非均勻銹蝕對建筑鋼混組合梁承載力退化的影響分析

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中圖分類號：TU375 文獻標志碼：A 文章編號：1005-8249（2025）03-0164-05

DOI：10.19860/j.cnki.issn1005-8249.2025.03.029

Abstract：Inorder totimelyobtaintheperformance degradationof steel-concretecompositebeams innon-uniformcorrosion environments，thisarticleconducts experimentalanalysis.Byanalyzingtheinfluenceofnon-uniformcorosiondepthonthe effectivecross-sectionofcompositebeams，therelationshipbetweenthecorosionthicknessandcorosionrateoftheentire circumferenceandsemicircleofcompositebeams isdetermined，andafiniteelement modelofcompositebeams isconstructed. Design corrosion rates of 5% ， 10% ，and 20% respectively，and simulate and analyze the changes in bearing capacity of compositebeamspecimensunderloadloading.Theresultsshowedthatthestrengthyieldratio，ductilityratio，andshear bearing capacityof thespecimensinthenon corodedstateremainedatahigh level，andthemidspandisplacement， compresive strainof theconcrete topplate，andtensile strainofthesteelbeambottmplateof thespecimensremained low. Thehigherthecorrosionrate，the weakerthe bearing capacityof the specimen.Themid spandisplacement，compresive strain of theconcretetopplate，andtensilestrainofthesteelbeambottomplateof thespecimenwithahighercorosionrate ncrease significantly，andtheyieldstrengthof thespecimenissignificantlylowerthanthatofthenoncorodedspecimen.Therefore， non-uniform corosionhas asignificant negative impactontheperformanceof steel-concretecomposite beams in buildings.

Key words：heterogeneouscorrosion；steel concretecomposite beam；bearing capacity；corrosionrate；strong yield ratio; mid span displacement; top plate compressive strain； floor tension strain

0 引言

建筑鋼混組合梁是以鋼結構和混凝土結構為基礎，構建的一種新型結構梁。（剩余5698字）