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1、冷彎薄壁型鋼梁板組合樓蓋的受彎承載力研究－OSB周緒紅1，2喆1王瑞成3石宇1李(1．長(zhǎng)安大學(xué)，陜西西安710061;2．重慶大學(xué)，重慶400045;3．山西省電力勘測(cè)設(shè)計(jì)院，山西太原030000)摘要:通過(guò)對(duì)兩邊簡(jiǎn)支不同螺釘間距的兩塊足尺單跨冷彎薄壁型鋼梁-定向刨花板(OSB板)組合樓蓋的承載力進(jìn)行單調(diào)靜載試驗(yàn)，分析OSB板與冷彎薄壁型鋼梁連接的螺釘間距對(duì)組合樓蓋最大承載力的影響及試件的破壞機(jī)理。試驗(yàn)表明:冷彎薄壁型鋼梁-OSB板組合樓蓋具有較高的承載力和較小的變形;減小螺釘間距可以提高組合樓蓋的承載力。試件的破壞模式主要表現(xiàn)為樓蓋梁發(fā)生彎扭屈曲的同時(shí)，受壓
2、區(qū)翼緣、卷邊及腹板出現(xiàn)相關(guān)屈曲破壞，屈曲波長(zhǎng)為相鄰螺釘間距;支座附近OSB板與冷彎薄壁型鋼梁脫離、掀起破壞。采用考慮材料、幾何和接觸非線性的ANSYS有限元程序?qū)υ嚰M(jìn)行模擬，非線性有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好。在此基礎(chǔ)上，對(duì)螺釘間距、樓面板厚度、樓蓋梁間距、樓蓋梁截面厚度以及鋼材強(qiáng)度等影響因素進(jìn)行參數(shù)分析，結(jié)果表明:減小螺釘間距和樓蓋梁間距、增大樓面板和樓蓋梁截面厚度、提高鋼材的強(qiáng)度均可以提高組合樓蓋的承載力。關(guān)鍵詞:冷彎薄壁型鋼;定向刨花板;組合樓蓋;承載力;破壞模式中圖分類號(hào):TU398+．9文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000-131X(2013)09
3、-0001-11Studyonload-carryingcapacityofthecold-formedsteeljoists-OSBcompositefloorZhouXuhong1，2LiZhe1WangＲuicheng3ShiYu1(1．Chang’anUniversity，Xi’an710061，China;2．ChongqingUniversity，Chongqing400045，China;3．ShanxiElectricPowerExploration＆DesignInstitute，Taiyuan03000)Abstract:Twofullsc
4、alecold-formedsteeljoistsandOSB(Orientedstrandboard)compositefloors，whicharesinglespanandsimplysupportedonbothsides，weretestedbymonotonestaticloadingtostudytheinfluenceofscrewspacesontheultimatebearingcapacityandthefailuremodesofcompositefloorswereanalyzed．Theresearchshowsthatthecom
5、positefloorshavehighbearingcapacityandsmalldeformation．Theultimatebearingcapacitycanbeimprovedbyreducingthespacebetweenscrews．Themainfailuremodesarebending-torsionbucklingoffloorjoists，andtherelativelybucklingofcompressionflange，webandcrimping．Thewavelengthofbuckingisthedistancebetw
6、eenadjacentscrews．OSBisbrokeawayfromtheprofiledsteelsheetroundthesupportanddistortiondamageoffloorjoistspresentatthepositionconcentratedloadsacted．Consideringthematerial，geometryandcontractnonlinearity，themembersareanalyzedbyANSYSsoftwareandthenonlinearFEcalculationresultsagreewellw
7、iththetestresults．Furthermore，someparameters，suchasthespaceofscrews，orientedstandardboardthickness，steelthickness，spaceofthejoistsandthesteelmemberstrengthareanalyzed．Theanalysisresultsindicatethattheload-carryingcapacityofthecompositefloorcanbeincreasedbyreducingthespaceofscrewjois
8、tsandthethicknessof
