中图分类号：S781.9 文献标志码：A 文章编号：1673-923X（2025）07-0156-08

Mechanical performance of laminated bamboo lumber - bamboo plywood nailed connections loaded monotonically

CHENGuo12，YING Feifei1， ZHANG Peng1， CHENFengcheng¹，YINMingyang1 （1.Collegeoinsti7a;b MaterialsandStructuralTechnologyofBambooamp;WoodEngineringResearchCenter，Nanjing210o37，iangsu，China）

Abstract：【Objective】Inviewofthedeficienciesoftraditional woodtrusses interms ofbearingcapacityand theirpropensity to collapseetirelyhendamaged，anewtypeoflaminatedbamboolumber （LBL）trussisproposed.TheLBLtrussusesBLforboththe chordsandwebmembers，withachmemberconnectedbynailedbambooplywood（BP）Thejoint，asthecriticalpartbetweearious members，playadirectoleintestabilitydoad-beagcapacityofteru.I-deptheseachintothmechanicalproperofBBPnail joints under monotonic loading isofpositivesignfcance forthepromotionandaplicationofLBLtrusses.【Method】Taking the angle θ betweentheloadand the principalaxisoftheBPasaparameter，destructivetests wereconductedon6pureshear，2 sheartension，and12shear-compresionspecimens toexploretheirfailuremechanismsandmechanicalbehaviors.【Result】Theresults indicatedthat tefluremodesoftespecimensicudedBPplatefracturs，nailpeetrationthroughtheBPplate，localio failureof theBPplateunderthenailad，and“double-hinge”failureofthenails.Tefilureofpureshearandshear-tensionjoints primarilymanifestedasBPplatefracturesand“double-hinge”failureofthenails，whiletheshear-compresionspecimensmainly exhibited“double-inge”failureoftenailsInsomespecimens，theailheadswereembeddedintorpenetratedthroughteBPplate. Theultimatebearingcapacityofthepureshearspecimensisidepedentofteangle.Teultimateloadsofthshear-tensiopemens at the same angle were allhigher than those of the shear-compression specimens.For a difference of 90^∘ in angle θ ，the bearing capacity ofthespecimensisessentiallthsame.Theload-displacementcurvesdonotshowaclearyieldpoint.Theyieldloadestimatedbythe 5% naildiameteroetmetodisoeinineithtectaliaiondteHassaemoelanettefcteoad-dsplacent constitutiverelationshipofthejointsatvariousstagesofoading.【Conclusion】Thefailure mechanismofthenailedonectionshas benrevealeddrincityutilitydsenesigeddspactsiioe proposed.These findings provide design basis and reference for the application of bamboo trusses.

Keywords：bmbo;lamatedbooumbersilotionodaringapacityoad-dspacemetosiieel

竹子生长速度快，成熟周期仅需 3～6a ，是一种极具潜力的可再生资源[1。然而，原竹壁薄中空，受生长环境影响很大，导致其物理和力学性能参数存在显著的差异。这种性能的差异性对原竹在工程领域中的应用提出了巨大的挑战，尤其是在标准化和质量控制方面[2-5]。竹集成材（Laminatedbamboolumber，LBL）是一种新兴的工程竹产品，首先将竹筒沿纵向劈开，去除竹青和竹黄后刨削成定宽、定厚的矩形截面竹片，干燥至 8%～12% 含水率后用胶黏剂将其黏合，最后经热压、砂光等工序加工而成[6-10]。LBL克服了原竹存在的缺陷，开发利用LBL结构材，有助于增加碳汇和保护生态环境，对于实现“双碳”目标具有重要意义。

木桁架广泛应用于国内外木结构建筑的楼（屋）盖系统中，腹杆和弦杆常见的连接方式包括螺栓和金属齿板。已有研究表明[12-13]，节点往往相较其他部位更易发生破坏，进而给结构安全带来严重的不利影响，轻则变形过大，重则整体垮塌。学者们提出“以竹代木”，旨在减少对木材的依赖[14-16]。Xiao等[17]研究了螺栓连接竹桁架的力学性能，并将其成功应用于竹屋盖中。伍金梅等[18]提出一种胶合竹桁架，节点采用金属齿板连接。Li等[9]采用镀锌齿板作为LBL弦杆和腹杆的连接板。由于竹材硬度较大，部分板齿无法完全进入竹材内部，且板齿容易造成LBL发生纵向劈裂破坏。竹胶板（Bambooplywood，BP）是由竹篾（竹条）通过胶黏剂黏合而成的板材，上下相邻层的竹篾纤维垂直排列。这种排列方式极大分散了钉头进入BP板时产生的应力，从而降低了劈裂BP板的风险。……