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页数:10页
时间:2018-12-12
《拱形张弦胶合木梁结构受力性能试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、建筑结构学报JournalofBuildingStructures第35卷第5期2014年5月014Vol.35No.5May2014文章编号:1000-6869(2014)05-0104-10拱形张弦胶合木梁结构受力性能试验研究张晋1,许清风2,张鸣1,蔡建国1,马树伟1(1.东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096;2.上海市工程结构新技术重点实验室,上海200032)摘要:为研究拱形张弦胶合木梁结构的受力性能和破坏形态,进行了5榀张弦胶合花旗松木梁的张拉试验,活荷载全跨、活荷载半跨布置基本组合
2、加载试验,以及活荷载全跨布置下极限承载力试验,分析试件关键点的位移、应变和拉索内力,观测了试件的破坏模式。结果表明:张拉试验中拱形木梁反拱值主要取决于拱跨比和初始预拉力。全跨活荷载加载试验中,跨中最大挠度达到木梁跨度的1/250~1/330。在张弦木梁的承载力试验中,跨中受拉区发生脆性劈断之前,跨中位移和应变与加载点荷载基本呈线性关系,跨中最大位移达到木梁跨度的1/60~1/70,花旗松的屈服压应变约为0.5%,极限拉应变约为0.45%;木梁在整体破坏时,跨中最大挠度达到木梁跨度的1/41~1/45,极限压应变约为0.9%,表现
3、出一定的塑性性能;提高拱跨比或垂跨比,均能适当提高拱形木梁的承载力;增大木梁截面积对木梁承载力的提高幅度不大。关键词:张弦胶合木梁结构;拱形木梁;预应力;静力试验;全跨活荷载;半跨活荷载;承载力;受力性能中图分类号:TU366.2TU317.1文献标志码:AExperimentalresearchonmechanicalperformanceofarchedglulambeamstringstructureZHANGJin1,XUQingfeng2,ZHAHGMing1,CAIJianguo1,MAShuwei1(1.KeyLa
4、boratoryofConcreteandPrestressedConcreteStructuresofChinaMinistryEducation,SoutheastUniversity,Nanjing210096,China;2.ShanghaiKeyLaboratoryofNewTechnologyResearchonEngineeringStructure,Shanghai200032,China)Abstract:Inordertoinvestigatethemechanicalpropertiesandfailure
5、modes,fivespecimensofDouglasfirglulambeamstringstructureweretensionedandtested.Thetestsinvolvedfull-spanloadingtests,half-spanloadingtestsandtheultimatebearingcapacitytestsunderthefull-spanload.Behaviorofthespecimens,includingdisplacements,strains,cableforcesandfailu
6、remodesetc.,weremeasuredandanalyzed.Itisshownthatthereverseddeformationofarchinthetensioningprocessisdeterminedmainlybythearchspanratioandtheinitialprestressingforce.Underthefull-spanliveload,themidspandeflectionisbetween1/250and1/330ofthespan.Theultimatebearingcapac
7、ityexperimentindicatesthatbeforethebrittlesplitoccursatthemidspantensilearea,themidspandeflectionandstrainsarelinearlyrelatedtotheload.Andthemaximummidspandeflectionisbetween1/60and1/70ofthespan.TheyieldcompressivestrainofDouglasfirisabout0.5%andtheultimatetensilestr
8、ainisabout0.45%.Themidspandeflectionisbetween1/41and1/45ofthespanwhenthespecimenisdestroyed.Theultimatecompressivestrainisabout0.9%
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