林业工程学报2017，Vol.2Issue(3)：137-142,6.DOI:10.13360/j.issn.2096-1359.2017.03.022
碳纤维增强重组竹受弯构件的极限承载力试验
Experiment study on ultimate load-bearing capacity of carbon fiber reinforced polymer reinforced parallel bamboo beam
摘要
Abstract
Parallel strand bamboo (PSB) is a bamboo-based and fiber reinforced anisotropic composite which is increasingly used to fabricate beams and columns in building constructions.It is difficult for PSB to meet the needs of modem building structures with a large span.On the other hand,carbon fiber reinforced polymer (CFRP) is often used for enhancing and strengthening bamboo and wood structural member because of its lightweight.The CFRP pasted in convex side of PSB beams may fully utilize the compressive performances of this material and increase the load-carrying capacity of the member.The results of previous studies showed that the tensile constitutive law had linearity in parallel-to-grain direction,and the failure mode was brittle failure.However,its compressive constitutive law of PSB has obvious nonlinearity,and the failure mode is ductile failure.Therefore,the analysis on ultimate load-bearing capacity of CFRP reinforced PSB beams need to adopt the nonlinear model.The flexural performance of PSB beams reinforced with CFRP sheets was investigated in this study.Mechanical performances and failure mode of PSB bending members with and without CFRP reinforcement were studied by using 4-point bending experiments.Test results indicated that the damage of PSB beams presented pronounced nonlinear progressive process,and the load-carrying capacities of CFRP reinforced PSB beams could be obviously improved.However,the effect of enhancement on its stiffness was not obvious on account of not making the best of the strength of CFRP.An analytical model,taking into consideration the nonlinear constitutive relation of PSB composite,was developed to estimate the flexural performances of CFRP reinforced PSB beams.It was found that the load-bearing capacities of two-layer CFRP reinforced PSB beams averagely increased by about 27％ when compared with the unreinforced menbers,and experimental resuits verified the validity of developed model.关键词
碳纤维增强聚合物(CFRP)/重组竹/力学性能/力学模型Key words
carbon fiber reinforced polymer (CFRP)/parallel strand bamboo (PSB)/mechanical properties/mechanical model分类
建筑与水利引用本文复制引用
周爱萍,刘睿,沈玉蓉,张苏鹏,于浩然,袁吉,李航..碳纤维增强重组竹受弯构件的极限承载力试验[J].林业工程学报,2017,2(3):137-142,6.基金项目
国家自然科学基金(51578291) （51578291）
林业科学技术成果国家级推广项目([2015] 21号) （[2015] 21号）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
江苏省大学生创新创业训练计划项目(201510298049Z). （201510298049Z）
