非均匀锈蚀对建筑钢混组合梁承载力退化的影响分析

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中图分类号：TU375 文献标志码：A 文章编号：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

建筑钢混组合梁是以钢结构和混凝土结构为基础，构建的一种新型结构梁。（剩余5698字）