, formulae of compressive, tensile, and bending yield strength bearing capacity of NDJs were derived, and the average of analytical to numerical results was calculated. Analytical analysis results matched very well with the FEA results and showed a very high calculation validity and efficiency. Finally, NDJs shows excellent behaviour under different axial loads and bending moment comparing with other types of bolted or assembled joints with the same size or used materials.

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Abbreviations

NDJs :

New Dovetail Joint system

\({A}_{n}\) :

Slot design angle

CYS :

Compressive yield strength

t :

Gap between hub slot and throat tail

TYS :

Tensile yield strength

\({\varphi }_{1}\) :

Curvature angle

BYS :

Bending yield strength

\({T}_{neck}\) :

Tensile strength of the beam neck

FEA :

Finite element analysis

\({A}_{neck}\) :

Effective area of the beam neck

FE :

Finite element

\({T}_{hub}\) :

Tensile strength of the hub

D :

Hub external diameter (mm)

\({f}_{v}\) :

Material shear strength

d :

Hub internal diameter (mm)

\({f}_{y}\) :

Material yield strength

\({d}_{s}\) :

Slot depth (mm)

P :

Force

\({d}_{w}\) :

Thickness of the hub ring (mm)

\({T}_{ht}\) :

Theoretical TYS bearing capacity of NDJs

\({d}_{t}\) :

Max thickness of the hub body

\({T}_{hn}\) :

Numerical TYS bearing capacity of NDJs

\({d}_{m}\) :

Width of the slot edge

\(A\) :

Throat area

r :

Emptied area3 diameter (mm)

\(H\) :

Throat height

\({L}_{s}\) :

Max width of hub slot (mm)

\(L\) :

Throat length

\({l}_{s}\) :

Min width of hub slot (mm)

\(B\) :

The area of the upper or lower removed part

H :

Hub height (mm)

\({h}_{1}\) :

The height of removed part

H :

Height of H-section beam (mm)

\(\beta\) :

Throat slope ratio

\({h}^{`}\) :

Tail height (mm)

\({C}_{beam-throat}\) :

CYS bearing capacity of the beam

\({L}_{B}\) :

Max width of beam tail (mm)

\({A}_{\mathrm{t}hroat}\) :

Section area of the throat

\({l}_{b}\) :

Min width of beam tail (mm)

\({C}_{hub}\) :

CYS bearing capacity of NDJs hub

\({f}_{b}\) :

Thickness of H-section beam web (mm)

\({C}_{ht}\) and \({C}_{hn}\) :

Theoretical and numerical CYS bearing capacity of hub

\({w}_{t}\) :

Thickness of H-section beam flange (mm)

\({N}_{c}\) :

Axial compression force

w :

H-section beam flange width (mm)

\({A}_{beam}\) :

Area of H-section beam

\({w}_{h}\) :

H-section beam web height (mm)

\(\varphi\) :

Axially compressed member stability factor

\({l}_{th}\) :

Length of the throat (mm)

\({C}_{bt}\) and \({C}_{bn}\) :

Theoretical and numerical CYS bearing capacity of beam-throat

\({s}^{`}\) :

Neck length (mm)

\({C}_{jC}\) :

Beam to Hub CYS bearing capacities ratio

\({t}_{h}\) :

Length of the H-section beam inserted tail (mm)

\(\rho\) :

Reduction factor

θ :

Slope angle of the throat

\({M}_{Jt}\) and \({\mathrm{M}}_{\mathrm{Jn}}\) :

Theoretical and numerical BYS bearing capacity of NDJs

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China

    Zhihua Chen & Hongbo Liu

  2. Department of Civil Engineering, Tianjin University, Tianjin, 300072, China

    W. A. H. Mashrah, Zhihua Chen & Hongbo Liu

  3. Key Laboratory of Coast Civil Structure and Safety of Ministry of Education, Tianjin University, Tianjin, 300072, China

    Zhihua Chen & Hongbo Liu

Authors
  1. W. A. H. Mashrah
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  2. Zhihua Chen
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  3. Hongbo Liu
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Correspondence to W. A. H. Mashrah.

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Mashrah, W.A.H., Chen, Z. & Liu, H. Numerical and Theoretical Study on Mechanical Behaviors of New Dovetail Joint System (NDJs) Subjected to Tensile, Compressive, and Out-of-plane Bending Moment Forces. Int J Steel Struct 21, 1108–1133 (2021). https://doi.org/10.1007/s13296-021-00492-z

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