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Abstract

The overall nodes at the support positions are subjected to large forces, often resulting in stress concentration and excessive local stress. To study the force characteristics of the overall nodes at the support positions and provide a basis for design optimization, this paper took the MG22 node of Guangzhou Mingzhu Bay Bridge as the research background and established an Ansys finite element model considering the support effect. The stress distribution law and structural optimization method of this node were studied. The results show that the welded end of the vertical stiffening ribs of the support is usually the stress concentration area. The local stiffness of the structure within the support range and the smoothness of the stiffness change will directly affect the stress peak of the overall node. Optimizing the distribution and coverage of the stiffening ribs in this area can make the force transmission of the plate more reasonable, thereby improving the stress condition of the overall node. After optimization, the amplitudes of the maximum equivalent stress and fatigue stress of the plate decrease to 328.7 MPa and 38.2 MPa, respectively. The stress distribution of the nodal plate and the base plate becomes more uniform. Among them, the peak value of the equivalent stress and the amplitude of the maximum fatigue stress of the nodal plate decrease from 416.6 MPa to 307.2 MPa and from 59.1 MPa to 33.5 MPa, respectively. The equivalent stress peak and the maximum fatigue stress amplitude of the base plate decrease from 396.8 MPa to 257.5 MPa and from 38.3 MPa to 25.2 MPa, respectively. The stress levels of each plate have been greatly reduced, verifying the rationality of the node structure and the effectiveness of force transmission.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.014

First Page

74

Last Page

79

Submission Date

May 2025

Reference

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