|Table of Contents|

Failure mode of rectangular concrete-filled steel tubular continuous composite truss beam(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年3期
Page:
76-92
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Failure mode of rectangular concrete-filled steel tubular continuous composite truss beam
Author(s):
MA Guo-gang1; 2;  PU Bei-chen1; 2;  JIANG Lei1;  LIU Yong-jian1;  LIU Bin1; 2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Cscec Aecom Consultants Co. Ltd., Lanzhou 730030, Gansu, China)
Keywords:
bridge engineering;  CFRST composite truss beam;  FEM;  whole failure process;  plastic hinge model;  failure mechanism
PACS:
U443.35
DOI:
10.19721/j.cnki.1671-8879.2024.03.007
Abstract:
In order to provide reference for theengineering design of CFRST composite truss bridges and assist in the further promotion and application of thisbridge type, the finite element method verified by the test results was used to analyze the whole failure processof the stress of the main truss, concrete deck slab, steel reinforcements, core concrete, and the yielding andplastic deformation of members. Meanwhile the reasonable failure mechanism of CFRSTcontinuous composite truss beam based on the section plastic hinge model was proposed. Regarding thesectional stiffness, bearing capacity, and whether the structure has a reasonable failure mode as the evaluationindex, the research was carried out on the reasonable value range of a series of design parameters such as thereinforcement ratio of bridge deck slab, the thickness of bridge deck slab, the wall thickness ratio of the braceand chord, and strength grade of concrete filled in the chord. The results show that the reasonable rangeof reinforcement ratio of bridge deck slab should be 1.39% to 2.31%, the thickness of the bridge deck slab has amore significant impact on the bearing capacity of the negative bending moment region of the composite trussbeam, the reasonable distribution range of the wall thickness ratio of brace to chord should be0.667 to 1.0, theimprovement of concrete strength grade in the lower chord of the mid-support section and the upper chord of themid-span section have a more significant effect on improving the stiffness and bearing capacity of the compositetruss beam.5 tabs, 23 figs, 27 refs.

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Last Update: 2024-05-01