竹集成材-H型钢-竹集成材组合梁受弯性能

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中图分类号：S784 文献标志码：A

Abstract：【Objective】Toinvestigatetheefectsoftension-zonebamboothicknessandboltdiameteronthefexuralperformanceof bamboo-steelcompositebeamsandproposesamethodforcalculatingtheirultimatebearingcapacity.【Method】Sixboltedbamboo steel composite beams to L6） were designed and tested under four-point bending to analyze failure modes，load-deflection curves， interfaceslipandheight-straindistribution.【Result】Compositebeamswithbamboointhecompressionzoneexhibitedductile failurewithoutmaterialrupture，whereasbeamswithbambooinbothcomprsionandsionzoes（ambostelbamboocoposite beams）showedvaryingdegreesofbamboofracture.Bothbamtypesdisplayedelasticandplasticphases，butbamboo-steel-bamboo beamsaproachednea-elasticbehavior.Althoughindividualbambooandsteecomponentsadheredtotheplane-sectionassuption， thecompositesystemdeviatedduetosignificantinterfaceslip.Compositeinteractionweakenedwithincreasingtension-zonebamboo thicknes，butwasenhancedtosomeextentwiththeincreaseofboltdiameterInterfaceslipintensifiedwiththickertension-zone bamboo，andslipvalues between tensionandcompressionzones graduallyconverged.Increasingbolt diameterfroml2to 14mm improvedbendingcapacityby 8.9% .Theultimate bearingcapacitieswith tension-zonebamboo thicknesses of20，40，60，and 80mm were improved by 33.3% 50.1% 70.9% and 80.1% ，respectively， compared to the beams without bamboo in the tension zone;however， theextentofimprovementdmshdastethicknsoftetesio-oebambooapproacedthatoftecompresio-oe.ical predictions of ultimate bearing capacity closely aligned with experimental results （error <5% ）.【Conclusion】Bamboo-steel-bamboo compositebeamssignificantlyoutperformcompresion-zoneonlybambo-stelbeamsinbothload-bearingcapacityandstifes. Largerbolt diameters improveinterfaceconstraintsandcompositesynergyThisresearchprovides criticaldesignguideliesand theoretical foundations for engineering applications of bamboo-steel hybrid structures.

Keywords：bamboo-stee-bamboocompositebeam;four-pointbendingtest;fexuralapacity;bamboothickness;boltdameter

随着可持续发展理念推动建筑行业向低碳化转型，竹材作为可再生资源，凭借固碳能力强、力学性能好等特性，正逐步替代钢材、混凝土等传统建材。（剩余14565字）