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将碳纤维复合材料(CFRP)薄板粘结在圆形中空截面(CHS)钢管表面是一种提高截面结构性能的新方法。CFRP薄板用于钢管截面加固,设计时需了解其对钢材圆形截面的限制能力。该文给出了用CFRP加固CHS钢管抗弯能力的估算方法。CFRP箍环对管壁的约束能够减少局部纵弯失稳的影响。设计时将CFRP箍环的弹性模量作为纵向CFRP弹性模量的一部分,以此考虑CFRP箍环的影响。纵向CFRP将管壁的局部纵弯失稳的影响降至最低,最终增加钢管的局部抗弯刚度和强度。对现有设计准则,尤其是AS/NZS4600(2005),AS4100(1998)和EC3中所包含的加固影响参数进行了讨论。考虑了不同CFRP数量、纤维箍环弹性模量和钢材屈服强度对加固的影响。采用CFRP-CHS钢管的强度曲线和参数类型来描述其强度提高程度。
Bonding carbon fiber composite (CFRP) sheets to round hollow section (CHS) steel surfaces is a new way to improve the cross-sectional structural properties. CFRP sheet for steel cross-section reinforcement, the design needs to know its circular cross-section of the ability to limit the steel. This paper gives an estimation method of the flexural capacity of CFRP strengthened CHS steel tube. The constraint of the CFRP hoops on the pipe wall can reduce the influence of local buckling instability. The design of the CFRP hoop elastic modulus as part of the longitudinal CFRP elastic modulus, in order to consider the impact of CFRP hoop. Longitudinal CFRP will be the wall of the local longitudinal buckling of the impact of instability to a minimum, and ultimately increase the local bending stiffness of steel and strength. Existing design guidelines are discussed, in particular, for reinforcement effects included in AS / NZS 4600 (2005), AS4100 (1998) and EC3. The influence of different CFRP quantity, fiber hoop ring elastic modulus and steel yield strength on the reinforcement is considered. The strength curves and parameter types of CFRP-CHS steel pipes are used to describe the strength improvement.