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Fatigue life assessment of large scale T-jointed steel truss bridge components

Fatigue life assessment of large scale T-jointed steel truss bridge components
Fatigue life assessment of large scale T-jointed steel truss bridge components
Among current approaches for fatigue strength assessment, the effective notch stress method is widely employed by practising engineers designing welded joints. This is particularly important in the situation where the nominal stress and structural stress cannot be easily quantified. In this paper, the applicability of the so called effective notch stress approach on large-size T-joints in truss bridges is investigated through a comprehensive experimental programme supported by numerical analysis. A series of large-scale fatigue tests on prototype large-size T-joints with cope holes were conducted. These types of joints are normally used in fully welded truss bridges. Furthermore, a simple parametric study was conducted using finite element analysis to investigate the effect of plate thickness and cope-hole radius on effective notch stress. Comparison of the results with commonly used design guidance documents reveals that the effective notch stress approach provides a conservative estimate of the fatigue strength of the specimens tested in this experimental programme.
Steel bridges, Welded joints, Fatigue, Cope holes, Notch Stress
0143-974X
499-509
Cai, Shunyao
8e4657a9-335e-4702-ba57-e03dff8ee1c0
Chen, Weizhen
9c884c12-d6a8-481e-8207-a1dcf0fa72a0
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Vardanega, Paul
d99630e2-75c5-472c-9f16-6377c8c76a3e
Taylor, Colin
e851d87b-d0ba-4d56-9670-57e154136604
Cai, Shunyao
8e4657a9-335e-4702-ba57-e03dff8ee1c0
Chen, Weizhen
9c884c12-d6a8-481e-8207-a1dcf0fa72a0
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Vardanega, Paul
d99630e2-75c5-472c-9f16-6377c8c76a3e
Taylor, Colin
e851d87b-d0ba-4d56-9670-57e154136604

Cai, Shunyao, Chen, Weizhen, Kashani, Mohammad, Vardanega, Paul and Taylor, Colin (2017) Fatigue life assessment of large scale T-jointed steel truss bridge components. Journal of Constructional Steel Research, 133, 499-509. (doi:10.1016/j.jcsr.2017.01.008).

Record type: Article

Abstract

Among current approaches for fatigue strength assessment, the effective notch stress method is widely employed by practising engineers designing welded joints. This is particularly important in the situation where the nominal stress and structural stress cannot be easily quantified. In this paper, the applicability of the so called effective notch stress approach on large-size T-joints in truss bridges is investigated through a comprehensive experimental programme supported by numerical analysis. A series of large-scale fatigue tests on prototype large-size T-joints with cope holes were conducted. These types of joints are normally used in fully welded truss bridges. Furthermore, a simple parametric study was conducted using finite element analysis to investigate the effect of plate thickness and cope-hole radius on effective notch stress. Comparison of the results with commonly used design guidance documents reveals that the effective notch stress approach provides a conservative estimate of the fatigue strength of the specimens tested in this experimental programme.

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Accepted/In Press date: 1 January 2017
e-pub ahead of print date: 14 March 2017
Published date: June 2017
Keywords: Steel bridges, Welded joints, Fatigue, Cope holes, Notch Stress
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 406731
URI: http://eprints.soton.ac.uk/id/eprint/406731
ISSN: 0143-974X
PURE UUID: 4c9ff8b4-d4e3-4053-89cd-8e895c43f91d
ORCID for Mohammad Kashani: ORCID iD orcid.org/0000-0003-0008-0007

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Date deposited: 21 Mar 2017 02:05
Last modified: 17 Dec 2019 01:27

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