蜂窝梁残余应力试验

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中图分类号：TU391 文献标志码：A 文章编号：1000-582X（2025）09-093-11

Abstract：Castellated beams areanew type of structural member fabricated by cuting the webofan I-section or H-sectionmember along with the polygonal lines and then welding the upper and lower halves together. Compared to the traditional solid-web beams，castelated beams exhibit theadvantages ofahigh strength-to-weight ratio， high in-plane stiffness，and economic eficiency.Due to the increased depth and the presence of openings， castellated beams are more susceptible to buckling.Studies have shown that the distribution of residual stresses across the section significantly influences their overall stability behavior. In this study，the residual stress distribution of two solid beams，four beams with low-height web plates，and four castellated beam specimens was measured using thesectioning method to investigate the influence of the cutingand weldingprocesses on the residual stresses in thecastellatedbeam sections.Testresults indicate thatthe shape of the flange residual stress distributionremains largelyunchangedafter cutingand welding，but the tensile residual stress at theflange-web junction increases significantly，and itcanachieve the yield strength after welding.The webcut region in the shallow and deep web specimens exhibit high levels of tensile residual stress.The residual stressdistribution in the T-section ofcastellated beams is similar to that of the short and deep web specimens，while the web post sectionincastellted beams exhibits changes due to welding，with tensile residual stresses reaching yield strength at the welds.Based on the analysis of test results and existing models，a simplified model forlongitudinal residual stress distribution was proposed for castellated beams，which could provide a reference for the stability analysis and design of castellated beams.

Keywords：castellated beams;cutting;welding;residual stress; distribution model

蜂窝梁是通过对热轧工字形或H形截面构件的腹板沿特定折线切割后错位焊接而成的空腹构件，具有材料利用率高、经济性好、施工便利性强等特点，在民用建筑、工业设施结构中得到广泛应用[]。（剩余9510字）