足尺重组竹受弯构件的试验与理论分析
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摘要
通过5个足尺重组竹受弯构件的试验与理论分析,详细研究了重组竹的抗弯性能。研究表明,重组竹受弯构件的典型破坏形态是底部竹纤维拉断和中性轴附近层间剪切破坏,重组竹受弯构件的设计由截面刚度控制,对应挠度限值L/250的荷载值PL/250与极限荷载Pmax的比值有较好的稳定性,通过回归建立了重组竹抗弯强度fm与弹性模量E的相关关系模型,弹性模量表达的刚度能够准确预测承载力;对于重组竹受弯构件,平截面假定依然成立;参考木结构设计计算方法,考虑竹材重组竹的材料特性,给出了重组竹受弯构件的计算方法,初步建议了重组竹抗弯强度设计值、顺纹抗剪强度设计值、弹性模量E的设计指标。
The bending tests and theoretical analysis of five full-scale bamboo scrimber components were conducted and the flexural behavior of bamboo scrimber was researched in detail.Results show that the typical failure modes of bamboo scrimber flexural components are the bamboo fiber fracture at the bottom and interlaminar shear failure near the neutral axis.The sectional stiffness control the design for the bamboo scrimber flexural components,the ratio of PL/250 of the load corresponding to the deflection limit value of L/250 and ultimate load Pmaxhas good stability.The relationship model of bending tensile strength fm and elastic modulus E was established by regression,which shows that the sectional stiffness expressed by the elastic modulus could predict the bearing capacity well.The plane-section assumption is still valid.The bamboo calculation methods of scrimber flexural components were proposed considering the materials properties of bamboo scrimber based on wood structure design methods.The design value of bamboo bending strength,shear strength parallel to grain and the elastic modulus E were presented preliminarily.
The bending tests and theoretical analysis of five full-scale bamboo scrimber components were conducted and the flexural behavior of bamboo scrimber was researched in detail.Results show that the typical failure modes of bamboo scrimber flexural components are the bamboo fiber fracture at the bottom and interlaminar shear failure near the neutral axis.The sectional stiffness control the design for the bamboo scrimber flexural components,the ratio of PL/250 of the load corresponding to the deflection limit value of L/250 and ultimate load Pmaxhas good stability.The relationship model of bending tensile strength fm and elastic modulus E was established by regression,which shows that the sectional stiffness expressed by the elastic modulus could predict the bearing capacity well.The plane-section assumption is still valid.The bamboo calculation methods of scrimber flexural components were proposed considering the materials properties of bamboo scrimber based on wood structure design methods.The design value of bamboo bending strength,shear strength parallel to grain and the elastic modulus E were presented preliminarily.
引文
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[3]Lugt V,Dobbelsteen V,Janssen J.An environmental,eco-nomic and practical assessment of bamboo as a building materialfor supporting structures[J].Construction and Building Materi-als,2006,20(9):648-656.
[4]YU Dongwei,TAN Hongwei,RUAN Yingjun.A future bam-boo-structure residential building prototype in China:Life cycleassessment of energy use and carbon emission[J].Energy andBuildings,2011,43(10):2638-2646.
[5]de Flander K,Rovers R.One laminated bamboo-frame houseper hectare per year[J].Construction and Building Materials,2009,23(1):210-218.
[6]Albermani F,Goh G Y,Chan S L.Lightweight bamboo doublelayer grid system[J].Engineering Structures,2007,29(7):1499-1506.
[7]陈绪和,王正.竹胶合梁制造及在建筑中的应用[J].世界竹藤通讯,2005,3(3):18-20.CHEN Xuhe,WANG Zheng.Bamboo based panels for struc-tural application[J].World Bamboo and Rattan,2005,3(3):18-20.(in Chinese)
[8]肖岩,佘立永,单波,等.现代竹结构在汶川地震灾后重建中的应用[J].自然灾害学报,2009,18(3):14-18.XIAO Yan,SHE Liyong,SHAN Bo.Application of modernbamboo struture to reconstruction after Wenchuan earthguake[J].Journal of Natural Disasters,2005,3(3):18-20.
[9]Xiao Yan,Zhou Quan,Shan Bo.Design and Construction ofModern Bamboo Bridges[J].Journal of Bridge Engineering,ASCE,2010,15(5):533-541.
[10]Wei Y,Jiang S X,Lv Q F,et al.Flexural Performance ofGlued Laminated Bamboo Beams[J].Advanced Materials Re-search,2011,168-170:1700-1703.
[11]魏洋,吕清芳,张齐升,等.现代竹结构抗震安居房的设计与施工[J].施工技术,2009,38(11):52-55.WEI Yang,LYU Qingfang,ZHANG Qisheng,et al.Designand construction of the modern bamboo anti-seismic living room[J].Construction Technology,2009,38(11):52-55.
[12]蒋身学,张齐生,傅万四,等.竹材重组材高频加热胶合成型压机研制及应用[J].林业科技开发,2011,25(3):109-111.JIANG Shenxue,ZHANG Qisheng,FU Wansi,et al.Develop-ment and application of high-frequency heating molding press forparallel bamboo sliver lumber[J].China Forestry Science andTechnology,2011,25(3):109-111.
[13]魏洋,蒋身学,李国芬,等.FRP筋增强竹梁的力学性能试验研究[J].工业建筑,2009,39(S1):327-331.WEI Yang,JIANG Shenxue,LI Guofen,et al.Experimentalstudy on mechanical properties of bamboo beams reinforced withFRP bars[J].Industrial Construction,2009,39(S1):327-331.
[14]中华人民共和国国家标准.木结构设计规范(GB50005—2003)[S].北京:中国建筑工业出版社,2003.Chinese National Standards.Code for design of timber struc-tures(GB 50005—2003)[S].Beijing,China Architecture andBuilding Press,2003.
[15]中华人民共和国国家标准.建筑结构可靠度设计统一标准(GB50068—2001)[S].北京:中国建筑工业出版社,2001.Chinese National Standards.Unified standard for reliability de-sign of building structures(GB 50068—2001)[S].Beijing,Chi-na Architecture&Building Press,2001.
[16]潘景龙,祝恩淳.木结构设计原理[M].北京:中国建筑工业出版社,2009.PAN Jinglong,ZHU Enchun.Wood structural design principle[M].Beijing:China Architecture&Building Press,2009.
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