北美黄杉和云杉-松木-冷杉平行弦木桁架承载性能比较  

Comparative Study on Bearing Performance of Pseudotsuga menziesii and SPF(Spruce-Pine-Fir)Parallel Chord Wood Truss

作　　者：强明礼[1] 肖鹏[1] 袁哲[1] 苏艳炜[1] 朱浪 秦鑫悦 杜官本[1] Qiang Mingli;Xiao Peng;Yuan Zhe;Su Yanwei;Zhu Lang;Qin Xinyue;Du Guanben(Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry University,Kunming 650224;Kunming FREE WILL Furniture Manufacturing Co.,LTD,Kunming 650000)

机构地区：[1]西南林业大学云南省木材胶黏剂及胶合制品重点实验室,昆明650224 [2]昆明福莱威尔家具制造有限公司,昆明650000

出　　处：《林业科学》2024年第4期147-156,共10页Scientia Silvae Sinicae

基　　金：云南省重点研发专项(202402AE090027);江苏省科技厅苏北科技专项(SZ-SQ2021040);林业生物质资源高效利用技术国家地方联合工程研究中心开放基金(2023-GC02);云南省大学生双创训练计划项目(202126);高等学校学科创新引智计划(D21027)。

摘　　要：【目的】对比不同腹杆角度下北美黄杉和云杉-松木-冷杉(SPF)华伦式平行弦木桁架的承载性能,探究腹杆角度和结构用材对华伦式平行弦木桁架承载性能的影响规律,为平行弦木桁架结构设计提供理论依据。【方法】以承载力和稳定性为验算指标,利用Smsolver结构力学求解器对平行弦木桁架各杆件的内力变化及其变形情况进行定量分析,得到平行弦木桁架腹杆角度的上、下临界角度和最优腹杆角度;采用ABAQUS有限元软件对3种腹杆角度的北美黄杉和SPF平行弦木桁架进行有限元模型分析与验证,获得不同基材平行弦木桁架在不同腹杆角度情况下的内力变化规律,判断其可能的破坏形式和受力机理;以SPF和北美黄杉为基材分别制作3种腹杆角度的平行弦木桁架,进行抗弯承载性能静力试验,探究平行弦木桁架的极限荷载、应力分布及主要破坏形式,并与有限元模拟结果进行对比,验证平行弦木桁架有限元模型分析的准确性和适用性。【结果】1)华伦式平行弦木桁架的最优腹杆角度为47°,下临界角度为34°,上临界角度为60°;2)北美黄杉平行弦木桁架的极限荷载范围为26.53~40.83 kN,跨中挠度范围为30.57~31.01 mm,SPF平行弦木桁架的极限荷载范围为23.48~34.16 kN,跨中挠度范围为31.85~32.05 mm;3)腹杆角度34°、47°、60°的北美黄杉和SPF平行弦木桁架极限荷载分别为26.53和23.48 kN、35.10和30.06 kN、40.83和34.16 kN,对应跨中挠度分别为31.85和31.01 mm、30.72和32.05 mm、30.57和31.97 mm;4)北美黄杉平行弦木桁架的破坏形式主要表现为靠近桁架支座处的腹杆出现裂纹以及桁架端部或荷载施加点处齿板拔出,SPF平行弦木桁架的破坏形式主要表现为桁架端部和荷载施加点处齿板拔出;5)ABAQUS有限元模拟和试验验证发现,2种平行弦木桁架跨中处弦杆轴力最大,往两边逐次递减,桁架跨中处腹杆轴力最小,往两边逐次�【Objective】The bearing performance of Pseudotsuga menziesii and SPF(spruce-pine-fir)parallel chord wood trusses under different web angles was compared to explore the influence of web angles and structural materials on the bearing performance of wood trusses,providing theoretical basis for the structural design of parallel chord wood trusses.【Method】Using Smsolver structural mechanics solver,the internal force variation and deformation of each member of parallel chord wooden truss were quantitatively analyzed with bearing capacity and stability as checking indexes,and the upper and lower critical values and optimal web angles values of parallel chord wooden truss were obtained.ABAQUS finite element software was used to analyze and verify the finite element models of Pseudotsuga menziesii and SPF parallel chord wooden trusses with three different web angles.The internal force variation rule of the parallel chord wood trusses with different base materials under different web angles was obtained,and the possible failure mode and stress mechanism were determined.On this basis,with Pseudotsuga menziesii and SPF as base material,respectively,making three web angle parallel chord wood truss,bearing capacity for bending static test,explore parallel chord wood truss of the ultimate load,stress distribution and the main failure mode,and is contrasted with the results of finite element simulation,to verify the exactness of the parallel chord wood truss finite element model analysis and applicability.【Result】1)The optimal web angle of the warren type parallel chord wooden trusses was 47°,the critical value of the lower limit web angle was 34°,and the upper limit web angle was 60°.2)The ultimate load range of Pseudotsuga menziesii parallel chord wooden trusses was 26.53−40.83 kN and the mid-span deflection range was 30.57−31.01 mm.The ultimate load range of the SPF parallel chord wooden trusses was 23.48−34.16 kN and the mid-span deflection range was 31.85−32.05 mm.3)The ultimate load of Pseudotsuga men

关 键 词：平行弦木桁架 北美黄杉 云杉-松木-冷杉 腹杆角度 承载性能 ABAQUS有限元模拟 

分 类 号：S781.2[农业科学—木材科学与技术]