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Fatigue life gauge the performance testing of steel bridge fatigue life estimation

Author: LiFei
Tutor: RenWeiXin
School: Central South University
Course: Bridge and Tunnel Engineering
Keywords: Fatigue life gauge Alloy foil material Fatigue test Resistance cumulative Steel bridge Fatigue Life Estimation
CLC: U448.36
Type: Master's thesis
Year: 2007
Downloads: 318
Quote: 3
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Abstract


The fatigue life gauge resistance - fatigue response of memory components , its resistance value increases with fatigue course and automatically accumulated by the change of the resistance value for fatigue damage monitoring and fatigue life assessment of bridges and other large structures . In this paper, the fatigue life gauge sensing element of this new type of fatigue preliminary discussion of the steel bridges fatigue life estimation principle of fatigue life , the fatigue life of dollars preparation , performance testing and experimental calibration Finally, take advantage of the fatigue life gauge model steel bridge for fatigue damage monitoring and fatigue life assessment methods were discussed . The main contents are: 1. Detail the preparation method of the fatigue life gauge foil , including the alloy foil material , component design, the alloy melting method , the alloy foil material , cold rolling and heat treatment process . Description The method of production of fatigue life gauge foil , including the choice of the substrate material , the sensitive gate structure design , the method of making sensitive grid , the welding of the lead , and the final package . Few months 14MnNb bridge steel fatigue specimens experiment in fatigue life performance testing and calibration , including fatigue life gauge threshold load times and the relationship of the resistance change curve under constant amplitude loading complex amplitude loading equivalent to a constant amplitude loading methods . Explore the fatigue life gauge sensing element of this new type of fatigue monitoring of fatigue damage and fatigue life estimation of steel bridge , the main danger point strain spectrum to determine the strain spectrum on behalf of the fatigue life meter model equivalent SN curve life estimation of three steps . The strain spectrum measured by the Tsing Ma Bridge in Hong Kong , on behalf of the fatigue life model the life estimation , and were compared with the calculation results of the BS5400 , the results are in good agreement .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridges: the material points > Steel bridges and other metal bridge
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