CFRP增强重组竹梁极限状态分析的非弹性模型
沈玉蓉1,2，黄东升1,2，周爱萍1,2，David Hui3
1.南京林业大学土木工程系，南京 210037；2.江苏省林业资源高效利用创新中心，南京 210037；3.美国新奥尔良大学机械工程系，LA 70148）
摘要：重组竹（PSB）是一种竹基复合材料，越来越多地用于制造建筑结构中的横梁和立柱。然而，与钢筋混凝土（RC）梁相比，由于相对较低的抗拉强度和刚度，重组竹弯曲构件的跨度通常限制在5m以内。 为了提高重组竹弯曲构件的承载能力，本研究提出了纤维增强重组竹梁的计算方法。研究了碳纤维增强聚合物（CFRP）片材增强重组竹梁的弯曲性能。通过4点弯曲实验研究了有和无CFRP加固的重组竹弯曲构件的失效模式。测试结果表明，重组竹梁的损坏呈现明显的非线性渐进过程。考虑到重组竹复合材料的非线性本构关系，建立了一个解析模型来估算CFRP增强重组竹梁的外观性能。结果表明，与未增强构件相比，CFRP加固梁的承载能力平均增加约27％。 该分析模型可以很好地预测CFRP加固重组竹梁的极限承载力和深度。
关键词：碳纤维；木材；机械性能；分析建模
An Inelastic Model for Ultimate State Analysis of CFRP Reinforced PSB Beams
Yurong Shen1,2； Dongsheng Huang 1,2 ；Aiping Zhou1,2； David Hui3
- 1.Department of Civil Engineering, Nanjing Forestry University, Nanjing 210037,China；2.Jiangsu Co-Innovative Center for Efficient Application of Forestry Resources, Nanjing 210037, China；3.Department of Mechanical Engineering, University of New Orleans, LA 70148, USA）
Abstract ：Parallel strand bamboo (PSB) is a bamboo-based composite which is increasingly used to fabricate beams and columns in building constructions. The span of PSB bending member, however, is usually limited in 5 m due to the relatively lower tensile strength and stiffness compared to reinforced concrete (RC) beams. In order to increase the load-carrying capacity of PSB bending members, fiber reinforced PSB beam stratagem was proposed in present study. Flexural performance of PSB beams reinforced with carbon fiber reinforced polymer (CFRP) sheets was studied. Failure modes of PSB bending members with and without CFRP reinforcement were studied by 4-point bending experiments. Test results revealed that the damage of PSB beams presents pronounced nonlinear progressive process. An analytical model, taking into consideration the nonlinear constitutive relation of PSB composite, was developed to estimate flexural performances of CFRP reinforced PSB beams. The results showed that load-carrying capacities of CFRP reinforced beams may averagely increase about 27% compared to unreinforced members. The analytical model can well predict the ultimate load-carrying capacities and deflections of CFRP reinforced PSB beams.
Keywords：Carbon fibre；Wood；Mechanical properties；Analytical modelling
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