The study investigated the strengthening effect of glass fiber and polypropylene fiber-based engineered cementitious composites (GFPPECC) on fire-damaged reinforced concrete short exterior columns. Both moderate (500 °C) and high (900 °C) intensities of fire load corresponding to the ISO834 fire curve were adopted. A total of 15 columns (150 mm × 150 mm × 1000 mm) were cast. The columns were grouped as control column (CC), unstrengthened column-(C2, C3), and strengthened column-(C1, C4) with three columns in each group. The columns in group CC were subjected to axial compression up to failure and kept as the standard reference. The columns in the group (C2, C4) and (C1, C3) were fired up to 900 °C and 500 °C, respectively. Compressive loading on C2 and C3 was applied without any strengthening technique. C1 and C4 were repaired and strengthened using GFPPECC. A similar group of columns, namely unstrengthened-(A-C2, A-C3) and strengthened-(A-C1, A-C4) columns, were analyzed numerically using ANSYS. The parametric analysis was carried out from experimental and numerical results. Variations between experimental and numerical results were negligible. The strengthening has restored to about 68% of the stiffness of columns damaged due to moderate fire intensity. The energy absorption, ductility, and modulus of elasticity were also good, with only about less than 10% reduction compared to the control column. The performance of columns shows that the GFPPECC composite was utilized effectively without any debonding. Whereas for high fire intensity, the GFPPECC composite was not fully used, and premature failure has occurred due to the softening of concrete at high temperatures.

该研究研究了玻璃纤维和聚丙烯纤维基工程胶结复合材料（GFPPECC）对受损的钢筋混凝土短外柱的加固效果。均采用了与ISO834火曲线相对应的中等强度（500°C）和较高强度（900°C）的火荷载。共铸造15根柱（150 mm×150 mm×1000 mm）。将这些柱分为对照柱（CC），未加强柱（C2，C3）和加强柱（C1，C4），每组三列。CC组中的柱承受轴向压缩直至破坏，并保留为标准参考。（C2，C4）和（C1，C3）组中的色谱柱分别被加热到900°C和500°C。在没有任何加强技术的情况下，对C2和C3施加了压缩载荷。C1和C4使用GFPPECC修复和增强。使用ANSYS对一组相似的色谱柱进行了分析，即未增强的（A-C2，A-C3）和增强的（A-C1，A-C4）柱。从实验和数值结果进行参数分析。实验结果与数值结果之间的差异可以忽略不计。由于中等强度的火势，加固已恢复到损坏圆柱的刚度的68％。能量吸收，延展性和弹性模量也很好，与对照柱相比仅降低了约不到10％。色谱柱的性能表明，GFPPECC复合材料得到了有效利用，没有任何脱键现象。鉴于高火强度，GFPPECC复合材料并未得到充分利用，