为了提高竹梁受拉区的竹纤维受力能力,将浸渍纤维布(FRP)配置于竹梁的受拉区,利用纤维布良好的抗拉性能,增强竹梁的抗弯力学性能。为研究纤维增强竹梁的抗弯性能,对4种纤维增强竹梁与未增强竹梁进行弯曲对比试验,研究纤维类型、纤维层数等对竹梁弯曲性能的影响。研究结果表明:纤维增强竹梁的整体增强效果明显,其抗弯承载力与刚度得到有效提高。纤维增强竹梁的抗弯承载力较未增强竹梁提高30.16%～52.44%,对应正常使用极限状态挠度限值时的截面刚度提高9.73%～12.89%。由于浸渍胶流失的原因,玄武岩纤维对竹梁承载力增强效果好于碳纤维,而碳纤维的弹性模量较大,对竹梁截面刚度提高效果较好。纤维增强竹梁的截面应变发展规律证实了纤维材料在竹梁承载中的增强作用。
Abstract
In order to improve the stress of bamboo fibers in the tension zone, preimpregnated fiber sheets(fiber-reinforced polymer, FRP)were placed in the tension zone of bamboo beams, in which the good tensile properties of FRP was utilized to enhance the flexural performance of bamboo beams. Five bamboo beams were tested under flexural loading to investigate the mechanical behavior for FRP reinforced beams, in which one control bamboo beam and four FRP-reinforced bamboo beams were involved. The main parameters include the types and layers of FRP. Test results indicate that FRP can improve significantly flexural performance of bamboo beams, in which the flexural bearing capacity and the stiffness are effectively enhanced. Comparing with the control bamboo beam, the load-carrying capacities and the cross-sectional stiffness of the FRP-reinforced bamboo beams increase by 30.16%-52.44% and 9.73%-12.89%, respectively. Due to the loss of adhesive, basalt fiber has better strengthening effect in bearing capacity, while carbon fiber has better strengthening effect in cross-sectional stiffness for higher elastic modulus. Moreover, the strain profiles demonstrate the strengthening roles of FRP in bamboo beams.
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基金
收稿日期:2013-04-22 修回日期:2013-07-10
基金项目:国家自然科学基金项目(51208262,51078076); 教育部博士点基金项目(20103204120007); 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:魏洋,副教授,博士。E-mail: wy78@njfu.edu.cn。
引文格式:魏洋,骆雪妮,周梦倩. 纤维增强竹梁抗弯力学性能研究[J]. 南京林业大学学报:自然科学版,2014,38(2):11-15.
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