Abstract:There are the insufficient bearing capacity,inadequate operational space,and structural aging of the old approach bridge in Luojing port area.To achieve scientific decision-making for the renovation scheme,we build a quantitative evaluation system with 5 primary indicators(progress,cost,safety,quality,environmental protection) and 13 secondary indicators by the analytic hierarchy process(AHP).After experts built judgment matrices by the 1-5 scaling method and passed consistency checking,we identify cost and progress as core evaluation dimensions,and quantitatively compare three schemes including scheme 1(adding piers to reduce span to 13.5 m with existing piles),scheme 2(supplementing piles to maintain 27 m span),and scheme 3(full demolition and reconstruction of a 40 m approach bridge).The results show scheme 1 scored highest(4.16/5),outperforming scheme 2(3.58) and scheme 3(2.45),with 20% lower direct costs and 30% shorter construction period.Although scheme 1 reduces flood discharge section,optimizing pile layout and anti-collision measures mitigate flood impacts.AHP can effectively solve the problem of multi-objective decision-making,providing a replicable quantitative framework for port approach bridge renovation and referencing similar projects.
