Research on Time-variant Reliability of Main Cable in Suspension Bridge
During the service period of suspension bridge,due to long-term exposure to humid atmospheric environment,it is extremely vulnerable to atmospheric,wind and rain erosion,resulting in the degradation of the bearing capacity of the main cable,which will seriously affect the safety of bridge operation.It is necessary to evaluate the reliability of the main cable after corrosion.Taking a suspension bridge as the engineering example,this paper establishes the Midas Civil finite element calculation model,and obtains the load effect of main cable control section constant load and vehicle load.According to the failure mode of the main cable,the limit state equation is established,and the time-variant reliability index of the main cable control section is calculated when the annual average loss rate of the main cable resistance is 0.2%and 0.4%.The research shows that when the resistance of the main cable degrades rapidly,the reliability index of the main cable in operation for 80 years is lower than the standard value,and protective measures should be taken to reduce the corrosion degree of the main cable during operation in the design to prolong the service life of the main cable.
suspension bridgemain cabletime-variant reliability indexchecking point methodload effect
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