|Table of Contents|

Study on Mechanical Behavior of GFRP-steel Composite Truss Girder with Different Structural Combination Forms(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年02期
Page:
61-68
Research Field:
结构工程
Publishing date:

Info

Title:
Study on Mechanical Behavior of GFRP-steel Composite Truss Girder with Different Structural Combination Forms
Author(s):
HAO Jian-ming;  LIU Yuan;  HAO Xian-wu
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
GFRP-steel composite truss girder;  midspan deflection;  member replacement;  common working coefficient
PACS:
TU311
DOI:
10.19815/j.jace.2021.05042
Abstract:
In order to study the mechanical behavior of glass fiber reinforced plastic(GFRP)-steel composite structure, the physical and mechanical parameters of GFRP material were determined according to the theory of anisotropic elasticity mechanics. Based on the engineering example of the working bridge in the Huaihe River estuary gate area, the finite element model of the truss girder based on the plate-shell element was established by ABAQUS, and the mechanical behavior were analyzed. The structural combination scheme of replacing some GFRP members with large stress into steel members was adopted, and the changes of structural self-weight, mid-span deflection and element stress were compared and analyzed to explore a reasonable member replacement scheme. The concept of unified bending stiffness of composite truss girder was introduced, and the truss structure was equivalent to single beam model for simplified calculation. The cross-section common working coefficient was introduced to describe the bending contribution of truss girder web member to integral structure. The results show that under the action of basic load combination, the stress of each component of GFRP truss girder is far less than the material strength, and there is a high safety reserve. Replacement of some members can effectively increase the vertical stiffness of the structure and reduce the midspan deflection under load. The scheme of replacing the upper and lower chords with Q345 steel has a great contribution to enhancing the vertical stiffness of the truss girder, and the structural form is reasonable. The research can provide reference for the design of similar projects.

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Last Update: 2022-03-20