Simplified safety appraisal based on frequency measurements for simply-supported steel girder bridge in service

A simplified safety appraisal method of simply-supported steel girder bridge in service is proposed.Firstly,premises of safety appraisal method of steel bridge in service are discussed and '10-Segment Model' suiteble to actual inspecting engineering is presented.Then dimensionless frequency variation functions of local damage based on '10-Segment Model' are presented by contrasting former linear functions of that and Fi-Sk curves are analyzed by ANSYS and fitted by Origin for practice.Safety-appraisal indexes are introduced and formulations of them on two circumstances are derived.At last procedures of simplified safety appraisal are summarized and an example of numerical simulation is illustrated to verify the method.