高强钢绞线网-聚合物砂浆复合面层技术加固火灾受损梁效果

通过对钢筋混凝土(RC)梁构件进行受损前后的受弯性能加固实验研究,分析了实验构件的破坏形态、裂缝分布、荷载-挠度曲线、钢绞线的应变曲线以及极限承载力等.研究表明,普通RC梁在一般过火条件下,其抗弯承载力和刚度有一定程度的降低,而采用高强钢绞线网-聚合物砂浆复合面层加固技术(SMPM)加固后,其加固效果显著,承载力较过火梁显著提高,可恢复到其过火前的水平.

Effect of fire-damaged reinforced concrete beams strengthened with high-strength steel wire mesh and polymer mortar

The failure modes, fracture distributions, load-deflection curves, strain curves of strands and ultimate bearing capacities of reinforced concrete (RC) beams before and after being fire-damaged were analyzed on the basis of experimental studies on the bending properties of the beams. It is shown that the flexural capacity and stiffness of the fire-damaged beam reduce in some degree. After strengthening with high-strength steel wire mesh and polymer mortar (SMPM) the bearing capacity of the fire-damaged beam increases significantly and can reach the level of the RC beam before burning.