Theoretical Design Method for Composite Stiffness under Baseplate of Elastic Indirect Fasteners

WEI Kai; WANG Xian; DING Wenhao; LUO Ting; ZHAO Zeming

doi:10.3969/j.issn.0258-2724.20200860

Volume 57 Issue 5

Oct. 2022

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Journal of Southwest Jiaotong University > 2022 > 57(5): 1000-1007.

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WEI Kai, WANG Xian, DING Wenhao, LUO Ting, ZHAO Zeming. Theoretical Design Method for Composite Stiffness under Baseplate of Elastic Indirect Fasteners[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1000-1007. doi: 10.3969/j.issn.0258-2724.20200860

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Theoretical Design Method for Composite Stiffness under Baseplate of Elastic Indirect Fasteners

doi: 10.3969/j.issn.0258-2724.20200860

WEI Kai^{1, 2
,},
WANG Xian^{1, 2},
DING Wenhao^{1, 2},
LUO Ting^{1, 2},
ZHAO Zeming^{1, 2}

1.
MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 23 Dec 2020
Rev Recd Date: 09 Apr 2021

Available Online: 11 Jul 2022

Publish Date: 07 Sep 2021

Abstract

Abstract

In order to explore the design method of the combined stiffness under the baseplate of the elastic indirect fastener system, improve the error and accuracy in the design of the traditional model, based on nonlinear elastic foundation beam, a theoretical calculation model of composite stiffness under baseplate is proposed. First, the nonlinear elasticity of the baseplate pad is introduced into the continuous foundation beam model, and the beam is divided into multiple calculation elements, so as to establish a theoretical analysis model of the composite stiffness under baseplate reflecting the actual deformation and support characteristics of the baseplate. Moreover, the midpoint stiffness method is adopted to solve the deformation of the baseplate and the composite stiffness under baseplate during imposing the installation torque of anchor bolts and the train load. Secondly, mechanical testing machine is used to test the deformation and composite stiffness of DZ Ⅲ fastener system in the real service state, and validate the theoretical model. Finally, the composite stiffness under baseplate of traditional and theoretical calculation models are calculated in different installation conditions (bolt torque) and baseplate design parameters (thickness and bolt distance), and the design error variation of traditional calculation model under different design baseplate parameters is summarized. The comparative analysis shows that, due to neglecting the iron baseplate deformation and nonlinear elasticity under baseplate, the traditional calculation model has a design error range of 37.75%－94.27% within the installation torque range (150－250 N•m), which fails to meet the error requirements of engineering design. The maximum error of the proposed theoretical calculation model is only 2.91%, which meets the requirements of engineering design. When the thickness of the iron baseplate is low or the bolt spacing is wide, the difference between the actual deformation of the iron baseplate and the calculation assumptions in the traditional calculation model will magnify, and the design error of the traditional calculation model will be further increased.
- elastic indirect fastener,
- composite stiffness under baseplate,
- nonlinear elastic,
- elastic foundation beam,
- midpoint stiffness method

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References(12)

References

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