CFRP增强铝合金组合杆件的受力性能与设计方法

Mechanical Behavior and Design Methodology of CFRP Strengthened Aluminium Members

铝合金和CFRP(碳纤维增强复合材料)都具有轻质、耐腐性强、无磁性等优点,将两者组合应用于结构中既能发挥出它们共同的优势,又能相互弥补各自不足。本文以轴心受力为主的杆系空间结构为背景,对圆管截面和方管截面的CFRP增强铝合金构件的受力性能进行了系统的试验研究,包括18个短管轴压试验,15个长管轴压稳定试验和6个弯曲试验。基于试验进行了理论分析,提出了基于铝合金名义屈服强度的组合构件轴心受压承载力计算公式和组合管局部屈曲承载力计算公式;并提出了组合构件抗弯刚度的计算方法;还比较了多个计算模型,建议了组合长管轴压稳定承载力的计算方法。这些设计计算方法,为合理应用CFRP增强铝合金组合构件建造大跨空间结构提供了设计依据。

Light weight, anti corrosive and nonmagnetic are the common advantages of aluminium and CFRP （carbon fiber rein forced polymer）. It can make their advantages more effective and cure their shortages each other to combine them together as a structural member. CFRP strengthened aluminium hybrid pipes and square tubes, which are to be used as axial loaded members in spatial structures, are investigated by a series of experiments and theoretical analysis on 18 axial compressed short columns,15 axial compressed long columns and 6 flexural specimens. Based on the results of the analysis of the tests,the formulae of the axial compressive strength of the hybrid members is presented,which is related to the nominal yield strength. And the formula for the local buckling strength and the flexural stiffness are also proposed. By comparing the existed approaches, an approach to determine the stability factors of hybrid member is proposed. All above as the methodology on the the design of CFRP strengthened aluminium hybrid members for longspan spatial structures is established.