Analysis on Fatigue Resistance of Shear Connectors of Orthotropic Steel-UHPC Composite Deck
Based on a major bridge,in this paper the finite element method is used to calculate the stress distribution characteristics and stress influence surface of the orthotropic steel UHPC composite deck in the steel box girder segment model of the bridge when the spacing of shear connectors in the transverse direction increases from 150 mm to 300 mm under the wheel axle load.Based on the rain flow method and Miner's fatigue damage accumulation theory,the equivalent stress amplitude and fatigue cumulative damage degree of the composite deck shear connectors under the design fatigue load are calculated.The results show that the fatigue resistance of the optimized shear connectors meets the requirements of the code.On this basis,the influence of the diameter and spacing of composite deck shear connectors on their fatigue performance is studied.The conclusions are as follows:(1)when the diameter of the stud shear connector increases from 13 mm to 19 mm,the stress amplitude and fatigue resistance of the shear connector are basically unchanged;and(2)the transverse spacing of shear connectors is increased from 300 mm to 600 mm,and the longitudinal spacing is changed from 200 mm to 400 mm.The stress amplitude is generally increased,but it still meets the requirements of fatigue resistance design within the design service life of the bridge.
bridge engineeringsteel-UHPC super light composite deckshear connectorsnumerical simulationfatigue performancestress amplitude
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