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介绍提高受压钢构件抗弯性能的加固方法,砂浆填充FRP管套在钢构件外侧,管端采用FRP织物包裹。对18个双向轴对称截面试件进行三轴压缩试验,得到试件的荷载-应变曲线和失效模式,证实其承载能力和延性得到了提高。对试件钢骨截面、长细比及端部包裹FRP织物层的影响进行了研究。结果表明,加固后,失效模式从由于整体屈曲引起的钢构件中部屈服转变为钢构件端部的局部损伤;因此,试件的承载能力提高了44%～215%,延性增加高达877%。细分模型用于加固构件的计算,由此计算出的承载能力与试验结果相符。
The reinforcement method to improve the flexural strength of the steel members under compression is introduced. The mortar filled FRP pipe is sheathed on the outside of the steel member and the pipe end is wrapped by FRP fabric. Triaxial compression tests were carried out on 18 specimens of biaxial axisymmetric sections, and the load-strain curves and failure modes of the specimens were obtained. The results show that the bearing capacity and ductility have been improved. The effects of the steel section, the slenderness ratio and the FRP fabric layer wrapped on the ends were studied. The results show that the failure modes change from the yielding in the middle of the steel member to the local damage in the end of the steel member due to the integral buckling. Therefore, the carrying capacity of the specimen increases by 44% ~ 215% and the ductility by as much as 877%. The subdivision model is used to calculate the reinforcement component, and the calculated load capacity is consistent with the test results.