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  • 1
    Electronic Resource
    Electronic Resource
    Hot Spot Stress Analysis of Fatigue for Tsing Ma Bridge Critical Members under Traffic Using Finite Element Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 925-928 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The suspension bridge has more flexibility and repetitive vehicles produce stress cyclesin members. Then fatigue of the member is accumulated with the daily traffic loadings. In order toevaluate the working condition of the Tsing Ma Bridge, the online monitoring health system hasbeen installed in long suspension bridge. The location of the strain sensor is not exactly at thecritical member locations. The hot spot stress analysis for critical members is necessary for accuratefatigue evaluation of the bridge. The global finite element analysis of the Tsing Ma Bridge undertraffic loading is performed to determine the critical fatigue member locations. A detailed localfinite element analysis for the welded connections is performed to determine the hot spot stress ofcritical fatigue location. As a case for study, the calculated stress concentration factor is combinedwith the nominal representative stress block cycle to obtain the representative hot spot stress rangecycle block under traffic loading from online health monitoring system. The comparison resultshows that the nominal stress approach cannot consider the most critical stress of the fatiguedamage location and the hot spot stress approach is more appropriate for fatigue evaluation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.925.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fully Coupled Fatigue Damage Analysis of Welded Steel Bridge Member under TrafficLoading (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 761-764 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The finite element analysis fully coupled fatigue damage evolution is implemented onthe user subroutine UMAT of the finite element software ABAQUS. The fully coupled methoddeveloped with damage mechanics and the finite element analysis is performed on calculation offatigue damage accumulation of the critical welded member in the Tsing Ma Bridge. The calculatedresult shows that the fatigue damage in the critical welded member is accumulated in the region oftoe of welding. The value of faitgue life calculated by the fully coupled method is smaller than thatby the uncoupled method, which suggests that there exists interaction between the fatigue damageevolution and the structural response. The linear Miner’s Law is widely used however conservativefor the evaluation of fatigue life of bridge on service. The above results provide feasible method foraccurate evaluation of fatigue damage in bridge components based on the hot spot stress analysisand the damage mechanics theory
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.761.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fatigue Damage Accumulation of Welded Bridge Member during Crack Growth Propagation with Initial Crack (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 24-27 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The crack growth behavior and the fatigue life of welded members with initial crack inbridges under traffic loading were investigated. Based on existed fatigue experiment results ofwelded members with initial crack and the fatigue experiment result of welded bridge memberunder constant stress cycle, the crack keeps semi-elliptical shape with variable ratio of a/c duringcrack propagation. The calculated method of the stress intensity factor necessary for welded bridgemember crack propagation was discussed. The crack remained semi-elliptical shape with variableratio of a/c during crack propagation. The fatigue crack propagation law suitable for welded steelbridge member fatigue crack propagation analysis was deduced based on the continuum damagemechanics and fracture mechanics. The proposed fatigue crack growth model was then applied tocalculate the crack growth and the fatigue life of existed welded member with fatigue experimentalresult. The calculated and measured fatigue life was generally in good agreement, at suitable initialconditions of cracking, for welded member widely used in steel bridges
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.24.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Fatigue Damage Analysis on Crack Growth and Fatigue Life of Welded Bridge Members with Initial Crack (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 251-254 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The behavior of crack growth with a view to fatigue damage accumulation on the tip ofcracks is discussed. Fatigue life of welded components with initial crack in bridges under trafficloading is investigated. The study is presented in two parts. Firstly, a new model of fatigue crackgrowth for welded bridge member under traffic loading is presented. And the calculate method ofthe stress intensity factor necessary for evaluation of the fatigue life of welded bridge members withcracks is discussed. Based on the concept of continuum damage accumulated on the tip of fatiguecracks, the fatigue damage law suitable for steel bridge member under traffic loading is modified toconsider the crack growth. The proposed fatigue crack growth can describe the relationship betweenthe cracking count rate and the effective stress intensity factor. The proposed fatigue crack growthmodel is then applied to calculate the crack growth and the fatigue life of two types of weldedcomponents with fatigue experimental results. The stress intensity factors are modified by the factorof geometric shape for the welded components in order to reflect the influence of the welding typeand geometry on the stress intensity factor. The calculated and measured fatigue lives are generallyin good agreement, at some of the initial conditions of cracking, for a welded component widelyused in steel bridges
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.251.pdf
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