FRP加固金属拉伸构件的性能分析

PERFORMANCE ANALYSIS OF TENSILE METALLIC MEMBERS STRENGTHENED WITH FRP

与传统的金属结构加固方法相比,粘贴纤维增强复合材料(FRP)加固具有明显的优势。FRP与金属构件之间的粘结应力会影响加固效果。根据平衡微分方程,对拉伸金属构件对称粘贴FRP加固后的复合构件进行应力分析,得到了剪应力沿复合构件厚度方向的分布,推导出FRP与金属构件之间的粘结应力,得到了FRP有效粘结长度的计算公式。通过碳纤维布双面加固钢板的静力拉伸试验,考察了碳纤维布与钢板之间的粘结应力分布,并对碳纤维布的有效粘结长度进行了分析。理论公式的计算结果与试验结果吻合较好,表明计算方法具有较高的精度。

Adhesively bonded fiber reinforced polymer （FRP） laminates for strengthening deteriorated metallic members demonstrate several advantages over traditional retrofit methods. The bonding stress between FRP and metallic members affects the load transfer and the effectiveness of strengthening. Based on the differential equations of force equilibrium, stress analysis of a tensile metallic member with double symmetric bonded FRP was conducted, and the distribution of the shear stress through the thickness of the repaired member was derived. The calculating formula of bonding stress between FRP and metallic member was derived and the effective bond length of FRP was obtained. Tests of steel plates with double symmetric bonded carbon fiber sheets were conducted under static loading. The shear stress between carbon fiber sheets and steel plate was considered. The effective bonded length of carbon fiber sheet was also analyzed. The computed results using these formulas were in good agreement with the experimental ones and the calculating methods were validated.