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Mechanical performance analysis of steel-concrete joint section of a long-span hybrid girder cablestayed bridge based on field test(PDF)

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

Issue:
2021年5期
Page:
54-65
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Mechanical performance analysis of steel-concrete joint section of a long-span hybrid girder cablestayed bridge based on field test
Author(s):
WEI Feng1;  LUO Huiwen1;  LIANG Linong2;  XIAO Yongbo1;  SU Cheng1
(1. School of Civil Engineering and Transportation, South China University of Technology,Guangzhou 510641, Guangdong, China; 2. Guangdong Communication Planning &Design Institute Co., Ltd, Guangzhou 510507, Guangdong, China)
Keywords:
bridge engineering;  mechanical performance;  strain test of real bridge;  steelconcrete joint section;  stress distribution
PACS:
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DOI:
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Abstract:
In order to study the mechanical performance of the back bearing plate (without steel grids) steelconcrete joint section of the longspan cablestayed bridge and to verify the reliability of its longitudinal stress transmission, stress distributions of the steelconcrete joint section of the girder and adjacent girder sections during construction and operation stages were studied, with field strain test and numerical analysis on a longspan hybridgirder cablestayed bridge (Jiangshun Bridge). First, the strains of steel plate and concrete of test sections were monitored over time. Based on the monitored strain values, the stresses and distribution laws of the steelconcrete joint section, the adjacent strengthened steel box girder section and the adjacent prestressed concrete (PC) box girder section were obtained. Then the local 3dimension finite element model of the test segment was established in ANSYS software and the related numerical analysis was conducted. Finally, the finite element analysis results were compared with the field test data. The results show that the compressive stress levels of the steelconcrete joint section and its adjacent girder sections are relatively low during the entire test period. The maximum stress of steel plate is -159.4 MPa and the maximum concrete stress is -15.8 MPa. The structure of test sections is stressed with good performance. The stresses not only be effectively controlled in the construction stage but also satisfy the original design requirements during the operation stage. The largest compressive stress is observed on the upper Trib of the upper part of the reinforced steel box girder section, and there are higher compressive stresses on the lower Urib in the lower part than those on the bottom plate and the lower Trib. The longitudinal stress can be effectively transmitted on the Trib and Urib of the reinforced steel box girder section. So that the stiffness transition is smooth, and the coordinated load bearing capacity is favorable in the steelconcrete joint section and adjacent sections of the girder. The finite element calculation results of steel plate stress and concrete stress, and the stress distribution laws are basically consistent with the actual field test results, which indicates that the finite element modeling and boundary conditions of the steelconcrete joint section are reasonable, and the numerical simulation on the stress state of the steelconcrete joint section and the adjacent sections are relatively accurate. 5 tabs, 13 figs, 29 refs.

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Last Update: 2021-09-30